Event calendar file
3-11 July 2007
Merida, Mexico
Mexico/General timezone
- icrc2007@icrc2007.unam.mx
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Recent discoveries in gamma ray astronomy at a few 100GeV provide many motivations
for extending our coverage of the gamma ray sky to higher energies, up to several
100TeV. After reviewing these motivations we will present simulation-based
considerations to drive the design of arrays of Atmospheric Cherenkov telescopes to
obtain relevant sensitivity from a few TeV to a few 100TeV.
Presented by Dr. Stephan LEBOHEC, Dr. Pierre COLIN
on
9 Jul 2007
at
14:45
The proposal of a new 4th generation of the Front-End with the advanced 1st
level triggers for the Infill Array of the Pierre Auger Observatory and for the
Auger North is described. Newest FPGA chips offer much higher capacity of logic
registers and memories, as well as DSP blocks. The calibration channel,
previously supported by an external dual-port RAM, has been fully implemented
into
... More
Presented by Dr. Zbigniew SZADKOWSKI
on
6 Jul 2007
at
14:45
The Cygnus arm of the galaxy contains a large number of
energetic astrophysical sources, including numerous
supernova remnants (SNRs), pulsar wind nebulae (PWN) and
X-ray binary systems. Indeed, in terms of potential
galactic sources needed to explain the origin of the
high energy cosmic rays, Cygnus is the promising region
accessible to northern hemisphere observatories using
the air s
... More
Presented by Prof. Rene ONG
on
4 Jul 2007
at
10:54
Hadron induced, very inclined EAS, starting their development early
in the atmosphere produce narrow, relatively flat muonic fronts on
the Pierre Auger detection level. The signatures of FADC traces
(very short rise time with fast exponential attenuation) from water
Cherenkov tanks can be used for their detection. Currently used
triggers in the Pierre Auger surface detector (Threshold an
... More
Presented by Dr. Zbigniew SZADKOWSKI
on
6 Jul 2007
at
14:45
Based on a large series (N=14038) of daily solar-wind densities, we obtained
the fluctuation power spectrum. The spectrum shows that the 399-day variation
(the synodic period of Jupiter) has the largest amplitude in the interval of
periods from 20 to 800 day. It is second in magnitude only to the secular, 22-
,and 11-year variations. The amplitudes of the 399-day variations in solar-wind
... More
Presented by Dr. Vladislav TIMOFEEV
on
4 Jul 2007
at
14:45
A method to reconstruct the 3-dimensional structure of extensive air showers,
seen by fluorescence detectors, is described.
The observation of the shower is done in 2-dimensional pixels, for consecutive
time bins. Time corresponds to a third dimension. Assuming that the cosmic ray
shower propagates as a plane wave front moving at the speed of light, a
complex 3D volume in space can be ass
... More
Presented by Prof. Mario PIMENTA, Dr. Sofia ANDRINGA
on
6 Jul 2007
at
14:45
A proximity focusing Cherenkov imager called CHERCAM (CHERenkov CAMera) has been
added to the Cosmic Ray Energetics and Mass (CREAM) instrument for its forthcoming
balloon flight in Antarctica. The detector is optimized for charge measurements with
nearly constant resolution over the range of nuclear charge between Z = 1 and about
26 (Fe). The Cherenkov radiator is a 108 x108 cm2 plane of two
... More
Presented by Dr. Michel BUÉNERD
on
4 Jul 2007
at
14:45
We study the dependence of the exponent of the power law rigidity spectrum
of the galactic cosmic ray (GCR) intensity variations on the range of the GCR
particles rigidity using data of neutron monitors and ground meson telescopes.
We found that the rigidity spectrum of the GCR intensity variations is hard for
neutron monitors with the effective rigidities ~10-15GV and soft for neutron
m
... More
Presented by Dr. Krzysztof ISKRA, Prof. Michael ALANIA
on
9 Jul 2007
at
14:45
A design concept for a future ground-based cosmic-ray observatory using the Direct
Cerenkov technique will be presented. This technique can provide high precision,
largely model-independent, measurements of the energy and charge of heavy cosmic-ray
primaries in the region of the knee. It does so by exploiting the direct component
of Cerenkov radiation emitted by these primaries prior to thei
... More
Presented by Prof. Scott WAKELY
on
6 Jul 2007
at
13:05
A Fabry-Perot interferometer prototype is studied, as part of a Doppler LIDAR
(DL) receiver, for determining the aerosol to molecular scattering ratio for use
in EAS Fluorescence Detectors. The etalon of this instrument has a Free
Spectral Range of 0.1 cm[-1] and resolution in wavenumber 0.04 cm[-1] .
Possible additional use of the proposed DL receiver can be as a spectrally
selective d
... More
Presented by Mr. Emmanuel FOKITIS
on
6 Jul 2007
at
14:45
As described in an accompanying paper (kasahara), full M.C simulation of air showers in the GZK region is
possible by a distributed-parallel processing method. However, this still needs a long computation time even
with ~50 to ~100 cpu's which may be available in many pc cluster environments. Air showers always fluctuate
event to event largely, and only 1 or few events are not app
... More
Presented by Prof. katsuaki kasahara KASAHARA
on
6 Jul 2007
at
14:45
Analysis of various data accumulated in X-ray emulsion chamber experiments,
especially, data on gamma-ray–hadron families with unusual characteristics
(Centauros, aligned events etc.), requires a comprehensive program to simulate the
propagation of electromagnetic and various-type hadron particles through
sandwich-like media of emulsion chambers as well as measuring procedures used for
emul
... More
Presented by Prof. Rauf MUKHAMEDSHIN
on
6 Jul 2007
at
14:45
Some aspects of the cosmic ray astronomy require the access and the
processing of the data in the shortest possible time. We implemented a data
files moving system , based on GRID tools and services, to automatically
transfer the files from the high altitude ARGO-Yangbajing Laboratory in Tibet to
the Storage Elements at the processing sites in IHEP-Beijing (China) and CNAF-
Bologna (Italy
... More
Presented by Cristian STANESCU
on
6 Jul 2007
at
14:45
Geant4 is a Monte Carlo radiation transport toolkit of generalized application in
areas such as high-energy physics, nuclear physics, astroparticle physics, or medical
physics.
Geant4 provides an optical physics process category, allowing the simulation of the
production and propagation of light. Such capabilities are well tailored for the
simulation of optics systems namely in cosmic-rays e
... More
Presented by Dr. Bernardo TOMÉ
on
9 Jul 2007
at
14:45
Here we present the results of a harmonic analysis of the large scale
cosmic ray anisotropy as observed by the Milagro observatory. The Milagro
observatory is a water Cherenkov detector located in the Jemez mountains
outside of Los Alamos, New Mexico. With a high duty cycle
and large field-of-view, Milagro is an excellent instrument for measuring
this anisotropy with high sensitivity at TeV e
... More
Presented by Mr. Brian KOLTERMAN
on
9 Jul 2007
at
14:45
The Track Imaging Cerenkov Experiment (TrICE) is an air Cerenkov telescope
designed to use multi-anode photomultipliers to achieve a high angular
resolution for measuring cosmic-ray composition at TeV-PeV energies. The
TrICE camera, composed of 16 Hamamatsu R8900 16-channel multi-anode
photomultiplier tubes achieves 0.086 degree pixel spacing over 1.5 degree field
of view. We present
... More
Presented by Dr. Karen BYRUM
on
4 Jul 2007
at
14:45
A LED flasher has been developed for TUNKA-133 EAS Cherenkov detector. Blue
ultra bright InGaN LED is used as a light source in the flasher. The flasher's
driver based on a complementary pair of fast RF transistors. The light yield of
the flasher is adjusted in a wide range from 0 to upt to 10**9 photons per
pulse. The results of studies of the flasher's amplitude and timing parameters
a
... More
Presented by Mr. Bator SHAIBONOV
on
6 Jul 2007
at
14:45
The energy of the primary cosmic ray can be calculated from fluorescence
photons detected by fluorescence telescope. However, since we can not know
the true energy of primary cosmic ray, it is difficult to calibrate between
number of photons and energy directly. In TA project, we will create pseudo-
cosmic ray events by using accelerated electron beam which is injected in
the air. The injecte
... More
Presented by Tatsunobu SHIBATA
on
6 Jul 2007
at
14:45
Ground Level Enhancements (GLE) are more likely to occur when the Sun is
very active. The most recent GLE was a maverick. It occurred near solar
minimum, but it was a large event by historical standards, with a peak increase
exceeding 100% at some stations. This talk reports initial observations and
modeling of the GLE of December 13, 2006 based on data returned by
the “Spaceship Earth
... More
Presented by Prof. John BIEBER
on
6 Jul 2007
at
12:05
High energetic neutrinos coming from space can interact either in the atmosphere
or in the Earth. In the first scenario neutrino may initiate extensive air showers
(EAS) in the atmosphere, but due to their very small interaction cross section in air
only very inclined EAS might be detectable by large detectors. In the second scenario
neutrino may interact inside the Earth and prod
... More
Presented by Dr. Dariusz GORA
on
10 Jul 2007
at
12:17
In an air shower induced by a cosmic ray, due to the high velocities, most of
the particles are concentrated in the relatively thin shower front, which, for
obvious reasons, is called the 'pancake'. This pancake, which for the present
discussion is assumed to be charge neutral, contains large numbers of electrons
and positrons. It has a typical thickness of a few meters and is moving to the
s
... More
Presented by Olaf SCHOLTEN
on
6 Jul 2007
at
14:45
Ultra High Energy Cosmic Rays (UHECRs) have an energy many times
greater than that of particles accelerated in colliders. The
Extended Air Showers (EAS) resulting from their interaction in the
atmosphere give us the opportunity to study not only Cosmic Rays but
also these extremely energetic cascades.
A method to calculate the Average Longitudinal Shower profile has been
applied to the Hig
... More
Presented by Mr. Gareth HUGHES
on
4 Jul 2007
at
09:42
The diffuse extragalactic gamma-ray background (EGRB) has been derived by various
groups from observations by the EGRET instrument on CGRO. The derived
EGRB consists of gamma-rays that may come from true astrophysical components, such
as from unresolved extragalactic point sources (blazars, normal galaxies, etc.) and
truly diffuse signals from the Galaxy and inverse Compton scattering on the s
... More
Presented by Dr. Troy PORTER
on
6 Jul 2007
at
14:45
The first phase experiment of the Tibet hybrid experiment to measure the energy
spectrum of the light components (proton and helium) strongly suggested that the knee
region should be dominated by heavy components. A new type of air shower core
detector Tibet-YAC (Yangbajing Air shower Core detector) as well as Tibet-MD (a large
underground muon detector array) are being planned. In this paper,
... More
Presented by Dr. Jing HUANG
on
4 Jul 2007
at
14:45
The EGRET experiment onboard the Compton Gamma-ray Observatory have provided
the most precise measurements of the gamma-ray sky to date. EGRET measurements of
diffuse emission across the sky show an excess above 1 GeV. This “GeV excess” has
been a topic of great debate and interest since its original discovery by Hunter et al. in
1997. We have modified the GLAST simulation and recons
... More
Presented by Prof. Robert JOHNSON
on
6 Jul 2007
at
14:45
Milagro is a TeV gamma-ray detector that
utilizes a large water Cherenkov detector to observe extensive air
showers produced by high energy particles impacting the Earth's
atmosphere. Milagro's distinct advantage compared to other TeV
gamma-ray detectors is that it views a wide field (2 steradian
over-head sky) and it continuously operates (>90% live time). A new
background rejection techniq
... More
Presented by Dr. Aous ABDO
on
9 Jul 2007
at
14:45
We developed a new parallel processing method enabling full M.C EAS simulation (say, with minimum energy of
500 keV) without using thin sampling even at 10^19 eV. Normally, distributed-parallel processing needs a
specific software and programs must be organized to match with such system. During the computation such a
scheme also requires complex communications among many computer hosts
... More
Presented by Prof. katsuaki kasahara KASAHARA
on
6 Jul 2007
at
14:45
Referring to the observed data in the depletions of elements in the interstellar
clouds, the chemical composition of dust grains has been deduced, though it is highly
variable among these clouds. This variability seems to reflect upon the place where
such dust grains are formed inside these clouds. Deep inside the clouds, the chemical
composition of dust grains is well coincident with that of
... More
Presented by Dr. Kunitomo SAKURAI
on
4 Jul 2007
at
12:53
A probability density method for VHE gamma-ray source analysis, applicable to both
stand alone IAC telescopes and stereoscopic arrays, is presented here. Developed
using simulations and Crab data for the Whipple 10m telescope, the technique covers
both two-dimensional image and spectral analyses, and background subtraction is
implemented either by a modified standard approach using cuts on Hil
... More
Presented by Ms. Alex SYSON
on
9 Jul 2007
at
14:45
Detection of radiopulses from moon's surface employing moon based as well
as earth based detectors was proposed about several decades back. Inspired
by this novel idea a good number of experimental groups have been continuing
such investigations. In this paper a moon based experimental set up for
receiving lunar radiopulses and then transmitting the same to earth based or
satellite base
... More
Presented by Ms. Kalpana ROY SINHA
on
9 Jul 2007
at
14:45
We searched for gamma-ray sources in the EGRET data from cycle 1 to cycle 9. We used
a 2D maximum likelihood method similar to that developed for the Egret 3EG catalog.
Two interstellar background models, due to cosmic-ray interactions in the Milky Way,
were used: a model where the most recent HI, CO, and inverse Compton maps were
linearly fitted to the EGRET gamma rays and a model obtained fr
... More
Presented by Mr. Jean-Marc CASANDJIAN
on
4 Jul 2007
at
08:30
Gamma-ray bursts (GRBs) have been detected up to GeV energies and are
predicted by many models to emit in the very high energy (VHE, >100 GeV)
regime too. Detection of such emission would allow us to constrain GRB
models. Since its launch, in late 2004, the Swift satellite has been
locating GRBs at a rate of approximately 100 per year. The rapid
localization and follow-up in many wavelengths
... More
Presented by Dr. Brenda DINGUS
on
10 Jul 2007
at
09:30
The Vela Supernova remnant is a large, nearby remnant with a complex morphology,
containing a bright pulsar at its centre. This pulsar has an associated pulsar wind
nebula (PWN), gamma-ray emission from which was detected by the H.E.S.S.
collaboration at very high energies. As the Vela remnant is the closest known PWN to
us, detailed study of the spectral and morphological characteristics of t
... More
Presented by Dr. Bruno KHELIFI
on
6 Jul 2007
at
14:45
We have investigated a solar activity dependence
of a solar wind (SW) effect on cosmic ray intensity (CRI) variations.
The SW effect discussed here is not concerned with transient origins
such as Forbush decreases nor with known solar modulations.
The effect is represented by the regression coefficient
of CRI variations with SW velocities.
CRI data we used have been recorded by the neutron m
... More
Presented by Prof. Hiroshi KOJIMA
on
9 Jul 2007
at
14:45
A spectacular outburst of VHE (>100 GeV) gamma-ray emission
was observed from PKS 2155-304 in 2006 with the H.E.S.S. experiment.
The VHE flux reached levels of ~20 times the Crab Nebula flux,
more that 2 orders of magnitude above typical values
observed from the object. This extremely high flux,
when coupled with the sensitivity of H.E.S.S.,
enables temporal studies of the emission
wit
... More
Presented by Dr. Wystan BENBOW
on
6 Jul 2007
at
12:17
Interplanetary coronal mass ejections, the interplanetary counterparts of coronal
mass ejections at the Sun, are the major drivers of interplanetary shocks in the
heliosphere, and are associated with modulations of the galactic cosmic ray
intensity, both short term (Forbush decreases caused by the passage of the shock,
post-shock sheath, and ICME) and possibly with longer term modulation. Usi
... More
Presented by Dr. Hilary CANE
on
5 Jul 2007
at
12:41
Milagro is a TeV gamma-ray observatory with a ~2 sr field of view and a >90% duty
factor. A recent survey at 12 TeV of the Galactic Plane by Milagro has discovered
three new sources, along with four promising source candidates. Each of the new
sources and most of the candidates have likely counterparts in the EGRET GeV catalog,
some of which are possibly associated with pulsar wind nebulae (
... More
Presented by Gary WALKER
on
6 Jul 2007
at
14:45
Since the discovery of TeV emission from the LS 5039/RX J1826.2-1450 binary system, microquasars are an
established class of Very High Energy gamma-ray sources. Nonetheless, the current catalog of gamma-ray binaries
remains somewhat limited, with only three examples known. We present the results of a systematic search for TeV
emission from known X-ray binaries with similar properties to LS 5
... More
Presented by Mr. Hugh DICKINSON
on
6 Jul 2007
at
14:45
The existing imaging air Cherenkov Telescopes (IACT) are using
imaging cameras of aperture 2-4 degrees. These telescopes
have F/0.7 to F/1.2 optics. The best optical resolution that one
can obtain with these optical designs is in the range of 3 minutes
of arc, and that only in the central region of the imaging camera.
There are indications from simulations that one can further improve
th
... More
Presented by Dr. Razmick MIRZOYAN
on
6 Jul 2007
at
14:45
We discuss the general observational upper limits on the total annihilation rate of
dark matter derived from the diffuse gamma ray background measured by the EGRET
satellitr. We assume that the dark matter annihilates at tree level in the least
detectable final states in the Standard Model, namely neutrinos. Any other decay
channel would lead to stronger constraints. Electroweak jet cascading
... More
Presented by Dr. Pasquale Dario SERPICO
on
10 Jul 2007
at
08:54
The KASCADE-Grande experiment at Forschungszentrum Karlsruhe, Germany,
measures extensive air showers initiated by primary particles with energies
between 100 TeV and 1 EeV. Detector pulses digitized by a Flash-ADC based
data acquisition system were unfolded to study the arrival times of secondary
particles separately for the electromagnetic and the muonic shower component.
Muons arrive on av
... More
Presented by Dr. Paul DOLL
on
4 Jul 2007
at
14:45
Deconvolution algorithms have been used successfully for
optimization/restoration/deblurring of astronomical images in a variety of
wavelengths, especially in the optical band (e.g., for HST). We present here an
iterative Richardson-Lucy type method designed for treatment of images
obtained with the High Energy Stereoscopy System (H.E.S.S.) array of ground-
based gamma-ray telescopes. Its
... More
Presented by Dr. Gilles MAURIN
on
6 Jul 2007
at
14:45
For the design of an optical module for deep-sea cubic kilometre sized neutrino
telescopes it is important to optimise performance versus cost. In the
framework of the KM3NeT design study we have designed an optical module
consisting of a single glass pressure vessel and containing up to about 40 small
photomultiplier tubes 40 small photomultiplier tubes including their high-voltage
supp
... More
Presented by Prof. PAUL KOOIJMAN
on
9 Jul 2007
at
14:45
In the standard model of cosmic structure formation, dark matter haloes form by
gravitational instability. The process is hierarchical: smaller systems collapse
earlier, and later merge to form larger halos. The probability that a halo of mass m
at redshift z will be part of a larger halo of mass M at the present time is
described by the progenitor (conditional) mass function f(m,z|M,0), accor
... More
Presented by Dr. Lidia PIERI
on
9 Jul 2007
at
14:45
Since 2002, the number of detected blazars at gamma-ray energies of 100 GeV and above
has more than doubled. A synoptic study of these objects therefore might reveal
important collective characteristics. I present a study of all currently known
high-frequency peaked BL Lac-type objects for which photon energy spectra at E>100
GeV have been inferred. The intrinsic energy spectra of the sources
... More
Presented by Dr. Robert WAGNER
on
6 Jul 2007
at
14:45
We present the results of a kinetic calculation of the growth rates of
non resonant modes excited by streaming cosmic rays in
non-relativistic shock waves. We show how different assumptions for
the compensating current lead to the appearance of different modes
with different growth rates. We discuss the conditions under which the
modes are non resonant (a la Bell) and lead to large growth rat
... More
Presented by Dr. Pasquale BLASI
on
7 Jul 2007
at
08:30
To determine the characteristics of galactic and solar cosmic ray flux near Earth
by using neutron monitor measurements, the observation data are usually
submitted to analysis procedures involving extensive calculations and expert
knowledge. For space weather applications an equally valid method is desirable
that is straightforward, fast, and simple, to allow quasi-automatic data analysis
... More
Presented by Prof. Erwin O. FLUECKIGER
on
6 Jul 2007
at
11:42
Observations of the Coma cluster by Beppo-SAX have shown a hard X-ray excess in the
spectrum that could be interpreted as the presence of a particle acceleration site.
However, given that the hard X-ray instrument on board Beppo-SAX was non-imaging,
existence of point sources could change this interpretation. The better angular
resolution of INTEGRAL allowed us to analyze the morphology of the
... More
Presented by Mr. Dominique ECKERT
on
6 Jul 2007
at
14:45
We have designed and built a programmable hardware module for TTL pulse
generation and capture in absolute time. The time reference is an on-board GPS
(Global Positioning System) receiver. Tests of a prototype performed at the US
National Institute of Standards (NIST) found a nominal accuracy better than 20 ns
relative to the secondary US frequency standard. Potential applications for this
... More
Presented by Mr. Jeremy SMITH, Mr. Jason THOMAS, Mr. Stan THOMAS, Prof. Lawrence WIENCKE
on
6 Jul 2007
at
14:45
The IceCube neutrino detector is built into the Antarctic ice sheet at the South Pole to measure high energy
neutrinos. For this, 4800 PMTs are being deployed at depths between 1,450 and 2,450 meters into the ice to
measure neutrino induced charged particles like muons. IceTop is a surface air shower detector consisting of 160
Cherenkov ice tanks located on top of IceCube. To extend IceTop,
... More
Presented by Dr. Timo KARG
on
10 Jul 2007
at
12:53
The readout of optical modules for deep-sea kilometre sized neutrino
telescopes is challenging for many reasons. Power consumption of the
electronics placed at the bottom of the sea must be low, and the data have to
be transported to shore over distances up to possibly 100 km. We present a
novel readout system - developed in the framework of the KM3NeT design
study - where the data from
... More
Presented by Prof. PAUL KOOIJMAN
on
9 Jul 2007
at
14:45
Stimulated by the recent HESS galactic survey which discovered 14
new TeV gamma-ray sources, it is now important to measure 100 TeV
gamma rays from celetial sources to locate possible cosmic-ray
accelerators up to PeV energies in our galaxy.
The Tibet air shower array (37,000m**2), located at 4,300 m above
sea levelin Tibet, is a wide field-of-view gamma-ray telescope
above TeV energie
... More
Presented by Dr. Masato TAKITA
on
6 Jul 2007
at
14:45
Jets of Active Galactic Nuclei (AGN) are established emitters of Very High
Energy (VHE; >100 GeV) gamma rays. In addition, VHE radiation is expected to be emitted
from the vicinity of Supermassive Black Holes (SMBH) irrespective of their
activity state. Accreting SMBH rotate and generate a dipolar magnetic field. In the
magnetosphere of the spinning black hole acceleration
of particles can ta
... More
Presented by Ms. Giovanna PEDALETTI
on
6 Jul 2007
at
14:45
Utilising the unprecedented TeV sky coverage of the H.E.S.S. galactic plane scan, we present the results of a search
for Very High Energy gamma-ray sources coincident with the positions of known X-ray binaries. Although no
significant detections were obtained, upper limits to the TeV flux from 36 microquasars and X-ray binaries were
derived.
Presented by Mr. Hugh DICKINSON
on
6 Jul 2007
at
14:45
There are some prerequisites to possible success in searching for small-scale
anisotropy of cosmic ray arrival directions at the highest energies. Recent claims
of autocorrelations in the data of giant extensive air shower (EAS) arrays and
presumable correlations between BL Lacertae and ultra-high energy cosmic
rays (UHECRs) incite to sift the Yakutsk array data. Present analysis is based
... More
Presented by Dr. Anatoly IVANOV
on
7 Jul 2007
at
13:05
Current status and results of the experiment on recording
neutrino bursts are presented.
The observation livetime (since 1980) is 22.6 years.
The upper bound of collapse frequency in our Galaxy
is 0.10 $y^{-1}$ (90% CL).
Presented by Dr. Yuriy NOVOSELTSEV
on
5 Jul 2007
at
12:46
We present updated results for anisotropy searches in the direction of the
Galactic centre at energies in the EeV range. We use data from the Pierre
Auger Southern Observatory up to March, 2007. Present analyses are therefore
based on a substantially larger data set than our previous published results.
The larger statistics from the surface array allow for more precise measurements
as a
... More
Presented by Edivaldo SANTOS
on
4 Jul 2007
at
12:45
Problems in observation of extensive air showers generated by neutrinos are connected
with an extremely small cross section of inelastic collisions of neutrinos with
nuclei. However, two facts allow to search for showers generated by neutrinos: (1) a
hadron cascade with the primary energy of more than 10^13 eV leaves a mountain ridge
to the atmosphere from the depth ~ 300g/cm^2 without an esse
... More
Presented by Prof. Vera Georgievna SINITSYNA
on
9 Jul 2007
at
12:41
A shape of lateral distribution for charged particles in events with energy above
10**19eV is considered. Two methods were used for individual LDF parametrization. In
the first approach, the index of power was determined for generalized Greisen-Linsley
approximation. In second, mean square radius of the shower was determined for
approximation proposed by Lagutin et al. Comparison of resulted p
... More
Presented by Mr. Artem SABOUROV
on
4 Jul 2007
at
14:45
The discovery of direct evidence for the acceleration of high energetic particles at
the shell supernova remnant RXJ1713.7-3946 underlined the need to calculate the
cosmic ray (CR) distribution in the Galaxy on a spatial grid fine enough to resolve
the changes in the CR density due to these kind of objects. It was shown before by
Buesching et al 2005 that the discrete nature (both in space and
... More
Presented by Dr. Ingo BUESCHING
on
4 Jul 2007
at
14:45
We address the problem of determining the spectrum of night sky background
in a spectral resolution which allows understanding quick changes in the
intensity and shape of these spectra. One can use this information in EAS
observatories for carrying out possible corrective actions during the testing,
designing or normal operation phases.
We present a design of a low cost medium resolution
... More
Presented by Mr. Emmanuel FOKITIS
on
6 Jul 2007
at
14:45
The propagation of galactic and solar cosmic rays in the
solar wind (SW) can be strongly influenced by the SW
fluctuations properties. Magnetohydrodynamic (MHD) scale
fluctuations in the solar wind are usually highly
anisotropic, and have also been found to exhibit different
properties in regions of high and low solar wind speed.
We analyze here the anisotropy properties of the solar
wind f
... More
Presented by Dr. Sergio DASSO
on
10 Jul 2007
at
09:18
ACORDE (ALICE cosmic ray detector) is one of the ALICE
detectors, presently in construction. It will consist of an array of
plastic scintillator counters placed on the three upper faces of the
magnet. This array will act as the cosmic ray trigger for ALICE
calibration, as well as multiple muon trigger to study high energy
cosmic rays. ACORDE, together with other ALICE subdetectors,
will prov
... More
Presented by Dr. Arturo FERNANDEZ TELLEZ
on
5 Jul 2007
at
09:30
It is planned to up-grade the Pierre Auger Observatory through some enhancements so
that the energy spectrum of cosmic rays can be studied down to 0.1 EeV and the muon
component of showers can be determined. The former will lead to a spectrum measured
by one technique from 0.1 EeV to beyond 100 EeV while the latter will aid
identification of the primary particles. These enhancements consist o
... More
Presented by Prof. Alberto ETCHEGOYEN
on
6 Jul 2007
at
14:45
We present for the case of Tycho's supernova remnant the relation between the blast wave and contact
discontinuity sizes calculated within the nonlinear kinetic theory of cosmic ray acceleration in SNRs. It is
demonstrated that they are very well confirmed by recently published Chandra measurements, which show that
the observed contact discontinuity radius is so close to the shock radius, th
... More
Presented by Dr. Leonid KSENOFONTOV
on
6 Jul 2007
at
14:45
The ANtarctic Impulsive Transient Antenna (ANITA) searches for
ultra high energy neutrinos interacting in the antarctic ice cap.
It is a long duration balloon experiment composed of an array of
broadband dual-polarized horn antennas that had its first science
flight over Antarctica in December 2006 through January 2007. ANITA
relies upon the Askaryan effect, in which a particle shower
in a d
... More
Presented by Kimberly J. PALLADINO
on
7 Jul 2007
at
11:45
The ANTARES Collaboration is building a high energy neutrino telescope at 2500
m depth in the Mediterranean Sea. The experiment aims to search for high-
energy cosmic neutrinos through the detection of Cerenkov light induced by
muons and showers resulting from neutrino interactions with the surrounding
medium. The detector will consist of a three-dimensional array of 900 optical
modules h
... More
Presented by Dr. Yvonne BECHERINI
on
9 Jul 2007
at
14:45
The ARIANNA concept utilizes the Ross Ice Shelf near the coast of Antarctica
to increase the sensitivity to cosmogenic neutrinos by roughly an order of
magnitude when compared to the sensitivity of existing detectors and those
under construction. Therefore, ARIANNA can test a wide variety of scenarios
for GZK neutrino production, and probe for physics beyond the standard
model by measuri
... More
Presented by Prof. Steven BARWICK
on
7 Jul 2007
at
11:06
The characteristics relating to lateral and longitudinal development of EAS in the
energy region of 10**15 - 10**19 eV have been analyzed in the framework of the QGSJET
model and of mass composition of primary cosmic rays. It is found that at E0 >=
5x10**15 eV the mean mass composition of primary cosmic rays begins to vary as
indicated by a rise of <ln(A)> with increasing energy. The maximum
... More
Presented by Dr. Stanislav KNURENKO
on
6 Jul 2007
at
11:10
The transparency is one of the primary measures of the atmospheric state. The precise
long term series of atmospheric transparency measurements gives the possibility for
quantitative estimate of the variability of air circulation and to make climatologic
conclusions with regard to contamination, cloud formation, humidity and radiative
exchange. It seems to be possible to estimate the atmospher
... More
Presented by Dr. alexander MISHEV
on
6 Jul 2007
at
14:45
Using instruments on the ACE and Wind spacecraft, we investigate the temporal
evolution, spectrum, and ionization states of Solar Energetic Particle (SEP) Fe in
the impulsive event of 2000 May 1. Proton and electron intensities and anisotropies
were used to help constrain the characteristics of the interplanetary propagation
taking account of focusing, pitch-angle scattering, adiabatic decele
... More
Presented by Wolfgang DROEGE
on
4 Jul 2007
at
10:54
Acceleration of charge particles in stochastic electric fields is considered. The
fractional symmetric Fokker-Planck equation is derived on the basis of the
Langevin equations and with an assumption that the fluctuations of electric
fields are subordinated by the Levy stable laws. From the solution of the
equation it is showed that an ensemble of charge particles is relaxed to the
power
... More
Presented by Mr. Ivan ZIMOVETS
on
4 Jul 2007
at
14:45
Accuracies of numerical Fourier and Hankel transforms are examined with the
Takahasi-Mori theory of error evaluation. The higher Moliere terms both for
spatial and projected distributions derived by these methods agree very well
with those derived analytically. The methods will be valuable to solve other
transport problems concerning fast charged particles.
Presented by Prof. Takao NAKATSUKA
on
4 Jul 2007
at
14:45
Using data derived from the H.E.S.S. telescope system and the LIDAR facility on site,
a method of correcting for changing atmospheric quality based on cosmic-ray
parameters is presented. The method was applied to data from the active galactic
nucleus PKS 2155-304, taken during August and September 2004 when the quality of the
atmosphere at the site was highly variable. Corrected and uncorrect
... More
Presented by Dr. Paula CHADWICK
on
6 Jul 2007
at
14:45
Presented by Juan Carlos ROMERO-HICKS
on
3 Jul 2007
at
16:50
Presented by Simon SWORDY
on
3 Jul 2007
at
17:10
Presented by Juan Pedro LACLETTE
on
3 Jul 2007
at
16:40
Extreme Universe Space Observatory on JEM/EF (JEM-EUSO) is a space mission to observe extremely high-energy
cosmic rays. JEM-EUSO is a wide-angle refractive telescope in near-ultraviolet wavelength region to observe time-
resolved atmospheric fluorescence images of the extensive air showers from the International Space Station.
This paper will discuss the optical system of JEM-EUSO. We will r
... More
Presented by Yoshiyuki TAKIZAWA
on
6 Jul 2007
at
14:45
The fluorescence detection of ultra high energy ($\gtrsim 10^{18}$ eV) cosmic rays
requires a detailed knowledge of the fluorescence light emission from nitrogen
molecules, which are excited by the cosmic ray shower particles along their path in
the atmosphere. We have made a precise measurement of the fluorescence light spectrum
excited by MeV electrons in dry air. We measured the relative i
... More
Presented by Dr. Gonzalo RODRIGUEZ FERNANDEZ
on
10 Jul 2007
at
11:18
Air showers accompanied by high energy atmospheric families observed by Chacaltaya hybrid experiment
Characteristics of air-showers and accompanied high energy atmospheric families
detected in the hybrid experiment at Mt. Chacaltaya are studied in detail and
compared with those of simulations taking into accounts the specific detection bias
of the experiment. It is shown that the observed characteristics of the atmospheric
families accompanied by large air showers, Ne > 10^7, and also
those
... More
Presented by Dr. Masanobu TAMADA
on
9 Jul 2007
at
08:42
The Advanced Thin Ionization Calorimeter (ATIC), a balloon-borne experiment,
is designed to investigate the composition and energy spectra of cosmic rays of
charge Z = 1 to 26 over the energy range ~ 10^11 - ~ 10^14 eV. The
instrument consists of a silicon matrix charge detector, plastic scintillator strip
hodoscopes interleaved with graphite interaction targets, and an 18 radiation
leng
... More
Presented by Dr. Hoseok AHN
on
4 Jul 2007
at
14:45
Up to now, analyses of AMANDA data have been limited to searches for diffuse astrophysical sources, time-
integrated searches for point sources, and searches for flares and bursts from pre-selected sources (AGN and
GRB) over limited time-scales. On the other hand, multi-wavelength studies have shown that emissions can
occur in exponential flares or bursts with strengths that can be much great
... More
Presented by Dr. Rodín PORRATA
on
9 Jul 2007
at
14:45
We present the all-particle primary cosmic ray energy spectrum obtained by a
parametric event-by-event determination of the primary energy. The results are
obtained on the basis of an expanded experimental data from the GAMMA
experiment. The method was developed using the CORSIKA EAS simulation
code with the SYBILL interaction model and taking into account the response of
the GAMMA detec
... More
Presented by Dr. R.M. MARTIROSOV
on
6 Jul 2007
at
08:30
The study of the arrival direction of Ultra High Energy Cosmic Rays UHECRs
potentially gives us an insight on their origin. In this poster we present a search
for event structures in the sky in which the arrival direction of the events lie on a
great circle (the arc structure) in High Resolution Fly?s Eye (HiRes). The arc
structure is expected when charged cosmic rays get deflected while pa
... More
Presented by Prof. Charlie JUI
on
4 Jul 2007
at
14:45
Milagro is a TeV gamma-ray observatory with a ~2 sr field of view and a >90% duty
factor. The large field of view and long observation time make Milagro ideal for
surveying large regions of the Northern Hemisphere sky. A previous all-sky survey
searched for point sources (Atkins, R, et al., 2004, ApJ, 608, 680-685), but the
analysis is easily adaptable to look for intermediate-scale (~10 deg
... More
Presented by Gary WALKER
on
4 Jul 2007
at
09:30
We analyze the muon-like Events(single ring image ) in the Super-Kamiokande
(SK) by the Computer Numerical Experiment. Assuming the parameters of the
neutrino oscillation obtained by the SK which characterize the type of the
neutrino oscillation, we reproduce the zenith angle distribution of the muon-like
events and compare it with the real distribution obtained by the SK . Also, we
car
... More
Presented by Prof. Eiichi KONISHI
on
9 Jul 2007
at
14:45
Measuring the cosmic gamma ray flux at super-GZK energies is of significance in both
interpreting the GZK effect and putting constraints on exotic models of the origin of
ultrahigh energy cosmic rays. At these energies, gamma ray primaries interact with
the earth's magnetic field before they enter the atmosphere. We have developed a
simulation of gamma ray preshowers to study their effect on t
... More
Presented by Mr. Andrew O'NEILL
on
4 Jul 2007
at
14:45
Air-fluorescence detectors such as the High Resolution Fly's Eye (HiRes) instrument
are very sensitive to upward-going, Earth-skimming ultrahigh energy
electron-neutrino-induced showers.
This is due to the relatively large interaction cross sections of these high-energy
neutrinos and the Landau-Pomeranchuk-Migdal (LPM) effect, which is responsible for a
significant decrease in the cross secti
... More
Presented by Dr. Lauren SCOTT
on
5 Jul 2007
at
12:24
VERITAS employs a 12m segmented mirror and pixellated photomultiplier
tube camera to detect the brief pulse of Cherenkov radiation produced
by the extensive air shower initiated by a cosmic high-energy gamma
ray. The VERITAS data acquisition system consists of a 500
Mega-Sample-Per-Second custom-built flash ADC system, which samples
the Cherenkov light pulse every 2 nanoseconds. The integrate
... More
Presented by Dr. Peter COGAN
on
9 Jul 2007
at
14:45
For the chemical composition in the "knee" energy region,
we observe air shower core with hybrid detectors in Tibet,
Yangbajin(4,300 m a.s.l.).
We use the Tibet III air-shower array for the determination of
the primary energy and the burst detector for the measurement of
the energy flow of air shower core.
Previous phase of our experiment used emulsion chamber(X-ray films and
nuclear emuls
... More
Presented by Mr. Tatsumi OUCHI
on
4 Jul 2007
at
14:45
Observations of the Ground Level Enhancement (GLE) of 20 January 2005 are
used to investigate a commonly observed, but poorly understood feature of
this class of event. The Sanae neutron monitor observed three distinct peaks
during this event. The observations were augmented by a neutron moderated
detector, from which we could determine that the first, ephemeral peak had a
harder spectrum tha
... More
Presented by Prof. Harm MORAAL
on
6 Jul 2007
at
12:29
The arrival directions of ultrahigh energy extensive air showers by the Yakutsk
and AGASA array data have been considered. It is shown that 3 very high
ultrahigh energy showers with E>10^20 eV registered at the Yakutsk array
correlate with the nearest pulsars. The problem of cosmic ray origin is
discussed.
Presented by Dr. Alexei MIKHAILOV
on
4 Jul 2007
at
14:45
We analyze arrival time of air shower using Hirosaki AS Arrays. This array
consists of 5 scintillation detectors with GPS antenna for arrival times. We use
Erlang Distribution. The number of air showers observed within short time
windows is analized by using arrival time difference of k-events serial air
showers. We report the results of the analysis.
Presented by Prof. Nobusuke TAKAHASHI
on
4 Jul 2007
at
14:45
Expansion speed for limb CMEs has been shown to be a good approximation to determine
the radial speed. In this work we present an analytical model to obtain from lateral
expansion the radial propagation speed of CMEs. We found that the relation between
expansion and lateral speeds depends as well on the angular width. We compare the
results of the analytical model with the parameters of limb C
... More
Presented by Ms. Guadalupe MUÑOZ MARTÍNEZ
on
4 Jul 2007
at
14:45
General higher terms of Moliere series are solved analytically, in Moliere-
Heisenberg definite integral and/or Goldstein series. The terms of higher orders
up to n=6 are practically obtained. Applicable region of Moliere series is
extended to shorter depths of penetration down to B=5 by the results.
Presented by Prof. Takao NAKATSUKA
on
4 Jul 2007
at
14:45
The GRAPES-3 experiment observes extensive air showers using a high-density array of
scintillators and a large area tracking muon detector. The array consists of 300
scintillation detectors (each 1m^2 in area) and 16 modules of muon detectors having a
total area of 560m^2. Good angular resolution of the array is a key requirement for
detection of point sources of gamma rays. For this purpose w
... More
Presented by Mr. Akitoshi OSHIMA
on
9 Jul 2007
at
14:45
The striking alignment effect detected earlier in gamma-hadron stratospheric
STRANA superfamily is supplemented here by analysis of the arrangement of
all particles in the central area of the family. It showed the evident anisotropy in
the lateral distribution of these particles confirming a coplanar scatter effect in
the interaction.
Presented by Dr. Vladislav OSEDLO
on
9 Jul 2007
at
14:45
The subsonic heliosheath beyond the termination shock (TS) of the solar wind plays a
profound role in the transport of anomalous (ACR) and galactic cosmic rays (GCR). The
energetic particle observations of Voyager-1, after crossing the TS in December 2004,
indicate that the distribution of ACR is not uniform in the heliosheath.
We point out that our concepts based on a simple 1-D shock canno
... More
Presented by Dr. Jozsef KOTA
on
10 Jul 2007
at
12:41
The General Antiparticle Spectrometer (GAPS) exploits low energy antideuterons
produced in neutralino-neutralino annihilations as an indirect dark matter (DM)
signature that is effectively free from background. When an antiparticle is captured
by a target material, it forms exotic atom in an excited state which quickly decays
by emitting X-rays of precisely defined energy and a correlated pio
... More
Presented by Dr. Jason E KOGLIN
on
10 Jul 2007
at
11:30
We calculate the antideuteron flux expected from dark matter annihilation in the
galactic halo.
The propagation is treated in a full 2-D propagation model consistent with the
results obtained from the propagation of B/C and other galactic species.
We discuss the potentials of this indirect dark matter detection means and evaluate
the possible sources of uncertainties affecting future measur
... More
Presented by Dr. Fiorenza DONATO
on
10 Jul 2007
at
10:30
The atmosphere is a vital component of the detector in an atmospheric Cherenkov telescope. In order to
understand observations from these instruments and reduce systematic uncertainties and biases in their
data it is important to correctly model the atmosphere in simulations of the extensive air showers they
detect. The Very High Energy Telescope Array (VERITAS) is a system of 4 such telesco
... More
Presented by Dr. Michael DANIEL
on
9 Jul 2007
at
14:45
A new significant ground level enhancement was recorded by the worldwide
neutron monitor network during the minimum phase of the 23rd solar cycle, on
13 December, 2006. The event, also known as GLE70, started at ~ 2:48 UT,
whereas the neutron monitor flux in most stations reached its maximum in
~3:00-3:10 UT. In northern Europe the event was registered with big
amplitudes that in some c
... More
Presented by Dr. Eugenia EROSHENKO
on
6 Jul 2007
at
14:45
Air shower universality states that the electromagnetic part of hadron-induced
EAS can be completely described in terms of the primary energy and shower age.
In addition, simulations show that the muon part is well characterized by
an overall normalization which depends on the primary particle and hadronic
interaction model. We investigate the consequences of EAS universality
for ground ar
... More
Presented by Mr. Fabian SCHMIDT
on
5 Jul 2007
at
11:06
The arrival directions of ultrahigh energy extensive air showers registered at
the Yakutsk array are considered. The correlations of maxima in the distribution
of arrival directions of showers and doublets with the pulsar coordinates
located in the galactic plane are found. It is shown that the correlation of the
arrival directions of ultrahigh energy particles with the plane of Virgo clus
... More
Presented by Dr. Alexei MIKHAILOV
on
7 Jul 2007
at
09:42
We will talk about slow control system of Ashra (All-sky Survey High Resolution Air-shower detector) experiment. As
the name shows, it is an experiment observing fluorescence and Cherenkov light yielded by cosmic rays, which has
very wide FOV (80% of 2 pi str) and a few arc-min optical resolution. In addition to cosmic ray detection, it is able to
observe star (especially transient objects
... More
Presented by Mr. Akira OKUMURA
on
9 Jul 2007
at
14:45
The solution to the origin of the UHECRs, like the solution
to the origin of the galactic cosmic rays, depends on direct
cosmic ray observations in addition to multiwavelength
and UHE neutrino detections of cosmic-ray sources. The
advent of Auger, IceCube, GLAST, and ground-based
gamma-ray telescopes promises multi-channel data that
should solve this problem. In this talk, I review favor
... More
Presented by Dr. Charles DERMER
on
6 Jul 2007
at
17:25
The Pierre Auger Collaboration intends to extend the energy range of its southern
observatory in Argentina for high quality data from 0.1 to 3 EeV. The extensions
proposed and described in accompanying papers, include three additional fluorescence
telescopes with a more elevated field of view (HEAT) and a nested surface array with
750 and 433 m spacing respectively and additional muon detectio
... More
Presented by Dr. Gustavo MEDINA TANCO
on
6 Jul 2007
at
14:45
Despite notable progress in gamma-ray astronomy, understanding the
astrophysical sources of medium energy (MeV-range) gamma-rays still remains
somewhat of a mystery. Medium-energy gamma-ray observations require
diverse measurement techniques since the objects that produce these gamma-
rays are both extended and point-like, transient and steady, and include both
continuum and line emission
... More
Presented by Dr. Stanley HUNTER
on
10 Jul 2007
at
10:30
JEM-EUSO will study ultra-high-energy cosmic rays by their optical yield in the
atmosphere. To evaluate this yield it is important to monitor the atmosphere
inside the field-of-view (FOV) of the JEM-EUSO receiver. This monitoring shall
permit the correction of the JEM-EUSO signal, where the critical parameters are
the cloud presence and top altitude. The Atmospheric Monitoring System will
... More
Presented by Dr. Valentin MITEV, Dr. Mitsuteru SATO
on
6 Jul 2007
at
14:45
An atmospheric monitoring system has installed at Black Rock Mesa in the Utah
desert to study the properties of atmosphere using a LIDAR(Light Detection And
Ranging) system and an infra-red(IR) camera for cosmic rays experiment. The aims of
atmospheric monitoring are to calibrate observed cosmic ray's energy and to determine
detectable region of the fluorescence detectors. For these reasons, t
... More
Presented by Prof. Michiyuki CHIKAWA
on
6 Jul 2007
at
14:45
A cosmogenic radionuclide Be-7 (half life 53.3 days) results from nuclear interactions of galactic
cosmic rays in the Earth's atmosphere. Most of Be-7 is produced in the lower stratosphere and
slowly tranported to the surface. Be-7 plays a role of atmospheric tracer and its measurements
provide an important clue on atmospheric air mass motions. Since 2002 we have continuously
measured sur
... More
Presented by Prof. Masato YOSHIMORI
on
6 Jul 2007
at
14:45
The IceCube Neutrino Detector is a cubic kilometer ice-Cherenkov detector being
constructed in the deep ice under the geographic South Pole. IceCube is sensitive to
high-energy muon neutrinos and muon anti-neutrinos by detecting the secondary muon
produced when the neutrino interacts in or near the instrumented volume. The
principal source of muon neutrinos are atmospheric neutrinos which come
... More
Presented by Dr. John PRETZ
on
7 Jul 2007
at
12:29
The Super-Kamiokande started observation in April of 1996 and continued the
data taking for five years of initial running period (SK-I) till the maintenance in
July of 2001. The Super-Kamiokande continued the data taking with the half
PMT density in the second period (SK-II) from resuming in December of 2002 to
shutdown for the reconstruction to return the PMT density in October 2005.
Us
... More
Presented by Ms. Yumiko TAKENAGA
on
7 Jul 2007
at
12:41
The EAS characteristics relating to the lateral development of a shower at sea level
are considered, namely, a mean square radius for the spatial distribution of charged
particles, the total number of charged particles and muons with E(th) >= 1 GeV and
their correlation at fixed energy; the longitudinal development of a shower in the
atmosphere, i.e. a maximum depth of EAS. The energy-dependen
... More
Presented by Dr. Stanislav KNURENKO
on
4 Jul 2007
at
14:45
BESS-Polar II (the 2nd version of the BESS-Polar spectrometer) has been
prepared for the next Antarctic campaign planned in December 2007. The aim of the
experiment is precise measurement of the low-energy antiproton spectrum
and to search for antimatter at this solar minimum period, with 5 times higher
sensitivity than the total of previous measurements in BESS-Polar I. Most of the detector
... More
Presented by Dr. Thomas HAMS
on
4 Jul 2007
at
14:45
We carried out a balloon observation of cosmic rays using the CALET prototype
at the Sanriku Balloon Center of the Japan Aerospace Exploration Agency. The
prototype detector consists of 1024 scintillating fibers for track imaging and 24
BGO scintillator bricks for total absorption of cosmic rays. The observation was
carried at altiude between 35 and 37 km for about 4 hours. We measured
e
... More
Presented by Dr. Yuki SHIMIZU
on
4 Jul 2007
at
14:45
Ultra-high energy cosmic rays (UHECR's) above 100 EeV have been observed with
several experiments. Their origin and propagation mechanism are still
in mystery mainly due to the low statistics. In order to observe UHECR's
with sufficient statistics, the JEM-EUSO experiment is going on.
In the JEM-EUSO experiment, fluorescence and Cherenkov light from the
extensive air showers induced by UHECR
... More
Presented by Dr. Naoto SAKAKI
on
6 Jul 2007
at
14:45
High altitude balloon-borne experiments have been a part of Cosmic Ray Research
almost from the inception of the field. Major advances have been, and continue to
be, made with balloon missions, due both to improvements in instrumentation and to
advances in balloon technology and operational techniques. Today we can fly nearly
two ton cosmic ray payloads for periods up to 4-6 weeks at altitud
... More
Presented by Dr. John P. WEFEL
on
4 Jul 2007
at
16:30
Silicon sensors with 64 pixels of 1 cm^2 area and 500 micron thickness were developed
as building blocks of a large array for the charge identification of cosmic ray
nuclei in balloon-borne or space-based experiments. A small telescope of sensors was
exposed to pion and proton beams, interacting in a target, at CERN. Experimental
results on the performance of the sensors will be reported.
Presented by Prof. Pier Simone MARROCCHESI
on
4 Jul 2007
at
14:45
The mirror facets on the VERITAS telescopes, which are of
Davies-Cotton design, are aligned with the telescope axis in
the horizontal position using a laser projector at the radius
of curvature. The instrument used will be described. The
mechanical design of the Optical Support Structure permits some
gravitational slumping with elevation which can be counteracted by
bias alignment (deliberat
... More
Presented by J. TONER
on
9 Jul 2007
at
14:45
The Very Energetic Radiation Imaging Telescope Array System (VERITAS) is an array of
four 12m diameter Imaging Atmospheric Cherenkov Technique (IACT) telescopes operated
at the base of Mt. Hopkins in southern Arizona. The four-telescope experiment started
operation in February, 2007. GeV and TeV gamma-ray observations of blazars can be
used to probe the structure and composition of their jets,
... More
Presented by Prof. Henric KRAWCZYNSKI
on
9 Jul 2007
at
08:30
Milagro is a water-Cherenkov detector capable of observing air showers produced by gamma- rays. The wide field of view (~2 sr) and high duty cycle (>90%) of Milagro make it ideal for searching for transient very high energy emission. We will report on the results of a blind search of the Milagro data for very high energy ranging from 160 μs to 6 minutes. While this analysis is primarily aimed at
... More
Presented by Mr. Vlasios VASILEIOU
on
9 Jul 2007
at
12:29
PG 1553+113 is a known BL Lac object, newly detected in the GeVTeV energy
range by H.E.S.S. and MAGIC. The redshift of this source is unknown and a
lower limit of z>0.09 was recently estimated. The very high energy (VHE)
spectrum of PG 1553+113 is attenuated due to the absorption by the
low-energy photon field of the extragalactic background light (EBL). Here
we correct the combined H.E.S.S.
... More
Presented by Mr. Daniel MAZIN
on
6 Jul 2007
at
14:45
The large FOV of the AGILE Gamma-Ray Imaging Detector (GRID), 2.5 sr, will allow the
whole sky to be surveyed once every 10 days in the 30 MeV - 50 GeV energy band down
to 0.05 Crab Units. This fact gives the opportunity of performing the first
flux-limited, high-energy g-ray all-sky survey. The high Galactic latitude
point-source population is expected to be largely dominated by blazars. Seve
... More
Presented by Prof. Alessandro DE ANGELIS
on
6 Jul 2007
at
14:45
Muon telescopes can have several applications, ranging from astrophysical to
solar-terrestrial interaction studies, and fundamental particle physics. We
show the design parameters, characterization and end-to-end simulations of a
detector composed by a set of three parallel dual-layer scintillator planes,
buried at fix depths ranging from 0.30 m to 3 m. Each layer is 4 m2 and is
compose
... More
Presented by Mr. Federico SANCHEZ
on
6 Jul 2007
at
14:45
We are proposing the CALET mission carried out on the Japanese Experiment
Module of International Space Station. Major purpose of the mission is to
search for the nearby cosmic ray sources and dark matter. The detector
consists of an imaging calorimeter and a total absorption calorimeter to detect
the electrons and the gamma-rays up to 10 TeV with very efficient rejection
power of th
... More
Presented by Prof. Shoji TORII
on
6 Jul 2007
at
11:06
We have proposed the CALET(CALorimetric Electron Telescope)
mission to observe galactic electrons and gamma rays on ISS/JEM.
In this paper we present the measurements of long-term and
short-term variations of electron intensities in the helisphere.
Galactic electrons of 1-100GeV energy range mostly have negative charges
and the spectrum largely varies with solar activities. Thus we
exp
... More
Presented by Dr. yoshiko KOMORI
on
9 Jul 2007
at
14:45
Observations from the Cosmic Ray Isotope Spectrometer (CRIS) aboard NASA’s Advanced
Composition Explorer (ACE) have shown that all relevant galactic cosmic ray isotopic
ratios measured are consistent with an OB-Association origin of galactic cosmic rays
(GCRs). Additionally CRIS measurements of the isotopic abundances of 59Ni and 59Co
have shown that the 59Ni has completely decayed into 59Co
... More
Presented by W. R. BINNS
on
5 Jul 2007
at
09:30
A comparative study of tri-diurnal anisotropy of Cosmic Ray intensity data has
been performed for Deep River neutron monitoring station on geo magnetically
60 quietest days, 120 quiet days and all days during 1992-94. Histographic
plots of percentage of occurrence of days for Phase (hrs) in a definite interval
reveals that Phase is maximum in the interval of 0 to 2 hrs directions during t
... More
Presented by Mr. Mahendra RICHHARIA
on
9 Jul 2007
at
14:45
The SONG instrument onboard the CORONAS-F satellite detected solar flare
gamma-ray emission in the energy range 50 keV – 300 MeV. Study of the fluxes
and spectra obtained during several major flares shows presence of the
gamma-ray emission at the energy > 40 MeV with the characteristic spectrum
feature generated by neutral pion decay. This feature proves unambiguously
that protons wer
... More
Presented by Prof. Karel KUDELA
on
4 Jul 2007
at
12:53
Fluxes of protons at the energies 0.8 - 4 GeV accelerated during solar flares of
October-November 2003 were detected onboard the CORONAS-F satellite (polar
circular orbit with an altitude ~450 km). The SONG instrument had sufficient
geometric factor (~1500 cm2∙sr) to detect directly solar protons as a count rate
exceeding above a background level when the satellite crossed a wide range o
... More
Presented by Prof. Karel KUDELA
on
4 Jul 2007
at
11:18
The differential energy spectrum of cosmic rays from Cherenkov radiation measurements
in EAS in the energy range of 10**15 - 10**20 eV has been compared with an anomalous
diffusion model for the particles in interstellar space having fractal properties
(Lagutin et al., 2001). Calculations of the spectrum have been carried out for each
of five types of primary nuclei: p, He, C, Mg, Fe, and the
... More
Presented by Dr. Stanislav KNURENKO
on
4 Jul 2007
at
14:45
The first flight of the Cosmic Ray Energetics And Mass (CREAM) balloon experiment
employed a Timing Charge Detector (TCD) and a Calorimeter. For high energy events a
large background of back splash particles are created in the Calorimeter, which wash
out the low Z charge peaks in the TCD. Traditionally, highly pixelated detectors are
used in this situation in order to reduce the effects of the
... More
Presented by Taylor CHILDERS
on
4 Jul 2007
at
14:45
For a long time radio emission accompanying extensive air showers (EAS) is considered
as an alternative to traditional methods of high energy cosmic ray detection (> 10^17
eV). In this paper, results of simulations of radio signals from air showers with
energy greater than 10^17 eV are reported. The simulations are based on a
track-by-track radio emission calculation using the EGSnrc Monte Car
... More
Presented by Dr. Ralph ENGEL
on
6 Jul 2007
at
14:45
Utilizing the Gaisser parameterization of the differential vertical muon intensity
and propagating the spectrum underground according to the statistical ionization and
radiative muon energy losses, it is possible to calculate the underground muon
intensity Crouch curve. In addition it is feasible to refine the spectral index of
the Gaisser parameterization by minimizing the deviation from the
... More
Presented by Dr. Jeffrey DE JONG
on
9 Jul 2007
at
14:45
We calculate the cosmic ray muon flux at ground level using the model
of primary cosmic ray spectra suggested by Zatsepin and Sokolskaya.
The model supposes contributions to the cosmic ray flux of three classes
of sources - the shocks from exploding stars, nova and supernova of
different types. The model is supported by the new data obtained in the
ATIC-2 balloon experiment. Present
... More
Presented by Alexander PANOV
on
9 Jul 2007
at
14:45
The Milagro TeV ground-level gamma-ray telescope detects Forbush decreases
in several of its data channels. To understand how the instrument responds
to Forbush decreases, one must calculate, through simulations, its behavior
to a changing galactic cosmic-ray background as that background is modulated
by heliospheric activity. To this end, we have been modeling the response
of the instrumen
... More
Presented by Prof. James RYAN
on
6 Jul 2007
at
09:30
The balloon-borne ANITA neutrino telescope successfully launched
from McMurdo Station, Antarctica during the 2006-2007 austral summer.
In this paper we present ongoing studies of the energy resolution and
system response of the ANITA detector, which provide an excellent test
bed for validating the ANITA Monte Carlo, and will be of great interest if
ANITA discovers signal events. While
... More
Presented by D. GOLDSTEIN
on
9 Jul 2007
at
14:45
The air fluorescence detectors (FDs) of the Telescope Array (TA)
experiment have been constructed in a dessert of Utah, USA.
We can measure the longitudinal developments of EASs directly
with the FDs by detecting air fluorescence lights and determine
the primary energies of ultra-high energy cosmic rays.
In order for accurate observation and measurements of EASs,
elaborate detector cal
... More
Presented by Dr. Hisao TOKUNO
on
6 Jul 2007
at
14:45
The surface detector of Telescope Array(TA) experiment are deployed in desert of
western utah,USA. The detector consists of two layers of plastic
scintillators of 3m2 area with wave length shifter fiber(WLSfiber).
And at each layer,PMT are connected with WLS fibers.
At each layer ,2 LEDs are also equipped to check PMT linearity.
To estimate number of shower particles with good accuracy, it
... More
Presented by Dr. Toshiyuki NONAKA
on
10 Jul 2007
at
11:06
The Cosmic Ray Energetics And Mass (CREAM) calorimeter is designed to measure the
spectra of cosmic-ray particles over the energy range from ~10^12 eV to ~10^15 eV.
Its first flight as part of the CREAM-I balloon-borne payload in Antarctica during
the 2004/05 season resulted in a record breaking 42 days of exposure to the cosmic
radiation. A few iterations of the calibration using various bea
... More
Presented by Mr. Y. S. YOON
on
4 Jul 2007
at
14:45
LOPES is one the pioneering experiments for the measurement of radio emission
from air showers with digital radio receivers. It is set up at the site of the
KASCADE-Grande air shower array and takes data in conjunction with it. This
gives us the unique possibility to combine LOPES and KASCADE-Grande data.
In its second phase LOPES has been extended to 30 antennas, which increases
the detect
... More
Presented by Dr. Andreas HORNEFFER
on
6 Jul 2007
at
10:30
VERITAS is an array of four identical telescopes designed for detecting and measuring
astrophysical gamma rays with energies in excess of 100 GeV. Each telescope uses a 12
m diameter mirror to collect Cherenkov light from air showers initiated by the
incident gamma rays and direct it onto a `camera' comprising 499 photomultiplier
tubes (PMTs) read out by flash ADCs. We describe here calibratio
... More
Presented by Prof. David HANNA
on
9 Jul 2007
at
14:45
Cosmic-ray interactions are the only known source of the rare isotope 6Li. The
standard picture is that the observed solar 6Li is produced by galactic cosmic-rays
accelerated in supernova remnants. Thus lithium-6 is a unique probe of the local
Galactic (hadronic) cosmic-ray history. On the other hand, extragalactic gamma-ray
background is a measure of cosmic-ray fluence but for the average st
... More
Presented by Dr. Tijana PRODANOVIC
on
5 Jul 2007
at
09:18
Current efforts in ground-based VHE gamma-ray astronomy use two methods: Atmospheric
Cherenkov Telescopes (ACTs) and Extended Air Shower (EAS) Arrays. While ACTs
typically have greater sensitivity to gamma-ray point sources and lower energy
thresholds,
EAS arrays have an enormous advantage in exposure to the sky due to their large
fields of view (1-2 sr) and high duty cycle (>~90%). The lower
... More
Presented by Dr. Andrew SMITH
on
4 Jul 2007
at
14:45
Gamma-ray bursts (GRBs) have been observed up to energies of a few GeV by satellite
observatories. In particular, GRB941017 showed a spectral component extending beyond
200MeV and distinct from the previously observed at keV energies. Ground based
telescopes have marginally observed very high energy emission (>100GeV). For
instance, the Milagrito observation of GRB970417a hinted at a distinct
... More
Presented by Dr. Cesar ALVAREZ OCHOA
on
6 Jul 2007
at
14:45
Using the Solar Isotope Spectrometer (SIS) on NASA's ACE spacecraft, we have measured
the composition and energy spectra of anomalous cosmic rays (ACRs) near 1 AU down to
energies of ~10 MeV/nucleon since August 1997. Recently these measurements have been
augmented by data from the Low Energy Telescope (LET) on the STEREO spacecraft, which
allows us to extend the energy spectra down to ~3 MeV
... More
Presented by Dr. Richard LESKE
on
7 Jul 2007
at
12:29
Past works suggest the existence of several periodicities in comic ray data.
Nevertheless, the reliability of the obtained periods is not often faced.
In this paper, neutron monitor and IMP data were analysed by using the Fast
Fourier Transform and Wavelet techniques to determine the reliability of each
identified medium- and long-term periodicity. Moreover, their relevance is
analysed along
... More
Presented by Dr. Monica LAURENZA
on
9 Jul 2007
at
14:45
The three stations of the Telescope Array fluorescence detectors (FDs)
contain 12 telescopes each, and each of the telescopes has a 256 pixel
PMT camera with a field of view of 18 degree x 16 degrees.
The fluorescence signals of each pixel are digitized with their
waveforms by the Signal Digitizer/Finder modules (SDFs). The signal
alerts from the SDFs are send to the Track Finder modules (TF)
... More
Presented by Dr. Hisao TOKUNO
on
6 Jul 2007
at
14:45
A procedure was developed to compute in near real-time the effective vertical cutoff
rigidities for a world grid with a mesh size of 5 x 5 degrees in geographic longitude
and latitude. The evaluation is made every three hours. The cutoff rigidities are
calculated by the backward trajectory tracing method, where the geomagnetic field is
represented by the IGRF model for the internal sources and
... More
Presented by Dr. Rolf BUETIKOFER
on
6 Jul 2007
at
14:45
The Cosmic Ray Energetics And Mass (CREAM) experiment has now flown over Antarctica
for a total of 70 days, combining a record-breaking continuous 42 days in the air
with a second Long Duration Balloon flight. The array of detection techniques
utilized by CREAM includes a Timing Charge Detector, a Transition Radiation Detector,
a Silicon Charge Detector, and a tracking Calorimeter to obtain th
... More
Presented by T. J. BRANDT
on
6 Jul 2007
at
11:42
Energetic heavy ions with 20 – 200 MeV/n in the radiation belts have been observed by
Heavy Ion Telescope (HIT) onboard TSUBASA satellite which stayed in the geostationary
transfer orbit with the inclination of 28.5 deg. The observed data during quiet
period in the outer region of radiation belt found out that the relative abundance
for major elements, C, O, Ne, Mg, Si and Fe, were similar t
... More
Presented by Dr. Makoto HAREYAMA
on
10 Jul 2007
at
09:42
Further analysis is made on the Tibet hybrid experiment to measure the energy
spectrum of light component (proton and helium) of the cosmic rays at the knee.
The result from three years observation by the burst detectors operated
with Tibet III air-shower array is presented and compared with the
result of the first phase experiment.
Presented by Prof. Makio SHIBATA
on
4 Jul 2007
at
12:29
Following the terminology adopted by Supe-Kamiokande, Fully Contained
Events are observed in the electron-neutrino which result in the cascade
shower for high energy neutrino astrophysics project, such as NT200, AMANDA
etc., while muon-neutrino event re observed as Partially Contained Events. Fully
Contained Events are essentially only source by which we could extract the
reliable inform
... More
Presented by Prof. Akeo MISAKI
on
9 Jul 2007
at
14:45
Gamma-ray astronomy is a new emerging and very successful branch
of astronomy and astrophysics. Exciting results have been obtained by the
current generation Cherenkov telescope systems such as H.E.S.S., MAGIC,
VERITAS and CANGAROO. The H.E.S.S. survey of the galactic plane has
exhibited a large number of sources and new astrophysics as for example the
question about the origin of the cosmi
... More
Presented by Dr. Thomas SCHWEIZER
on
10 Jul 2007
at
11:06
The properties of extremely energetic neutrino- and cosmic ray-induced
showers depend on the shower energy, on the type of particle initiating the shower,
and on the medium. Studying these dependences is important both for understanding
cascade phenomenology, and for estimating the efficiency of experiments using the radio
technique. In this contribution we study the feasibility of applying
... More
Presented by Dr. Jaime ALVAREZ-MUNIZ
on
10 Jul 2007
at
13:17
The problem of identifying gamma ray events hidden in charged cosmic ray background
(so called
hadrons) in Cherenkov telescopes is one of the key problems in VHE gamma ray
astronomy. In this
contribution, we present a novel approach to this problem by implementing different
classifiers
relying on the information of each pixel of the camera of a Cherenkov telescope,
rather than using
Hilla
... More
Presented by Ms. Raquel DE LOS REYES
on
9 Jul 2007
at
14:45
The monitoring of atmospheric conditions is very important for
fluorescence observations. Particularly, the presence of clouds can
drastically distort the signal from the extensive air shower. Infra-red
(IR) sensors, measuring sky temperature, can help to distinguish clouds,
which are usually significantly warmer than clear skies. An array of such
sensors, covering the HiRes detector's f
... More
Presented by Yulia FEDOROVA
on
6 Jul 2007
at
14:45
Several candidate neutrino sources
manifest variable electromagnetic emission, often with burst-like behaviour.
It is interesting to consider that the neutrino emission from such sources
could have similar time character. In the context of the so called
multi-messenger approach, information from high energy neutrinos and
different electromagnetic wavelengths (e.g., high gamma-rays) is combine
... More
Presented by Dr. Elisa BERNARDINI
on
9 Jul 2007
at
14:45
The Trans-Iron Galactic Element Recorder (TIGER) was launched in December 2001 and
2003 from McMurdo, Antarctica and was designed to observe elements ranging from 14 <
Z < 40 over an extended energy range. Observations of radioactive isotopes produced
during explosive nucleosynthesis such as Ni-59 that decay only through electron
capture provide important constraints on the delay between nucl
... More
Presented by Dr. G. A. DE NOLFO
on
4 Jul 2007
at
14:45
Extensive air showers are associated with transient radio emission, which could
provide a new mode of detection of UHECR with an important target volume and a high
duty cycle. The Codalema experiment has been set up and is running in the Radio
Observatory in Nançay, France, to investigate this possibility.
The apparatus is composed of an antenna array overlapped by a ground particle array.
A
... More
Presented by Dr. Didier LEBRUN
on
7 Jul 2007
at
08:42
The IceCube detector is already the world’s largest neutrino detector and when
completed in 2011, will be a cubic kilometer in volume. However, even under
optimistic assumptions about neutrino emission, the potential neutrino signal in
IceCube from AGN and GRBs may be small. The atmospheric neutrino background after
cuts will result in 1-2 neutrinos/yr/km3/deg2 above 1 TeV. For a three year
... More
Presented by Prof. Jordan GOODMAN
on
10 Jul 2007
at
12:41
In early December 2006, a large active region (number 10930) rotated over the eastern
limb of the Sun. As it crossed the disk, it generated 4 X-class flares and at least
3 halo coronal mass ejections. Two large SEP events were generated when the region
was at ~E70 and ~W25 and were observed by several spacecraft, including ACE and
STEREO. We have combined observations from the Solar Isotope
... More
Presented by Dr. Christina COHEN
on
4 Jul 2007
at
12:05
We survey the properties (including the abundance variations) of the >20 MeV
proton events (~300) that occurred in the years 1997-2005 inclusive. About
20% of the events have the properties of so-called "impulsive events" that are
considered to arise from acceleration in flares. We compare the properties and
associated flare phenomena of these events with those of the larger events
that
... More
Presented by Dr. Hilary CANE
on
4 Jul 2007
at
11:06
A comparison of the energetic neutral atom observations by CELIAS/HSTOF
with the Voyager 1 measurements of the termination shock particles in the
heliosheath shows that the ENA hydrogen flux is consistent with Voyager 1
data. On the other hand, the ENA He flux is much higher than expected from
the helium ion fluxes measured by Voyager 1. We discuss possible
explanations and implications
... More
Presented by Dr. Andrzej CZECHOWSKI
on
4 Jul 2007
at
14:45
We have performed a detailed Monte Carlo (MC) simulation for the
Advanced Thin Ionization Calorimeter (ATIC) detector using the MC
code FLUKA-2006 which is capable of simulating particles up to
10 PeV. The ATIC detector has completed two successful balloon flights
from McMurdo, Antarctica lasting a total of more than 35 days. ATIC is
designed as a multiple, long duration balloon flight, inv
... More
Presented by Dr. Rathnayaka GUNASINGHA
on
4 Jul 2007
at
09:30
Due to geomagnetic cascading, the properties of air showers initiated by photons
above 10^19 eV depend strongly on the arrival direction and on the geographical
location of the experimental site. This offers the possibility of a complementary
search for such ultra-high energy photons with observatories located at sites with
significantly different local geomagnetic field. In this paper we comp
... More
Presented by Dr. Piotr HOMOLA
on
7 Jul 2007
at
11:42
The majority solar energetic particle events exhibit exponential-law decays for
few-MeV protons. Profiles of mid-relativistic electrons, however, are of
predominantly power-law shape. The comparison of experimental values of
decay times, tau(obs), with those obtained in theoretical models considering
convection transport and adiabatic deceleration shows that the expected
values tau(theo
... More
Presented by Dr. Karoly KECSKEMETY
on
4 Jul 2007
at
14:45
Cosmic rays with energies between 10^16.5 and 10^18.5 eV exhibit a rich range
of features. The energy spectrum changes index at at least two points, known
as the "second knee" and the "ankle". There appears to be a composition change
in this energy regime as well, which may indicate a shift in predominance from
galactic to extragalactic sources. The Telescope Array Low-Energy Extension -
... More
Presented by Prof. John BELZ
on
9 Jul 2007
at
09:42
A key step towards the understanding of the origin of
ultra-high energy cosmic rays is their mass composition.
Primary photons and neutrinos produce markedly different
showers from nuclei, while showers of nuclear species are
not easy to distinguish. To maximise the discrimination
with the Pierre Auger Observatory ideally all mass-sensitive
observables should be combined, but the 10% duty cy
... More
on
4 Jul 2007
at
12:05
SENECA is a hybrid air shower simulation written by H. Drescher that utilizes both
Monte Carlo simulation and cascade equations. By using the cascade equations only in
the high energy portion of the shower, where they are extremely accurate, SENECA is
able to utilize the advantages in speed from the cascade equations yet still produce
complete, three dimensional particle distributions at groun
... More
Presented by Mr. Jeff ALLEN
on
6 Jul 2007
at
14:45
The CALorimetric Electron Telescope (CALET) mission is proposed for the observation
of high energy cosmic rays and gamma radiation for the JEM-EF attached payload on the
International Space Station. The instrument, equipped with an imaging calorimeter of
scintillating fibers (IMC) and a total absorption BGO calorimeter (TASC), is
optimized for the measurement of cosmic ray electrons in the TeV
... More
Presented by Prof. Pier Simone MARROCCHESI
on
4 Jul 2007
at
14:45
Theoretical predictions for neutrino fluxes indicate that km3 scale detectors are
needed to detect certain astrophysical sources. The three Mediterranean
experiments, ANTARES, NEMO and NESTOR are working together on a design
study, KM3NeT, for a large deep-sea neutrino telescope. A detector placed in
the Mediterranean Sea will survey a large part of the Galactic disc, including the
Galac
... More
Presented by Mr. damien DORNIC
on
9 Jul 2007
at
14:45
The Gamma-Ray Large Area Space Telescope (GLAST),scheduled to be
launched in Fall 2007, is a next generation high energy gamma-ray
observatory. The Large Area Telescope (LAT) instrument on-board GLAST
with a wide field of view (>2 sr), large effective area and 20 MeV to
>300 GeV energy range, will provide excellent opportunity for future
Dark Matter studies.
We present an overview o
... More
Presented by Dr. Eric NUSS
on
10 Jul 2007
at
11:06
In 2005, the MAGIC telescope observed an unprecedented rapid flare from the AGN Mrk
501. A fast and strong variability was found in several adjacent energy bands above
100 GeV and was used to search for correlated flux variations at different energies.
The resulting constraints on different possible Quantum Gravity effects have been
investigated and will be presented.
Presented by A. BILAND
on
5 Jul 2007
at
12:17
A number of models of quantum gravity violate Lorentz invariance and
predict an energy dependence of the speed of light, leading to a dispersion
of signals at high energies that travel over cosmological distances. Limits
on the dispersion from short-duration substructures observed in soft
gamma-rays emitted by GRBs at cosmological distances have provided
interesting bounds on this violation o
... More
Presented by Prof. Stefan WAGNER
on
10 Jul 2007
at
11:42
In a recently proposed model the cosmic rays spectrum at energies above EeV can be
fitted with a minimal number of unknown parameters assuming that the extragalactic
cosmic rays are only protons with a power law source spectrum. Within this minimal
model, after fitting the observed HiRes spectrum with four parameters (proton
injection spectrum power law index, maximum energy, minimum distance
... More
Presented by Dr. Oleg KALASHEV
on
7 Jul 2007
at
09:18
Geminga is a nearby pulsar with an age of 3.42e+05 yr and a spin down power of
3.2e+34 erg/s at present. The wind of this pulsar most probably had powered a PWN
that broke up about less than 1.e+05 yr after the birth of the pulsar. Assuming that
leptonic particles accelerated by the pulsar were confined in the PWN and got
released into the interstellar medium on breakup of the PWN, we calcu
... More
Presented by Dr. Ingo BUESCHING
on
4 Jul 2007
at
12:17
In the context of the report by the AGASA experiment of an apparent excess in the
cosmic ray flux above the energy of the expected GZK feature, a variety of "top-down
models" have been proposed for the origin of ultra-high-energy cosmic rays (UHECRs).
These models involve the decay of supermassive particles and generically predict high
neutrino and photon fluxes at ultra-high energy. Relying o
... More
Presented by Dr. Dmitri SEMIKOZ
on
4 Jul 2007
at
14:45
When testing and calibrating particle detectors in a test beam, accurate
tracking information independent of the detector being tested is extremely
useful during offline analysis of the data. A general purpose Silicon Beam
Tracker (SBT) was constructed with an active area of 32.0 x 32.0 mm^2 to
provide this capability for the Cosmic Ray Energetics And Mass (CREAM)
calorimeter. The tracke
... More
Presented by H. S. AHN
on
4 Jul 2007
at
14:45
The light emitted by an extensive air shower undergoes scattering on molecules and
aerosols in the atmosphere. The scattering effect not only attenuates the light, but
also contributes to the signal recorded by a detector. Hence, this effect directly
influences the determination of shower energy. In routine analyses so far only
contributions from direct and singly-scattered Cherenkov photons h
... More
Presented by Prof. Henryk WILCZYNSKI
on
4 Jul 2007
at
14:45
An analysis of the solar magnetic field strength (B(nT)) was based on the
temporal evolution of the minimum (Bmin) values in relation to the maximum
(Bmax) values of the 300-year data series. Three results seem of particular
significance. A two-step cycling mode is exhibited by the absolute values of
Bmax and Bmin. The ratios of Br = (Bmax-Bmin)/(Bmax+Bmin) can be defined as
the dimen
... More
Presented by Dr. Gisela DRESCHHOFF
on
9 Jul 2007
at
14:45
Recently we have proposed that the long term solar modulation
of galactic cosmic rays (CR) is influenced by coronal mass eyection (CME)
activity.
In this work, we analyze the effect of CMEs number and
latitudinal changes on the CR flux during positive and negative
magnetic cycles.
For CME data, we use both, recent observations by the Large Angle and
Spectrometric Coronagraph (LASCO) expe
... More
Presented by Dr. Alejandro LARA
on
6 Jul 2007
at
08:30
The Cosmic Ray Energetics And Mass balloon-borne experiment has
accumulated 70 days of exposure during two successful flights in Antarctica.
The instrument is configured with complementary and redundant particle
detectors. Energy measurements are made with a transition radiation detector
and an ionization calorimeter. Charge measurements are made with timing,
pixelated Si, and Cherenko
... More
Presented by Prof. Eun-Suk SEO
on
5 Jul 2007
at
08:30
The first long-duration balloon flight of TRACER in 2003 provided high-quality
measurements of the primary cosmic-ray nuclei over the range oxygen (Z = 8) to iron
(Z = 26). The analysis of these measurements is now complete, and we will present
the individual energy spectra and absolute intensities of the nuclei O, Ne, Mg, Si,
S, Ca, A, and Fe. The spectra cover the energy range from 1 GeV/n
... More
Presented by Dr. Patrick BOYLE
on
4 Jul 2007
at
10:42
The study of cosmic rays (CRs) is a very mature subject developed around
the concept of radiative particle flux phi as a mono-variant function of
energy E, that is phi = phi(E). This is based on the notion of the cosmos as
being filled with cosmic radiation in the form of a collisionless exosphere
of plasma. Neutrals, however, are likewise ubiquitous in space and planetary
trapped-radiat
... More
Presented by Dr. Thomas WILSON
on
6 Jul 2007
at
14:45
Observations of cosmic-ray helium energy spectra provide important constraints on
cosmic ray origin and propagation. However, helium intensities measured at Earth are
affected by solar modulation, especially below several GeV/nucleon. Observations of
helium intensities over a solar cycle are important for understanding how solar
modulation affects galactic cosmic ray intensities and for sepa
... More
Presented by Dr. Georgia DE NOLFO
on
9 Jul 2007
at
14:45
We present a physical model to calculate cosmic ray induced ionization in the
atmosphere. The model is based on the Monte-Carlo CORSIKA tool, which simulates full
development of an electromagnetic-muon-nucleonic cascade in the atmosphere, with the
FLUKA package used for low energy interactions. The model is applicable to the entire
atmosphere, from the ground up to the stratosphere. A comparis
... More
Presented by Dr. Ilya USOSKIN
on
7 Jul 2007
at
09:18
Earlier we have found a significant statistical relationship between geomagnetic
activity as measured by the Kp index and hurricane intensity as measured by the
maximum wind speed for a certain type of higher-latitude hurricanes. Here we
reexamine this relationship comparing changes in cosmic ray intensity and hurricane
intensification rates (time derivative of hurricane intensity). Intensific
... More
Presented by Prof. Stilian KAVLAKOV
on
6 Jul 2007
at
14:45
We have installed a new air shower array at Mount Chacaltaya (5,200m
above sea level) to observe primary cosmic rays with energies greater
than 10^15 eV. In our previous experiments, we measured energy spectrum
and nuclear composition of primary cosmic rays around the knee region.
Above all, we obtained the cosmic ray composition with three independent
techniques, namely from the equi-i
... More
Presented by Dr. Yoshiki TSUNESADA
on
4 Jul 2007
at
14:45
As part of our on-going investigation of the charge-sign dependence in solar
modulation, we measured the cosmic ray positron abundance (~1GeV) on a
long duration balloon flight from Kiruna, Sweden to Victoria Island, Canada
during June 2006. Preliminary results from this flight will be presented and
compared to previous results.
Presented by Prof. Paul EVENSON
on
9 Jul 2007
at
11:42
Cosmic Ray Tau Neutrino Telescope (CRTNT) is designed to detect tau lepton
showers initiated from Earth-skimming tau neutrinos. A potential site is located
at Balikun, Xinjiang, China. Two CRTNT Cerenkov imaging telescopes are
installed at Yangbajing, Tibet (4300m a.s.l.) near the ARGO-YBJ RPC carpet
detector, with which coincident observation of cosmic ray showers above
10^14 eV is perf
... More
Presented by Prof. Huihai HE
on
6 Jul 2007
at
14:45
Physical model for calculation cosmic ray induced ionization in the atmosphere is presented. The model is based on Monte Carlo simulation with CORSIKA 6.52 code using FLUKA and QGSJET hadronic interaction subroutines. On the basis of the simulation results the ion pair production in the atmosphere and the impact of the different shower components, precisely the electromagnetic, muon and hadronic i
... More
Presented by Prof. Peter VELINOV
on
6 Jul 2007
at
14:45
For energies less than ~3 GeV/n, the Cosmic Rays Antideuteron component due
to spallation becomes negligible for kinematic reasons and the detection of
even a single antideuteron would strongly suggest the existence of new
sources, like neutralino Dark Matter.
The AMS-02 experiment, on board of ISS for a long duration mission (3 years),
thanks to its large acceptance (~ 0.5 m2 sr) and it
... More
Presented by Dr. Francesca GIOVACCHINI
on
9 Jul 2007
at
14:45
The High Resolution Fly's Eye (HiRes) fluorescence detectors have been
collecting extensive air shower (EAS) data for more than 6 years . The
obtained statistics allows us to more precisely estimate the mass
composition of the ultra high energy cosmic rays (UHECR). In this study we
summarize the stereo shower parameters measurements, especially X_{max}
measurements. The sensitivity limit
... More
Presented by Yulia FEDOROVA
on
4 Jul 2007
at
08:54
It has been claimed (Szensmark, 2007, and others) that observed correlations
of terrestrial cloud cover with 'the cosmic ray intensity' are casual. The
possibility arises, therefore of a connection between cosmic ray intensity and
Global Warming. If true, the implications would be very great.
An examination of the situation is made.
Presented by Prof. Arnold WOLFENDALE
on
7 Jul 2007
at
09:42
There are two kinds of relations between cosmic ray research and investigations of
space weather effects. Since energetic particles in space and low energy cosmic rays
interact with materials of the satellite and airplane systems as well as with the
atmosphere, monitoring of the changes of flux of cosmic particles especially during
solar flares, space storms and geomagnetic disturbances is imp
... More
Presented by Dr. Karel KUDELA
on
6 Jul 2007
at
17:55
We consider a generalized statistical model for the production process of cosmic
rays. This model takes into account temperature distribution of sources and yields
Tsallis statistics for cosmic ray energy spectrum. Results are compared with the
experimental data.
Presented by Dr. Zbigniew WLODARCZYK
on
5 Jul 2007
at
10:30
Cosmic ray showers that trigger the IceTop surface array generate high energy muons
that are measured by the IceCube in-ice detector. The large surface and underground
area of this 3-dimensional instrument at completion guaranties significant statistics
for shower energy up to about 1 EeV. Since the number of muons is sensitive to the
type of the primary cosmic ray nucleus these events can be
... More
Presented by Dr. Chihwa SONG
on
6 Jul 2007
at
09:06
One of the severe limitations in detecting neutrino signals from nuclear reactors
is that the copious cosmic ray background imposes the use of a time veto upon the
passage of the muons to reduce the number of fake signals due to muon-induced
spallation neutrons. For this reason neutrino detectors are usually located
underground, with a large overburden. However there are practical limitations
... More
Presented by Dr. Edgar CASIMIRO LINARES
on
9 Jul 2007
at
14:45
As a prototype for the AMS-02 experiment, the AMS-01 particle spectrometer was flown
on the
Space Shuttle Discovery in near earth orbit for a ten day mission in June 1998.
Concerning the
identification of positrons, AMS-01 was limited to energies below 3 GeV due to the
vast proton
background and the characteristics of the subdetectors. In order to extend the
sensitivity towards
higher ener
... More
Presented by Prof. Stefan Schael SCHAEL
on
9 Jul 2007
at
11:50
Simulations of ultra high energy showers that may be generated by different
primaries and observed with space detectors are performed. A special driver is
developed which enables to treat neutrino as a primary particle in the
framework of the traditional codes (AIRES, CORSIKA). Possibilities of the TUS
detector employment for ultra high energy neutrino studies are discussed.
Presented by Mr. Jorge COTZOMI
on
4 Jul 2007
at
14:45
The first flight of the Cosmic Ray Energetics And Mass (CREAM) balloon experiment
flew for a record breaking 42 days from McMurdo Station in Antarctica and utilized a
Calorimeter, a Transition Radiation Detector, and a Timing Charge Detector to measure
charge and energy. Galactic cosmic ray propagation models make predictions that fit
current low energy spectra. With the high energy data colle
... More
Presented by Taylor CHILDERS
on
4 Jul 2007
at
14:45
The dominant background for observations of gamma-rays in the energy region above 50
GeV with Imaging Atmospheric Cherenkov telescopes are cosmic-ray events. The images
of most of the cosmic ray showers look significantly different from those of
gamma-rays and are therefore easily discriminated. However, a small fraction of
events seems to be indistinguishable from gamma-rays. This constit
... More
Presented by Dr. Gernot MAIER
on
6 Jul 2007
at
14:45
Gamma rays have long been recognized as a uniquely powerful probe of the existence, origin, and nature of cosmic
rays beyond the solar system. The unprecedented sensitivity and resolution of GLAST should for the first time
confirm the presence of cosmic rays in Local Group galaxies today, and in all galaxies throughout the history of
cosmic star formation. We show that GLAST should detect,
... More
Presented by Prof. Brian FIELDS
on
5 Jul 2007
at
10:42
Nearly ten years after the discovery of the supernova remnant RX
J0852.0-4622 ("Vela Jr.") with ROSAT in 1998, many important parameters of
the remnant are still largely uncertain. Distance estimates range between
200 pc and 1-2 kpc, with correspondingly different estimates on the time
and type of the supernova explosion. We present the application of our
kinetic theory of cosmic ray accelera
... More
Presented by Prof. Heinrich J. VOELK
on
7 Jul 2007
at
09:18
We calculate the flux of neutrinos generated by the propagation of
ultra-high energy nuclei over cosmological distances. The propagation takes into
account the interactions with cosmic background radiations including the CMB
and the most recent estimates of higher energy (infra-red, optical, and ultra violet)
backgrounds. We assume that the composition of ultra-high energy cosmic rays
(UHECRs
... More
Presented by Dr. Nicolás BUSCA
on
9 Jul 2007
at
13:17
L. I. Dorman (1,2), O. A. Danilova (3), M. I. Tyasto (3), N. G. Ptitsina (3), G.
Villoresi (4), N. Iucci (4) and M. Parisi (4)
(1) Israel Cosmic Ray Center affiliated to Tel Aviv University,
Technion and Israel Space Agency, Israel; (2) IZMIRAN, Troitsk, Russia; (3)
SPbFIZMIRAN, St. Petersburg, Russia; (4) Dipartimento di Fisica "E. Amaldi",
Università "Roma Tre", Rome, Italy
I
... More
Presented by Prof. Lev DORMAN
on
6 Jul 2007
at
14:45
The H.E.S.S. stereoscopic Cherenkov telescope system has observed the
Crab nebula since January 2004 with the complete four telescope array.
The stable signal from this pulsar wind nebula (PWN) has been used to
verify the performance and calibration of the instrument because of its
high flux compared to the H.E.S.S sensitivity.
These observations allow us also to study the radiation mechan
... More
Presented by Dr. Bruno KHÉLIFI
on
6 Jul 2007
at
11:06
The Zero Degree Detector (ZDD) is a new instrument that has been used in
accelerator exposures to measure the angular dependence of secondary
particles produced in fragmentation experiments. The ZDD uses two identical
layers of pixelated silicon detectors that make coincident measurements over
the active area of the instrument. The angular distribution of secondary particle
produced in n
... More
Presented by Dr. Mark CHRISTL
on
9 Jul 2007
at
14:45
GRAPES-3 experiment employs a high-density array of scintillators and a
large area tracking muon telescope. The GRAPES collaboration is being
expanded with addition of several major facilities. These include a
Cerenkov telescope and low frequency dipole array for the measurement of
shower energy. Addition of several modules of muon telescopes to cover a
larger area, expansion of the scintilla
... More
Presented by Prof. Sunil GUPTA
on
10 Jul 2007
at
12:29
The Alpha Magnetic Spectrometer (AMS), to be installed on the International Space
Station, will provide data on cosmic radiations in a large range of rigidity from 0.5
GV up to 2 TV. The main physics goals in the astroparticle domain are the anti-
matter and the dark matter searches.
Observations and cosmology indicate that the Universe may include a large amount of
unknown Dark Matter. It sh
... More
Presented by Dr. Sylvie ROSIER-LEES
on
10 Jul 2007
at
10:42
The Telescope Array(TA) experiment will investigate the origin of the ultrahigh
energy cosmic rays (UHECRs).
This experiment is a hybrid observation of an air shower array and fluorescence
telescopes installed in Utah, USA.
We finised deploying about 500 Surface Detectors(SDs) for AS array to our site in
winter of 2006-2007,
and start SD operation from April 2007.
Effective area of this arr
... More
Presented by Dr. SHUNSUKE OZAWA
on
6 Jul 2007
at
14:45
The construction of the fluorescence detectors (FDs) of the
Telescope Array (TA) experiment will be completed in June 2007,
and the first observation with the full configuration is planned
in summer in this year. In this paper, we describe the development
of the data acquisition (DAQ) system for the TA FD observations.
The DAQ system of each TA FD station is comprised of 16 CPUs:
13 fo
... More
Presented by Dr. Hisao TOKUNO
on
6 Jul 2007
at
14:45
Project GRAND, an array of proportional wire chambers with muon identification, is used to examine the
decrease in ground level muon counting rate during the Forbush decrease event of September 11, 2005.
Data are presented and compared to that of other cosmic ray muon and neutron monitor detectors.
GRAND's angular resolution capabilities allows a directional study of the Forbush decrease.
Presented by Prof. John POIRIER
on
6 Jul 2007
at
09:18
Both, Super-Kamiokande-I and SNO have reported a day night asymmetry that, after
statistics and systematics are accounted for, is consistent with zero. Nevertheless,
the Kamiokande values of 2.1% is sizable and, at least in sign, consistent with
theoretical expectations. Taking into account in a simplified, yet realistic way the
internal structure of the Earth, we present new analytical and nu
... More
Presented by Dr. Daniel SUPANITSKY
on
9 Jul 2007
at
14:45
The unknown flux of prompt atmospheric neutrinos presents a challenging background to
searches for extra-terrestrial neutrinos in high-energy detectors. Uncertainties in this flux
will weaken the power of the detector to place constraints on other expected signals. A
new likelihood analysis, using the full information present in event arrival directions and
energy will be presented, which
... More
Presented by Gary HILL
on
9 Jul 2007
at
14:45
An application of absorption effect of the CR neutron component to the
estimation of snow-water equivalent is considered in this work. The primary CR
variations, changes of the atmospheric pressure and humidity concentration in
bedding surface are discussed as influence on the accuracy of the obtained
results. Monitoring of the snow-cover during several seasons demonstrated an
efficiency
... More
Presented by Dr. Viktor YANKE
on
6 Jul 2007
at
14:45
Basing on the EAS simulations with CORSIKA we investigate the lateral distributions
of electrons with a fixed energy in large showers. We show how these distributions
scale with electron energy, with air density and/or shower age. We fit some
analytical functions to describe them in an easy way.
This work is necessary when reconstructing the shower parameters from the light
images obtained
... More
Presented by Prof. Maria GILLER
on
4 Jul 2007
at
14:45
A new small array of cherenkov detectors is deployed in Tehran, 1200 m
above sea level. This array contains of four tanks full of distilled water with
diameter of 60 cm and height of 120 cm. The effective area of each tank is
about 0.6 . They are used to detect the air showers and to record the arrival
time of the secondary particles. We have collected about 200000 EAS in 1894 h
of obser
... More
Presented by Ms. Farzaneh SHEIDAEI
on
6 Jul 2007
at
14:45
Moliere simultaneous distribution between the deflection angle and the lateral
displacement is derived by applying numerical Fourier transforms on the
solution for frequency distribution acquired through Kamata-Nishimura
formulation of Moliere theory. The differences of our result from that under the
gaussian approximation and the basic properties of our distribution are
investigated clo
... More
Presented by Prof. Takao NAKATSUKA
on
4 Jul 2007
at
14:45
We discuss a general scheme of the optics and electronics read out as well
as preliminary test results of a detector prototype for the space fluorescence
telescope TUS (FD-TUS). The mirror of this prototype is coupled to an 8 by 8 pixel
camera. Each of the 64 pixels is read by one PMT of 13 mm diameter (Hamamatsu model
R1463) . The optics design is a multi-hexagonal segmented telescope with fo
... More
Presented by Dr. Humberto SALAZAR
on
6 Jul 2007
at
14:45
The HESS, MAGIC and VERITAS experiments are now fully operational
and are detecting and discovering a large number of high-energy gamma-ray
sources. This is a good time to work on the design of the next generation of IACT
experiments.
We estimate the limiting angular resolution and detection area for an
array of 3 large-aperture IACTs. We consider an idealized IACT system in order to
under
... More
Presented by Dr. Viatcheslav BUGAEV
on
6 Jul 2007
at
14:45
Recently, ground-based very high-energy gamma-ray astronomy achieved a remarkable
advancement in the development of the observational technique for the registration
and study of gamma-ray emission above 100 GeV. Construction of telescopes of
substantially larger size than the currently used 12 m class telescopes can
drastically improve the sensitivity of ground-based detectors for gamma rays o
... More
Presented by Dr. Alexander KONOPELKO
on
9 Jul 2007
at
14:45
The use of the radio-detection technique in a wide area cosmic-ray detector requires
autonomous antenna stations, in terms of power feeding, triggering and data
transmission. A
prototype has been tested at the Nançay Radio Observatory (France).
It uses the broadband (1-200 MHz) active dipoles installed on the CODALEMA
experiment (see other contributions in this conference), together with a s
... More
Presented by Dr. Benoit REVENU
on
6 Jul 2007
at
14:45
We present a summary of AMANDA results obtained in searches for neutrinos from Gamma-Ray Bursts (GRBs).
Using simulations, we show how the IceCube detector, which is currently being constructed at the South Pole, will
improve the sensitivity of the search. In order to improve the prospects for detections of gamma-ray dark bursts, as
well as core collapse Supernovae (SNe), we discuss a novel
... More
Presented by Dr. Marek KOWALSKI
on
6 Jul 2007
at
14:45
We discuss the prospect of detecting a spectral break in the gamma-ray
spectra of blazars due to the extragalactic background light in the near
to mid-IR. A measurable break in the TeV spectra could arise from the
drop in the EBL density above ~ 1um. This change in the spectral index
is mediated by the ratio of the near to mid-IR density of EBL. A detection
of such a spectral feature co
... More
Presented by Mr. Asif IMRAN
on
6 Jul 2007
at
14:45
Observations of PKS 2155-304 with the CANGAROO-III imaging atmospheric
Cherenkov telescope were performed for 5 nights from July 28 to August 2 in
2006, just after H.E.S.S. reported that this target object was at a strong active
state. Signal exceeding 6 sigma significance level was detected in the effective
live time of 15.0 hours using three-fold steroscopic data set. Obtained time
ave
... More
Presented by Ms. Yukiko SAKAMOTO
on
6 Jul 2007
at
14:45
In association with the large solar flare of April 15th 2001, the Chacaltaya
neutron monitor observed an 8.2 sigma enhancement of the counting rate
between 13:51 and 14:24 UT. Since the enhancement was observed from 11
minutes before the GLE, solar neutrons must be involved in this enhancement.
Comparing with the Yohkoh Soft X-ray Telescope images with the observed
particle time profi
... More
Presented by Prof. Yasushi MURAKI
on
4 Jul 2007
at
10:30
The radio technique for the detection of cosmic particles has seen a major
revival in recent years. New and planned experiments in the lab and the
field, such as GLUE, Anita, Codalema, LOPES and LOFAR as well as
sophisticated Monte Carlos experiments have produced a wealth of new
information. Radio emission of ultra-high energy cosmic particles offers a
number of interesting advantages. Since
... More
Presented by Dr. Heino FALCKE
on
5 Jul 2007
at
17:55
We have detected Cherenkov light from air showers with Geiger-mode
APDs (G-APDs). G-APDs are novel semiconductor photon-detectors
which offer several advantages compared to conventional
photomultiplier tubes in the field of air shower detection. Folded
with the Cherenkov spectrum the response of G-APDs is up to a
factor of three higher if compared with classical
photomultipliers. Moreover th
... More
Presented by Mr. A. Nepomuk OTTE
on
9 Jul 2007
at
11:42
The increasing number of reports on the gamma-ray detection from thunder clouds and
lightenings indicate that charged particles are accelerated by the strong electric fields
associated with the thunder phenomena. In order to search for high-energy radiation
from winter thunder clouds in the Japan sea coast areas, we have set up an autonomous
radiation detection system at Kashiwasaki, Niigata p
... More
Presented by Mr. Teruaki ENOTO
on
7 Jul 2007
at
10:42
The study of Ultra High Energy Cosmic Rays represents one of the most
challenging topic in this field. The interaction of primary particles with
atmospheric nuclei produces a huge Extensive Air Shower together with
isotropic emission of UV fluorescence light and highly directional Cherenkov
photons, that are reflected/diffused isotropically by the impact on the Earth's
surface or on h
... More
Presented by M. C. MACCARONE
on
4 Jul 2007
at
14:45
The MAGIC telescope has observed very high energy gamma-ray emission from the AGN 1ES
2344+514. A gamma-ray signal corresponding to an 11 sigma excess and an integral flux
of (2.38+-0.30)*10^-11 cm^-2 s^-1 above 200 GeV has been obtained from 23.1 hours of
data taking between 2005 August 3 and 2006 January 1. The data confirm the previously
detected gamma-ray emission from this object during a
... More
Presented by Dr. Robert WAGNER
on
6 Jul 2007
at
14:45
Detection of very high energy gamma-rays from the BL Lac object PG 1553+113 with the MAGIC telescope
The MAGIC telescope has observed very high energy gamma-ray emission from the BL Lac
object PG 1553+113 in 2005 and 2006 at an overall significance is 8.8 sigma in 18.8h.
The light curve shows no significant flux variations on a daily time-scale. The flux
level during 2005 was, however, significantly higher compared to 2006. The
differential energy spectrum between ~90 GeV and 500 GeV is well
... More
Presented by Dr. Robert WAGNER
on
9 Jul 2007
at
10:30
We have developed a method for determining ICME (Interplanetary coronal
mass ejection) geometry from galactic cosmic ray data recorded by the ground-
based muon detector network. The cosmic ray density depression inside the
ICME, which is the cause of a Forbush decrease, is represented as an
expanding cylinder based on a theoretical model of the cosmic ray particle
diffusion. ICME geometr
... More
Presented by Dr. Takao KUWABARA
on
4 Jul 2007
at
14:45
We have a plan to apply CALET (CALorimetric Electron Telescope) to make
observations of high energy cosmic rays, electrons, gamma-rays, and nuclei, on
the International Space Station (ISS). The detector of CALET consists of an
imaging calorimeter (IMC) and a total absorption calorimeter (TASC). We have
been developing front end circuits for the IMC and TASC. We also made a scale
model (1
... More
Presented by Dr. Yuki SHIMIZU
on
4 Jul 2007
at
14:45
Development of Gigahertz Analog Memory for Front-End Electronics of Imaging Air Cherenkov Telescopes
The night sky light is one of the major components of background for imaging air
Cherenkov telescopes. It disturbs images of air shower and makes both the
gamma/hadron separation and the angular resolution worse. For example, The
CANGAROO-III electronics consists of charge ADCs and multi-hit TDCs. In using charge
ADCs, we have to delay the signal from PMTs until the trigger signal input to ADC
... More
Presented by Mr. Taku MIZUKAMI
on
9 Jul 2007
at
14:45
We have been developing the CALET instrument, which is proposed
to be launched on the Japanese Experiment Module (JEM), Exposed
Facility (EF) of the ISS.
CALET consists of an imaging calorimeter (IMC) and a total absorption
calorimeter (TASC). The role of IMC is identification of the incident
particle by imaging the shower tracks with scintillating fibers.
TASC is
used for observing the t
... More
Presented by Dr. yusaku KATAYOSE
on
4 Jul 2007
at
14:45
The observation of trans-iron nuclei in galactic cosmic rays (Z30) requires a high
performance cosmic ray detector telescope with a very large exposure area because of
their extremely low fluxes. It is realized by the use of solid-state track detector
of CR-39, which has an advantage of easy extension of exposure area. The verification
of mass and nuclear charge identifications with CR-39 s
... More
Presented by Mr. Satoshi KODAIRA
on
4 Jul 2007
at
14:45
A promising method for the detection of UHE neutrinos is the Lunar Cherenkov
technique, which utilises Earth-based radio-telescopes to detect the coherent
Cherenkov radiation emitted when one of these particles interacts in the outer
layers
of the Moon. The LUNASKA project aims to overcome the technological
limitations of
past experiments to utilise the next generation of radio-telescopes
... More
Presented by Mr. Clancy JAMES
on
7 Jul 2007
at
10:30
There are small differences in both ionization energy loss and catastrophic
energy loss between positive and negative muons, which are usually neglected
in most Monte Carlo simulations. These small differences can be amplified when
measuring the charge ratio underground, where the total energy loss between
the surface and the measurement is significant. Calculations of these effects
fo
... More
Presented by Dr. Maury GOODMAN
on
9 Jul 2007
at
14:45
Many astrophysical models predict a diffuse flux of high-energy neutrinos from active
galactic nuclei and other extra-galactic sources. At muon energies above 1 TeV, the
upward-going muon flux induced by neutrinos from active galactic nuclei is expected
to exceed the flux due to atmospheric neutrinos. We have performed a search for this
astrophysical neutrino flux by looking for upward-going m
... More
Presented by Molly SWANSON
on
5 Jul 2007
at
12:35
The AMANDA-II data collected during the period 2000-03 have been analysed in a search
for a diffuse flux of high-energy extra-terrestrial neutrinos from the sum of all sources in
the universe. With no excess of events seen, an upper limit on an E-2 flux of E2 Phi < 8.8
x 10-8 GeV cm-2 s-1 sr-1 was obtained. The astrophysical implications of this bound and
of others obtained for specific mo
... More
Presented by Gary HILL, Jessica HODGES, Kotoyo HOSHINA
on
5 Jul 2007
at
09:35
We present preliminary results of measuring the direction of the anisotropy
vector of cosmic ray intensity. The measurements were made with the Carpet
air shower array of the Baksan Neutrino Observatory. The anisotropy vector
direction is determined by analyzing the distribution of time delays of the
shower signal detected by distant detectors of the array relative to the array’s
centr
... More
Presented by Dr. Alexander LIDVANSKY
on
10 Jul 2007
at
08:42
The values of the spectral indices of the cosmic ions below the knee energy
band are of notable importance for a quantitative account of the characteristic
of the knee and the ankle of the differential energy spectrum of the cosmic
radiation. Present available measurements of proton and helium spectral
indices below the knee energy interval from a variety of experiments are
examined. Acc
... More
Presented by Dr. Antonio CODINO
on
6 Jul 2007
at
11:45
Recent development in the analysis techniques used by the Milagro
collaboration had resulted in the discovery of an extended TeV
gamma-ray source in the Cygnus region of the Galaxy. The new source
MGRO J2019+37 has been detected at median energies of 12 TeV. In
addition to this extended source, new TeV gamma-ray sources have been
discovered at the same median energies when more data was analy
... More
Presented by Mr. Aous ABDO
on
7 Jul 2007
at
11:06
H.E.S.S. observations of the old-age (more than 10000 yrs; about 0.5 deg diameter) composite SNR W28
reveal TeV emission situated at its northeastern and southern boundaries. The northeastern TeV source is
in an
area where W28 is interacting with a dense molecular cloud, containing OH masers, local radio and X-ray
peaks. The southern TeV sources are found in a region occupied by several HI
... More
Presented by Dr. Gavin ROWELL
on
6 Jul 2007
at
14:45
Since the new generation of imaging atmospheric Cherenkov telescopes
came online with the commissioning of the four telescopes of the
H.E.S.S. experiment in 2004, the number of known extragalactic gamma-
ray emitters in the very high energy (VHE) domain has more than doubled.
All of the sources detected so far are active galactic nuclei and all
but one belong to the class of BL Lac objects. T
... More
Presented by Mr. Martin RAUE
on
9 Jul 2007
at
09:06
The extreme synchrotron BL Lac object PKS 0548-322 has been observed with the High Energy Stereoscopic System (H.E.S.S) array of atmospheric-Cherenkov telescopes. The observations were performed between October 2004 and December 2006 for a total exposure of nearly 25 hours live-time.
We will report the HESS detection and present a spectral energy distribution of this object using a quasi-simultan
... More
Presented by Dr. Bruno KHELIFI
on
6 Jul 2007
at
14:45
The H.E.S.S. telescope has detected a new very high energy gamma-ray point-like
source, HESS J0632+058. It is the first point-like source detected by H.E.S.S.
without any obvious counterpart. The excess lies in a region where interaction
between the Monoceros supernova remnant and the Rosette Nebula may occur. The energy
spectrum of the observed gamma-rays is well described by a power law of i
... More
Presented by Mr. Armand FIASSON
on
4 Jul 2007
at
11:30
The giant radio galaxy M87 was observed at GeV/TeV gamma-ray energies with the
H.E.S.S. (High Energy Stereoscopic System) Cherenkov telescopes in the years
2003-2006. The observations confirm M87 as the first extragalactic TeV gamma-ray
source not of the blazar type (first indications of a signal were reported by the
HEGRA collaboration earlier). The TeV gamma-ray flux from M87 as measured wit
... More
Presented by Dr. Matthias BEILICKE
on
10 Jul 2007
at
08:42
Motivated by recent detections of pulsar wind nebulae in very-high-energy (VHE) gamma
rays, a systematic search for VHE gamma-ray sources associated with energetic pulsars
was performed,
using data obtained with the H.E.S.S. (High Energy Stereoscopic System) instrument.
The search for VHE gamma-ray sources near the pulsar PSR J1718-3825 revealed the new
VHE gamma-ray source HESS J1718-385. We
... More
Presented by Svenja CARRIGAN
on
6 Jul 2007
at
14:45
The low-frequency peaked BL Lac (LBL) object BL Lacertae was observed with the MAGIC telescope from August to
December 2005 (22.2 hrs), and from July to September 2006 (26.0 hrs). A very high energy (VHE) gamma-ray
signal was discovered with a 5.1 sigma excess in the 2005 data. Above 200 GeV, an integral flux of approximate by
3% of the Crab flux was measured. The differential spectrum between
... More
Presented by Mr. Masaaki HAYASHIDA
on
9 Jul 2007
at
09:30
Gamma-families were sampled for Pamir altitude (600g/cm2) by MC0 model with
PCR spectra and composition proposed by KASCADE. Comparison of the
calculated and Pamir experimental data on the gamma-families characteristics
( energy spectra of particles, summary energy spectra of particles and intensity
of families) shows contradiction between them
Presented by Dr. V.G. DENISOVA
on
9 Jul 2007
at
10:30
The nearby dwarf spheroidal galaxy Draco with its high mass to light ratio
is a promising target for indirect dark matter (DM) searches. It is
located at a distance of about 82 kpc, at the edge of the Milky Way. The
dwarf galaxy is enclosed by a DM halo where the DM particle may annihilate
and produce an observable gamma-ray flux.
Among the different DM particle candidates the lightest supers
... More
Presented by M. RISSI
on
10 Jul 2007
at
11:18
It is shown that EAS longitudinal development has a critical point where an
equilibrium between the main hadronic component
and the secondary electromagnetic one is broken. This results in a change of slope in
quasi-power law function Ne(Eo).
The latter leads to a knee in the EAS size spectrum at primary energy of about 100
TeV/nucleon at sea level.
Presented by Dr. Yuri STENKIN
on
9 Jul 2007
at
11:35
Radio electric field strengths associated with extensive air shower can be
evaluated at large impact parameter with analytical expressions. Such a
theoretical tool is most valuable in the present stage of development of the
radio detection technique when the capabilities of the latter for comic-ray
physics are under investigations. It provides a manageable tool which can help
in devising
... More
Presented by Thierry GOUSSET
on
6 Jul 2007
at
14:45
The scale and scope of the physics studied at the Auger Observatory offer significant
opportunities for original outreach work. Education, outreach and public relations of
the Auger collaboration are coordinated in a separate task whose goals are to
encourage and support a wide range of education and outreach efforts that link
schools and the public with the Auger scientists and the science of
... More
Presented by Prof. Gregory SNOW
on
4 Jul 2007
at
14:45
The balloon-borne Cosmic Ray Energetics And Mass (CREAM) investigation is
designed to make direct measurements of high energy cosmic-ray particles at
the top of the atmosphere. The Silicon Charge Detector (SCD) provides charge
measurements of all primary particles from protons to iron nuclei. As the SCD is
mounted above the calorimeter, albedo particles backscattered from the
calorimeter
... More
Presented by J. YANG
on
4 Jul 2007
at
14:45
Energy spectra of hadron cascade showers produced by the cosmic ray muons travelling
through water and the muon integral spectra underwater at the depth up to 4 km are
calculated with two models of muon inelastic scattering on nuclei, the recent hybrid
model (two-component, 2C) as well as the well-known generalized
vector-meson-dominance (GVMD) model for the comparison. The 2C model involv
... More
Presented by Prof. Akeo MISAKI
on
9 Jul 2007
at
14:45
The effect of energetic solar protons on the middle atmosphere (20-80 km )
chemical composition during SPE 13 December, 2006 has been studied. The
solar proton spectra were obtained from the neutron monitors, balloons and
spacecraft data. One-dimensional time-dependent model (Fadel et al., 2006,
ASR, 38, p.1881-1886) has been used to calculate the production and loss of
minor atmospheric
... More
Presented by Dr. Andrey KIRILLOV
on
6 Jul 2007
at
14:45
At low energies, cosmic-ray nuclei experience the adiabatic limit where their
intensity becomes proportional to their kinetic energy per nucleon, independent
of the diffusion tensor and interstellar spectrum. Low-energy electrons, on the
other hand, do react to changes in the diffusion tensor and are therefore ideal
probes of its spatial- and rigidity dependence. To construct a diffusion t
... More
Presented by Prof. Renier BURGER
on
9 Jul 2007
at
08:42
IceCube data acquisition system is capable of recording information about all photons
registered by its photomultiplier tubes for up to 13 microseconds for each sensor
with high precision. The time resolution of 3 ns and charge resolution of 30% of all
1 photoelecton pulses within each sensor’s event record is achieved. The first
atmospheric neutrino analysis did not take full advantage of t
... More
Presented by Dr. Dmitry CHIRKIN
on
6 Jul 2007
at
14:45
We consider the effect of pre-existing turbulent fluctuations
in the fluid upstream of a propagating hydromagnetic
shock wave, in the limit of high enough Alf\'en mach
number that the magnetic field stresses can be neglected.
We find the expected effects on transverse diffusion, and
show that particles can be readily accelerated up to the
knee in the spectrum at a perpendicular shock.
... More
Presented by Prof. Jack (Randy) JOKIPII
on
5 Jul 2007
at
13:17
Voyager 1 observations at the termination shock and in the
heliosheath revealed new phenomena which required rethinking
of some of our established paradigms. Very important among the new
factors is the temporal and probably spatial variations
which produce a number of effects which affect the
energetic-particle spectra, anisotropies and their
time variations observed at Voyager1.
... More
Presented by Prof. Jack (Randy) JOKIPII
on
10 Jul 2007
at
12:29
It is known from long ago that solar energetic charged particles, driven by the
geomagnetic field, are able to produce ionization at different altitudes of the
terrestrial atmosphere. Moreover, they can initiate catalytic cycles for the ozone
depletion, involving NOx (N+NO+NO2) and HOx (H, OH, HO2) components.
Nevertheless, only in recent years it was possible to compare chemical models
... More
Presented by Dr. MARISA STORINI
on
6 Jul 2007
at
12:53
In order to investigate the effects of the fluorescence energy error distributions on
the determination of the ultra high energy cosmic ray (UHECR) spectrum we developed a
Monte Carlo simulation of fluorescence telescopes using the HiRes and Auger
telescopes as examples. We show that the energy error distribution (EED) for this
kind of detector cannot be adequately represented by Gaussian or
... More
Presented by Mr. Washington, Jr. CARVALHO
on
4 Jul 2007
at
14:45
The effects of electric thunderstorms on the electromagnetic and muon
components of the cosmic ray secondary flux were studied during severe
storms in 2004 and part of 2005 analyzing the variations of the counting rates
shown in the upper and lower scintillators of the muon telescope installed in
Mexico City. Results show that for positive configurations of the electric field
soft compon
... More
Presented by Mr. Jesús ALVAREZ CASTILLO
on
6 Jul 2007
at
14:45
We discuss discrimination techniques and their quantitative efficiency that allow the
separation of high energy electron/photon and muon primaries originated in cosmic ray
extensive air showers impinging the ground. The experimental setup used in this study
is detailed elsewhere in this volume (Sanchez et al.). Several approaches are
analyzed, including track timing, footprint characterization
... More
Presented by Mr. Federico SANCHEZ
on
6 Jul 2007
at
14:45
Electron injection process at high Mach number collisionless quasiperpendicular shock
waves is investigated by means of one-dimensional electromagnetic particle-in-cell
simulations. We find that energetic electrons are generated through the following two
steps: (1) electrons are accelerated nearly perpendicular to the local magnetic field
by shock surfing acceleration at the leading edge of th
... More
Presented by Mr. Takanobu AMANO
on
7 Jul 2007
at
08:42
KASCADE-Grande, located at Forschungszentrum Karlsruhe, is a multi
detector experiment for the measurement of extensive air showers induced by primary
cosmic rays in the energy range of $10^{14}-10^{18}$ eV. With its
0.5 km$^2$ large field detector, in combination with the muon detectors
of the KASCADE array, it allows the reconstruction of both the total
electron and muon numbers, which are
... More
Presented by Dr. - -
on
4 Jul 2007
at
14:45
The COSPIN/KET experiment on board the Ulysses spacecraft has been
observing the flux of 3-30 MeV and also higher energy electrons in the inner
heliosphere (radial distances > 5.2 AU) since its launch in 1990. These
observations have indicated the presence of low-energy electrons with a
strong anisotropy off the equatorial plane as far as 2.2 AU from Jupiter. This
was observed during Uly
... More
Presented by Prof. Marius POTGIETER
on
9 Jul 2007
at
14:45
Field programmable gate arrays (FPGAs) are playing an increasing role in
DAQ systems in cosmic ray experiments due to their high speed and
integration and their low cost and low power comsumption. In this paper we
describe in detail the new electronics and data acquisition system based on
FPGA boards of the extensive air shower detector array built in the Campus of
the University of Puebla. T
... More
Presented by Dr. Luis VILLASENOR
on
6 Jul 2007
at
14:45
The Cosmic Ray Energetics And Mass (CREAM) instrument is a balloon-borne
experiment designed to measure the composition and energy spectra of cosmic
rays of charge Z = 1 to 26 up to an energy of ~ 10^15 eV. CREAM had two
successful flights on long-duration balloons (LDB) launched from McMurdo
Station, Antarctica, in December 2004 (CREAM-I) and December 2005. CREAM-I
achieves a substantial me
... More
Presented by Dr. Hoseok AHN
on
4 Jul 2007
at
08:42
Strong signals of energetic neutrons associated with the solar flare of 7
September 2005 were detected by using the Solar Neutron Telescopes located at
Mt. Chacaltaya in Bolivia and Mt. Sierra Negra in Mexico, Neutron Monitors
located at Mt. Chacartaya and Mexico City. The observed profiles
indicate a continuous emission of neutrons. In this paper, we present the
results of combined anal
... More
Presented by Dr. Takashi SAKO
on
4 Jul 2007
at
09:30
We study non-thermal emissions by relativistic electrons from supernova
remnants(SNRs) in the presence of small-scale random and large-scale regular magnetic
fields. We extend our pure jitter and inverse Compton emission models (Ogasawara et
al. 2006) and construct the emission models with regular magnetic fields. We apply
them to the multi-wavelength data of TeV gamma-ray sources SNRs RX J1
... More
Presented by Dr. Tatsuo YOSHIDA
on
6 Jul 2007
at
14:45
In order to fit observational data of solar particle charge states, two different
models
have been developed, to study the evolution of charge during their source
acceleration. :(1) on basis to high energy electron loss and capture cross
sections, from laboratory experiments in atomic and ionized hydrogen gases,
under the assumption of an interaction process of two different populat
... More
Presented by Prof. JORGE PEREZ-PERAZA
on
4 Jul 2007
at
14:45
Since 1996, energetic hydrogen and helium atoms (ENAs) have been identified and their
fluxes are monitored by the High-Energy Suprathermal Time-of-Flight sensor (HSTOF) of
the Charge, Element, and Isotope Analysis System (CELIAS) on the Solar and
Heliospheric Observatory (SOHO) near the Lagrangian point L1. ENAs, neutralized via
charge transfer reactions, move along ballistic trajectories una
... More
Presented by Martin HILCHENBACH
on
10 Jul 2007
at
11:30
In this contribution we discuss the possibility of using the observations by
GLAST of standard gamma sources, as the Crab Nebula or Vela and some
selected AGNs, to calibrate the Imaging Air Cherenkov detectors and improve
their energy resolution. Results of the calibration technique can possibly be
used to discriminate between VHE gamma-rays emitted by the Nebula and by
the inner pulsar
... More
Presented by Dr. Denis BASTIERI
on
9 Jul 2007
at
14:45
Observations with H.E.S.S. in 2004-2005 revealed a new source of very high-energy
(VHE) gamma-rays above 100 GeV -- HESS J1825-137 -- extending mainly to the south of
the energetic pulsar PSR B1823-13. While the direction of the VHE gamma-ray emission
with respect to the pulsar is similar to that of the asymmetric X-ray PWN G18.0-0.2
in this system, the RMS extension of HESS J1825--137 is >0.2
... More
Presented by Dr. Stefan FUNK
on
6 Jul 2007
at
09:06
The Balloon-borne Experiment with a Superconducting Spectrometer (BESS)
was flown eight times from Lynn Lake, Manitoba, Canada between 1993 and
2002. The performance of the instrument was improved with essentially each
successive flight, and precise spectral measurements of cosmic-ray hydrogen
and helium isotopes were made during different phases of the solar
modulation. This paper prese
... More
Presented by Eun-Suk SEO
on
4 Jul 2007
at
14:45
The Crab is a standard calibration source for TeV gamma ray astronomy.
Its energy spectrum extends beyond 10s of TeV, however, an open question
is does the spectrum cutoff and at what energy. We present new results from
Milagro analysis of the energy spectrum of the Crab nebula up to 100 TeV
with good statistical determination. A robust algorithm was developed to
estimate the energies of gam
... More
Presented by Prof. Gaurang YODH
on
6 Jul 2007
at
11:18
The Cosmic Ray Energetics and Mass (CREAM) balloon experiment had two successful
flights in 2004/05 and 2005/06. It was designed to perform energy measurements from
a few GeV up to 1000 TeV, taking advantage of different detection techniques. The
first instrument, CREAM-I, combined a transition radiation detector (equipped with an
array of proportional tubes and an acrylic Cherenkov device) w
... More
Presented by Dr. Paolo MAESTRO, Riccardo ZEI
on
6 Jul 2007
at
12:17
In the fluorescence detection of ultra high energy ($\gtrsim 10^{18}$ eV) cosmic
rays, it is assumed that the number of emitted fluorescence photons is proportional
to the energy deposited in air by shower particles. We have performed measurements of
the fluorescence yield in atmospheric gases excited by electrons over a wide energy
range. AIRFLY has collected data between 1 and 3 MeV at a Va
... More
Presented by Dr. Lorenzo CAZON
on
10 Jul 2007
at
12:17
Normalized cumulative particle fluence plots are very useful for characterizing the
variability of interplanetary suprathermal and energetic particle fluxes on various
time scales. For some applications it is practicable to describe the deviations of
annual fluence plots from straight lines by a single parameter (the Kolmogorov or K
parameter), and then check the dependence of that parameter o
... More
Presented by Péter KIRÁLY
on
5 Jul 2007
at
09:06
Extremely high energy (EHE) cosmic rays are expected to interact with cosmic
microwave photons and generate EHE neutrinos (>10PeV).
The IceCube telescope can detect the EHE neutrinos due to its large effective volume,
although the expected flux is much lower than the huge flux of atmospheric background
muons at lower energies. Therefore, reconstruction of the track geometry and
especially t
... More
Presented by Dr. David BOERSMA
on
9 Jul 2007
at
14:45
We have observed cosmic-ray electrons from 10GeV to 1TeV with PPB-BETS by a long duration balloon flight
using Polar Patrol Balloon (PPB) in Antarctica. The observation was carried out for 13 days at an altitude of 35 km
in January 2004. The detector is an imaging calorimeter composed of scintillating-fiber belts and plastic
scintillators inserted between lead plates. The geometrical factor
... More
Presented by Dr. Kenji YOSHIDA
on
4 Jul 2007
at
11:30
The Solar Neutron Telescope (SNT) at Mt. Sierra Negra in Mexico (19.0°N, 97.3°W) is
taking data since June of 2004. A solar neutron event was registered by this SNT,
associated with the flare of September 7 of 2005, at the minimum phase of solar cycle
23. In this work we calculate the energy spectrum for this solar neutron event, using
the attenuation model by Dorman & Valdés-Galicia (J. G
... More
Presented by Dr. Luis Xavier GONZÁLEZ
on
4 Jul 2007
at
14:45
A recently proposed novel technique for the detection of cosmic rays with arrays of
Imaging Atmospheric Cherenkov Telescopes is applied to data from the High Energy
Stereoscopic System (H.E.S.S.). The method relies on the ground based detection of
Cherenkov light emitted from the primary particle prior to its first interaction in
the atmosphere. The charge of the primary particle (Z) can be es
... More
Presented by Mr. Rolf BUEHLER
on
4 Jul 2007
at
10:54
Recently, advances in VHE instrumentation have made the discovery of many new,
predominantly Galactic, sources possible. Of these, a significant number can be
identified as pulsar wind nebulae. It has long been known that pulsars can drive
powerful winds of highly relativistic particles. These winds end in a termination
shock from which high-energy particles with a wide spectrum of energies em
... More
Presented by Svenja CARRIGAN
on
7 Jul 2007
at
12:41
Energy spectra and chemical composition of the primary cosmic ray nuclei for energies
higher than 1 PeV are obtained mainly from measurements of intensities and various
properties of extensive air showers. Additional and importent data from the study of
gamma ray families are available in addition. In bouth cases we have informations
from the range of very high fluctuations. An importent fact
... More
Presented by Prof. Janusz KEMPA
on
4 Jul 2007
at
12:05
The Ursa Major (UM) cluster of UHECRs consists of 5 events in the combined
HiRes-AGASA sample above 10 EeV which are consistent with coming from a single point
source, with little magnetic deflection. The probability of finding the cluster of 4
highest energy events by chance is about 2 10^-3; the probability that the 5th low
energy event is a chance correlation, given the size of the low ene
... More
Presented by Prof. Glennys FARRAR
on
4 Jul 2007
at
13:17
The dependence of the intensity of muon bundles detected at the Earth's surface by
means of the coordinate-tracking detector DECOR on the angle between muon arrival
direction and geomagnetic field vector (pitch angle) has been analysed. It is found
that muon bundle intensity decreases with the increase of the transverse component of
the magnetic field in comparison with calculations performed
... More
Presented by Dr. Igor YASHIN
on
6 Jul 2007
at
11:06
The IceCube neutrino observatory, currently under construction at the South Pole,
offers a novel environment to search for particles beyond the Standard Model. With
IceCube nearly 20% complete it is currently the largest neutrino telescope. The large
instrumented volume and relatively clear glacial ice allows for the improvement of
detection limits (in the absence of discovery) on many types o
... More
Presented by Dr. Alexander OLIVAS
on
9 Jul 2007
at
14:45
As described in a paper (S.Torii et al) of this conference, CALET is
a versatile detector for exploring high energy universe by observing
gamma rays (>20 MeV), electrons (>GeV) and other charged particles
(>100GeV). It is planned to be on board the JEM (Japanese
Experiment Module, Kibo) of the International Space Station. We
study its basic performance by M.C simulations.
Th
... More
Presented by Prof. katsuaki kasahara KASAHARA
on
9 Jul 2007
at
14:45
GAW is a research and development project to test the feasibility of a new
generation of Imaging Atmospheric Cherenkov Telescopes suitable for large
field observations.
GAW is defined as an array of three identical imaging Cherenkov telescopes
posed at the vertexes of a quasi-equilateral triangle, 80m side. Each telescope
is equipped with a refractive optics consisting of a 2.13m diameter
... More
Presented by Dr. Maria Concetta MACCARONE
on
9 Jul 2007
at
11:06
The ANTARES telescope is being built in the Mediterranean Sea. The detector
consists of a 3D array of photomultipliers (PMTs) that detects the Cherenkov
light induced by the muons produced in neutrino interactions. Since the
neutrino fluxes from point-like sources are expected to be small, it is of
the utmost importance to take advantage of the ANTARES accurate pointing
power (angular resolut
... More
Presented by Mr. Juan Antonio AGUILAR SÁNCHEZ
on
5 Jul 2007
at
08:53
New SPHERE-2 detector basic parameters are described.
New calorimetric method is used to study the primary cosmic rays energy spectrum and
chemical composition at energy region 10 PeV - 1 EeV. The method is practically
independent of the particle interaction model. Results of CORSIKA simulation of
detector are presented.
Lifted by tied balloon to the 1 km altitude detector will detect EAS
... More
Presented by Dr. Dmitry CHERNOV
on
6 Jul 2007
at
14:45
The thin target mode of the FLASH (Fluorescence in Air from Showers)
experiment was conducted at SLAC. The aim was to measure the total
and spectrally resolved fluorescence yield of charged particles
traveling through air to better than 10%. The setup consisted of a
15.24 cm thick gas volume which was viewed by two PMT detectors
each equipped with 15 remotely interchangeable narrow band
... More
Presented by Dr. Petra HUENTEMEYER
on
6 Jul 2007
at
14:45
Having high-resolution UV spectra produced from EAS fluorescence, one can
determine in a more accurate way the effects of atmospheric attenuation of
these signals by including Rayleigh, Mie-scattering as well as resonance
absorption inside the atmosphere. For this reason, we developed an
experimental setup for emulating the air-fluorescence using high-resolution
spectroscopy in the UV r
... More
Presented by Mr. Stavros MALTEZOS
on
6 Jul 2007
at
14:45
Extensive air showers of cosmic rays ultra-high energy without muon
component registered by the Yakutsk array have been analysed. Among them
we found some clusters and these clusters correlate with pulsars. The problem
of origin showers without muons and the chemical composition of cosmic rays
are discussed.
Presented by Dr. Alexei MIKHAILOV
on
7 Jul 2007
at
13:17
The phenomenon of alignment of most energetic structures of gamma-ray-hadron families
found in mountain and stratospheric X-ray - emulsion chamber experiments cannot be
explained without a coplanar particle generation with large transverse momenta in
hadron interactions at superhigh energies. A phenomenological model, which makes it
possible to simulate such interactions, is presented. Differe
... More
Presented by Prof. Rauf MUKHAMEDSHIN
on
6 Jul 2007
at
14:45
According to the time variations of the cosmic ray (CR) rigidity spectrum
parameters the dynamic processes are researched in the interplanetary space,
and it is found that the variation of electromagnetic characteristics of
heliosphere begins before the sporadic phenomena on the Sun. In particular, it
is shown that before the sporadic phenomena the decrease of generation of
local polariz
... More
Presented by Dr. Olga KRYAKUNOVA
on
4 Jul 2007
at
14:45
Several experimental works demonstrate the possibility of observation of shadows of
the Moon and the Sun for the mean energy of primaries higher than 1 TeV. Calculations
are presented to demonstrate the feasibility of Moon shadow observations for mean
primary energies in the region 0.5-1 TeV in a muon detector operating under the
Pyramid of the Sun at Teotihuacan, Mexico. Due to the relatively
... More
Presented by Dr. Varlen GRABSKI
on
9 Jul 2007
at
14:45
Astrophysical neutrinos in the EeV range (particularly those generated by the
interaction of cosmic rays with the microwave background) promise to be a valuable
tool to study astrophysics and particle physics at the highest energies. Much could
be learned from temporal, spectral, and angular distributions of ~100 events, which
could be collected by a detector with ~100 km^3 effective volume i
... More
Presented by Mr. Justin VANDENBROUCKE
on
7 Jul 2007
at
11:18
The South Pole Acoustic Test Setup (SPATS) has been built to evaluate the
acoustic characteristics of the Antarctic ice in the 10 to 100 kHz frequency range
so that the feasibility and specific design of an acoustic neutrino detection array
at South Pole can be evaluated. SPATS consists of three vertical strings that
have been deployed in the upper 400 meter of the Antarctic ice cap in Jan
... More
Presented by Ms. Freija DESCAMPS
on
9 Jul 2007
at
14:45
Using our new Monte Carlo code REAS2, geosynchrotron radio emission from
extensive air showers can now be calculated on the basis of individual high
quality CORSIKA-simulated showers. We present an analysis of the radio
emission properties predicted by REAS2, with particular focus on shower to
shower fluctuations and primary particle composition effects which can now
for the first time b
... More
Presented by Dr. Tim HUEGE
on
5 Jul 2007
at
11:30
For the conditions of KASCADE-Grande the lateral particle density at about 500 m
distance from the shower core S(500) has been shown by detailed simulation studies to
be an approximate energy estimator, being nearly independent of the mass of the
primary particle. This report presents some features of the S(500) observable of EAS
registered with the KASCADE-Grande array installed at Forschungs
... More
Presented by Dr. Iliana BRANCUS
on
6 Jul 2007
at
13:18
The Cern Neutrinos to Gran Sasso (CNGS) project aims to produce a high
energy, wide band muon neutrino beam at Cern and send it towards the INFN
Gran Sasso National Laboratory (LNGS). Its main goal is the observation of the
tau neutrino appearance.
The beam started its operation in August 2006: a total amount of $7.6~10^
{17}$ protons were delivered to the target.
The LVD detector, instal
... More
Presented by Gabriella SARTORELLI
on
10 Jul 2007
at
10:30
The Moon based observation of cosmic rays must be part of the complete
program at the forefront of the space science and technology of the set of Moon
based observatories that will operate on the Moon in the next few decades.
When compared with the cost of a dedicated vehicle and its launch, the
installation of CR experiments on the Moon, in a suitable equipped location,
compensates for
... More
Presented by Prof. Piero SPILLANTINI
on
6 Jul 2007
at
14:45
The central array of the ARGO detector at the YangBaJing Cosmic Ray Laboratory
(4300 m a.s.l., Tibet, P.R. China) has been put into operation for physics runs.
It is made of 130 identical sub-units of 12 RPCs each ('cluster') covering a
surface of about 5800 m**2 with 92% active area. Signals are picked-up by external
electrodes of small size, thus allowing the sampling of EAS with high space
... More
Presented by Dr. Daniele MARTELLO
on
9 Jul 2007
at
09:42
A new Muon Spaceweather Telescope for Anisotropies dedicated to spaceweather forecast
is presently under construction in Greifswald (MuSTAnG), Germany. MuSTAnG in its
present configuration consists of 8 m2 (2 x 4 m2) of scintillator plates in 2
layers. Each scintillator plate has a size of 0.25 m2 and is connected via
wavelength-shifting fibres to a photomultiplier unit with integrated high-v
... More
Presented by Prof. Rainer HIPPLER
on
4 Jul 2007
at
14:45
When high-energy cosmic rays impinge on a dense dielectric medium, radio waves
are produced through the Askaryan effect. At wavelengths comparable to the
typical longitudinal size of showers produced by Ultra-High Energy cosmic rays
or neutrinos, radio signals are an extremely efficient way to detect these
particles [1]. These can be detected using the Westerbork Synthesis Radio
Telescope (WS
... More
Presented by Olaf SCHOLTEN
on
7 Jul 2007
at
12:53
Multiwavelength observations provide valuable information to estimate the physical parameters of AGN emission
models. Since blazars show a strong flux variability, it is important to derive these physical parameters in the
different states in order to understand the acceleration mechanism and in the jet. So far simultaneous blazar
observations in X-rays and VHE gamma-rays could only be perfo
... More
Presented by Mr. Masaaki HAYASHIDA
on
6 Jul 2007
at
14:45
The yield of fluorescence photons in an extensive air shower allows
the observer to determine the number of shower particles by measuring
the number of photons produced. As the systematic uncertainties in
both ground array and fluorescence detectors improve our need to
better understand this calibration is required. Additionally, as more
sensitive fluorescence detectors observe further into t
... More
Presented by Dr. Kevin REIL, Dr. Petra HUENTEMEYER
on
10 Jul 2007
at
09:06
Photon yields in moist air are measured with Sr90 beta source
and compared with those in dry air.
Considerable reduce in the photon yields is found due to water vapor.
Since the ultrahigh energy cosmic ray observatories (HiRes, Auger, TA)
with fluorescence technique on ground are at high altitude,
the effect of the water vapor may be negligible.
However, for the experiments from space like
... More
Presented by Dr. Naoto SAKAKI
on
6 Jul 2007
at
14:45
By the solar flare, a large number of solar protons are usually accelerated into
high energies. When the intensities of solar protons are very strong, they are
observed as a phenomenon, the Ground Level Enhancement (GLE). However,
it is used to be reported in the cosmic ray conferences how much percentage
they increased in comparison with the flux of the galactic cosmic rays.
In order t
... More
Presented by Prof. Yasushi MURAKI
on
7 Jul 2007
at
08:42
VERITAS is a new atmospheric Cherenkov imaging telescope array to detect
very high energy gamma rays above 100 GeV. The array is located in
southern Arizona, USA, at an altitude of 1270m above see level.
The array currently consists of four 12 m telescopes, structurally
resembling the Davis-Cotton design of the Whipple 10 m telescope.
The VERITAS focal plane instruments are equipped with
... More
Presented by Dr. Tomoyuki NAGAI
on
9 Jul 2007
at
14:45
Forbush decreases in relation to CME related shocks and solar wind
disturbances.
P.L. VERMA
Department of Physics Govt. Vivekanand P.G. College Maihar Distt. Satna (M.P.)
India
ABSTRACT
Coronal mass ejections (CMEs) are the most energetic events in the
heliosphere and are widely recognized as being responsible for production of
large disturbances in solar wind, t
... More
Presented by Dr. PL VERMA
on
4 Jul 2007
at
14:45
We presented a statistical study of major Forbush decreases during the last decades,
using cosmic ray data from ground based detectors -- neutron monitors and a muon
detector. We show that, in addition to typical event (e.g., September 2005), there
are several unusual Forbush decreases (e.g., November 2004), which depict unexpected
features:
(1) the recovery time of a Forbush decrease stron
... More
Presented by Dr. Ilya USOSKIN
on
5 Jul 2007
at
13:17
It is well known that energy spectrum of solar energetic particles (SEP),
observed by ground based neutron monitors and muon telescopes (in high
energy region; the transfer to the space from the ground observations is made
by the method of coupling functions, see in [1], Chapter 3), and by detectors on
satellites and space-probes (in small energy region) changed with time very
much (usua
... More
Presented by Prof. Lev DORMAN
on
4 Jul 2007
at
14:45
Shell-type Supernova remnants (SNRs) have long been known to harbour a population of
ultra-relativistic particles, accelerated in the Supernova shock wave by the
mechanism of Diffusive shock acceleration. Experimental evidence for the existence of
electrons up to energies of ~100 TeV was first provided by the detection of hard
X-ray synchrotron emission as e.g. in the shell of the young SNR SN
... More
Presented by Dr. Stefan FUNK
on
6 Jul 2007
at
14:45
The future of ground based gamma ray astronomy lies in large arrays of Imaging
Atmospheric Cherenkov Telescopes (IACT) with better capabilities: lower energy
threshold, higher sensitivity, better resolution and background rejection. Currently,
designs for the next generation of IACT arrays are being explored by various groups.
We have studied possible configurations with a large number of tele
... More
Presented by Ms. Saeeda SAJJAD
on
10 Jul 2007
at
10:54
Although SNRs are theoretically considered to be the most plausible candidates for
the acceleration of cosmic-ray hadrons up to PeV energies, no observations have
succeeded in definitely specifying those objects so far.
Since accelerated electrons have difficulty producing very high-energy gamma rays
with energies above 100 TeV via bremsstrahlung or inverse Compton scattering, it can
be an ef
... More
Presented by Mr. Takashi SAKO
on
6 Jul 2007
at
13:17
The Tibet air shower array, which has an effective area of 37,000 square meters and
is located at 4300 m in altitude, has been observing air showers induced by cosmic
rays with energies above a few TeV.
We have a plan to add a large muon detector array to it for the purpose of increasing
its sensitivity to cosmic gamma rays in the 100 TeV energy region by discriminating
them from cosmic-ray h
... More
Presented by Mr. Takashi SAKO
on
4 Jul 2007
at
14:45
GAW, acronym for Gamma Air Watch, is a Research and Development
experiment in the TeV regime, whose main goal is to explore the feasibility of
large field of view Imaging Atmospheric Cherenkov Telescopes. GAW is an array
of three relatively Cherenkov telescopes (2.13 m diameter) which differentiate
from the existing and presently planned projects for two main features: the
adoption of a
... More
Presented by Dr. giancarlo CUSUMANO
on
9 Jul 2007
at
10:54
We report on the results of a preliminary study of the GCR-induced photon
luminescence of the Moon using the Monte Carlo program FLUKA. The model of
the lunar surface is taken to be the chemical composition of soils found
at various landing sites during the Apollo and Luna programs, averaged over
all such sites to define a generic regolith for the present analysis. This
then becomes the
... More
Presented by Dr. Thomas WILSON
on
6 Jul 2007
at
14:45
The CREAM instrument is a balloon-borne detector designed to measure the cosmic-ray
spectrum in the 1-1000TeV energy range, with good charge resolution from protons to
iron (Z = 1 to 26). The CREAM instrument has had two successful flights, both from
McMurdo Station, Antarctica. CREAM-I was flown in the 2004-2005 Antarctic summer
campaign and CREAM-II in 2005-2006, with a combined flight durat
... More
Presented by Mr. Samuel MOGNET
on
4 Jul 2007
at
14:45
High-energy gamma-ray sources are inherently nonthermal, multiwavelength objects.
With the launch of the Gamma-ray Large Area Space Telescope (GLAST) in late 2007, the
GLAST Large Area Telescope (LAT) Collaboration invites cooperative efforts from
observers at all wavelengths. Among the many topics where multiwavelength studies
will maximize the scientific understanding, three stand out. (1)
... More
Presented by Dr. Jennifer CARSON
on
9 Jul 2007
at
14:45
The Large Area Telescope (LAT, 30 MeV < E < 300 GeV) aboard the Gamma-ray Large Area
Space Telescope (GLAST), scheduled to launch in late 2007, promises a factor of ~30
increase in sensitivity over its predecessor, EGRET. It is expected that the LAT will
detect over a thousand blazars in its first year, enabling the first detailed
population studies of these gamma-ray sources. The LAT’s sens
... More
Presented by Dr. Jennifer CARSON
on
6 Jul 2007
at
14:45
The Gamma ray Large Area Space Telescope (GLAST) is the next-generation
high energy gamma-ray astronomy mission, scheduled for launch in Fall
2007. The observatory comprises two instruments. The Large Area Telescope
(LAT) will survey the sky in the energy range from 20 MeV to >300 GeV,
while the GLAST Burst Monitor (GBM) will monitor gamma-ray bursts and
other transients in the 10 keV to 25 M
... More
Presented by Mr. JOHANN COHEN-TANUGI
on
9 Jul 2007
at
14:45
The latest GLE event (70th since 1942) was registered using neutron monitor
net on December 13, 2006. The response of neutron monitors shows a sharp
anisotropy of solar particle flux with direction close to the acceptance cone of
MEPhI muon hodoscopes (Moscow). Analysis of the enhancement in muon
ground level intensity measured by means of muon hodoscope URAGAN (MEPhI,
Moscow) is present
... More
Presented by Dr. Dmitry TIMASHKOV
on
6 Jul 2007
at
10:42
A method is presented for the identification of high-energy neutrinos from
gamma ray bursts by means of a large-scale neutrino telescope.
The procedure makes use of a time profile stacking technique of observed
neutrino induced signals in correlation with satellite observations.
By selecting a rather wide time window, a possible difference between the
arrival times of the gamma and neutrino
... More
Presented by Dr. Nick VAN EIJNDHOVEN
on
5 Jul 2007
at
13:08
Spectral properties of some GRB with presence of high energy component
within RHESSI, HETE and
SWIFT t90 intervals are discussed. In some cases the temporal profiles of GRB
in low and high
energy bands are similar but in some cases they are different and maxima are
not coincide.
We found the same type GRB in CGRO database too – for example, GRB930131.
Moreover, for some GRB
from
... More
Presented by Dr. Leonid MIROSHNICHENKO
on
6 Jul 2007
at
14:45
The spatial distribution of galactic cosmic rays in the heliosphere
at solar maximum of Cycles 21, 22 and 23 are studied using a one
dimensional model of the cosmic ray transport equation. We investigated
the radial intensity gradients from 1 AU to the distant heliosphere and
interpreted the data from IMP8, Voyagers 1/2, Pioneer 10 and balloon
experiment BESS. In our model we considered
... More
Presented by Oscar G. MORALES-OLIVARES
on
9 Jul 2007
at
14:45
We use a diffusive model for the propagation of Galactic cosmic rays to estimate the
charged meson production in interactions with protons of the interstellar medium.
Cosmic ray nuclei from proton to iron are considered and the corresponding
contribution to the neutrino secondary flux produced as a result of spallation is
also estimated. The contribution from nearby Galaxies to the all sky neu
... More
Presented by Cinzia DE DONATO
on
9 Jul 2007
at
14:45
Based on the cosmic-ray (CR) data currently available, we estimate the gas
density, diffusion coefficient, and their spacial gradient in both the longitudinal
and the latitudinal directions in the Galaxy. Applying our model on the three
dimensional CR propagation for various CR observables such as stable nuclear
components, isotopes, antiprotons, diffuse gamma-rays, we present analytical
... More
Presented by Prof. Toru SHIBATA
on
5 Jul 2007
at
11:30
The new galactic gamma-source neutron star 2129+47XR is detected at energy >0.8TeV
with flux (0.19\pm0.9)×10^{-12}cm^{-2}s^{-1} and index of the integral spectrum is kγ
= -1.05\pm0.10.
Cygnus X-3 is peculiar X-ray binary system discovered about 40 years ago. The system
has been observed throughout wide range of the electromagnetic spectrum. It is one of
the brightest Galactic X-ray sources
... More
Presented by Vera Yurievna SINITSYNA
on
6 Jul 2007
at
14:45
GAW proposes a new approach for the detection and measurement of the Cherenkov light
produced by GeV/TeV gamma rays traversing the Earth atmosphere which imposes specific
requirements on the electronics design. The focal surface of the GAW telescope
consists of a matrix of multi-anode photomultipliers. The large number of active
channels (of the order of 104) makes it basically a large UV sens
... More
Presented by Pedro ASSIS
on
9 Jul 2007
at
14:45
By using Egret data, considering a gamma ray flux for Virgo suppercluster and a
detailed analysis on our postulates, with a new methode a gamma ray flux in
Coma direction reasults.
some analogy between the works has made, is done.
a flux index for Coma direction gamma rays has resulted which is in the favor of
our information from Coma supercluster.
Presented by Mrs. Pantea DAVOUDIFAR
on
6 Jul 2007
at
14:45
The Gamma-ray Large Area Space Telescope (GLAST) will be launched less than a year
from now, and its Large Area Telescope (LAT) is expected to discover scores to
hundreds of gamma-ray pulsars. This poster discusses which of the over 1700 known
pulsars, mostly visible only at radio frequencies, are likely to emit >100 MeV
gamma-rays with intensities detectable by the LAT. The main figure of mer
... More
Presented by Mrs. Marianne LEMOINE-GOUMARD
on
7 Jul 2007
at
12:05
Young rotating neutron stars (pulsars) are considered as strong sources of TeV
muon neutrinos, which are produced through the delta resonance in proton-
gamma photon interactions. In this presentation it is shown that the observed
upper limit of gamma ray fluxes from the young pulsars put limit on fluxes of
muon neutrinos from the sources.
Presented by Dr. Arunava BHADRA
on
6 Jul 2007
at
14:45
Recent results from the HESS gamma-ray telescope have shown the presence of both
a diffuse, extended flux of gamma rays above ~0.4 TeV and discrete sources in and
near the Galactic Centre. Here, we put forward a possible explanation in terms of the
diffusion of cosmic-ray protons from a succession of supernova remnants ( SNR ) in
the SgrA* region of the Galaxy plus a probable contribution from
... More
Presented by Prof. Anatoly ERLYKIN
on
4 Jul 2007
at
08:42
In this work we consider the situation in which the pulsar (and its nebula) is formed
inside or close to the high density regions of a molecular cloud. Recent models for
the gamma radiation of pulsar wind nebula try to include not only radiation processes
due to the injected leptons but also processes due to injection of relativistic
hadrons into the nebula. Hadrons accelerated during the life
... More
Presented by Dr. Hendrik BARTKO
on
6 Jul 2007
at
14:45
Measurements at 100 TeV and above are an important goal for the
next generation of high energy $\gamma$-ray astronomy experiments.
In fact, the high energy end of $\gamma$-ray source spectra might
provide clear discrimination between electron and hadron
processes, thus allowing the identification of cosmic "PeVatrons",
the sites of Cosmic Rays production and acceleration.
The most natural
... More
Presented by Dr. Giuseppe DI SCIASCIO
on
6 Jul 2007
at
14:45
The Solar Tower Atmospheric Cherenkov Effect Experiment (STACEE) is an atmospheric
Cherenkov telescope that uses a large mirror array to achieve a relatively low energy
threshold. For sources with Crab-like spectra, at high elevations, the detector
response peaks near 100 GeV. Gamma-ray burst (GRB) observations have been a high
priority for the STACEE collaboration since the inception of the
... More
Presented by Alexander JARVIS
on
9 Jul 2007
at
12:53
The GLAST Large Area Telescope (LAT) is the next generation satellite experiment for
high-energy gamma-ray astronomy. It is a pair conversion telescope built with a
plastic anticoincidence shield, a segmented CsI electromagnetic calorimeter, and the
largest silicon strip tracker ever built. It will cover the energy range from 20 MeV
to more than 300 GeV, shedding light on many issues left open
... More
Presented by Frederic PIRON
on
10 Jul 2007
at
09:18
In this work we study the individual contribution to diffuse $\gamma$-ray
emission from the secondary products in hadronic interactions generated by
cosmic rays (CRs), in addition to the contribution of neutral-pions via
the decay into two gamma rays. For that purpose we employ the Monte
Carlo particle collision code DPMJET3.04 to determine the multiplicity
spectra of various secondary p
... More
Presented by Prof. Martin POHL
on
6 Jul 2007
at
09:54
The recent advances in TeV gamma-ray astronomy are largely due to the ability to
distinguish between extensive air showers generated by gamma rays and hadronic cosmic
rays. In this paper, we report on a method to distinguish electromagnetic air showers
from hadronic air showers in Tibet air-shower observation. An extensive Monte Carlo
simulation has been carried out and the secondary particle
... More
Presented by Mr. Ding CHEN
on
6 Jul 2007
at
14:45
We propose to provide a gamma-ray burst monitor (GBM) for the CALET mission to
monitor gamma-ray bursts (GRBs) simultaneously with the CALET main detector. The
major purpose is to derive a wide-band energy spectrum of GRB over an unprecedented 9
decades of energy (from a few keV to 10 TeV) in combination with the CALET tower
detector. Hence it is desirable to have the CALET-GBM covering an ene
... More
Presented by Dr. Kazutaka YAMAOKA
on
9 Jul 2007
at
14:45
Ongoing deep surveys of galaxy luminosity functions, spectral energy
distributions and backwards evolution models of star formation rates
can be used to calculate the past history of intergalactic photon
densities and, from them, the present and past optical depth of the
universe to gamma-rays. Stecker, Malkan & Scully have recently done
this calculation for pair-production in
... More
Presented by Dr. F. W. STECKER
on
9 Jul 2007
at
17:55
We calculate the production of gamma rays by cosmic ray interactions with the lunar
surface. We show that the major contribution comes from neutral pions produced in
proton interactions with the nuclei in the lunar surface while the electron
bremsstrahlung is a minor component contributing mostly at low energies. Our
calculations show a good agreement with the EGRET observations of the lunar a
... More
Presented by Dr. Igor MOSKALENKO
on
6 Jul 2007
at
14:45
In this contribution we will show our predictions for the intensity and the
angular distribution of the gamma-ray and neutrino emissions above the TeV as
should be originated from the hadronic scattering of cosmic rays (CR) with the
interstellar medium (ISM).
We simulated the spatial distribution of primary nuclei by solving numerically
the diffusion equation considering several models o
... More
Presented by Dr. Dario GRASSO
on
10 Jul 2007
at
12:29
Gamma-ray bursts (GRBs) are among the potential very-high-energy (VHE) gamma-ray
sources. VHE emission from GRBs is predicted by most GRB models. Despite its
generally fast-fading nature in many wavebands, the time evolution of any VHE
radiation is still not clear. The highest energy radiation from GRBs ever detected
firmly by any instrument was a 18 GeV photon coming from GRB 940217 detected
... More
Presented by Pak Hin TAM
on
6 Jul 2007
at
14:45
Recent observations have revealed the existence of an enormously
energetic ~ 10^61 erg AGN outburst in the Hydra A cluster of galaxies.
This outburst has produced cavities in the
intra-cluster medium, apparently supported by pressure from
cosmic rays. Here we argue that these particles are very
likely protons and nuclei. For a plausible
spatial distribution of the target gas, based on observ
... More
Presented by Wilfried DOMAINKO
on
6 Jul 2007
at
14:45
The millisecond pulsars in globular clusters can accelerate leptons at the shock waves
originated in collisions of the pulsar winds and/or inside the pulsar magnetospheres.
Leptons diffuse gradually through the globular cluster comptonizing stellar and
microwave background radiation. We calculate the GeV-TeV $\gamma$-ray spectra for
different models of injection of leptons and parameters of
... More
Presented by Dr. Wlodek BEDNAREK
on
6 Jul 2007
at
14:45
Open clusters are concentrations of dense matter and young stars. It is expected that
non-thermal processes play important role in these objects due to the observations of
non-thermal X-ray emission and directional coincidence with some uniEGRET sources. We
calculate the gamma-ray spectra expected from the open cluster Ber 87 assuming that
hadrons and leptons are accelerated inside this objec
... More
Presented by Dr. Wlodek BEDNAREK
on
6 Jul 2007
at
14:45
Charged Cosmic Rays are a huge background in any IACT measurement.
Traditional data analysis methods involve variables that try to characterize the
shape of the shower 2D pattern at the IACT focal plane. The Hillas parameters
are, in this context, widely used.
In this contribution an innovative method based on 3D variables, the angles
and the distances (impact parameters) in space between
... More
Presented by Prof. Mario PIMENTA
on
9 Jul 2007
at
14:45
The high energy ionizing radiation environment in the solar system consists of three
main sources: the radiation belts, galactic cosmic rays and solar energetic
particles. Geant4 is a Monte Carlo radiation transport simulation toolkit, with
applications in areas as high energy physics, nuclear physics, astrophysics or
medical physics research. In this poster, Geant4 applications to model and s
... More
Presented by Dr. Bernardo TOMÉ
on
4 Jul 2007
at
14:45
Imaging Air Cherenkov Telescopes (IACTs) detect the Cherenkov light flashes
of Extended Air Showers (EAS) triggered by VHE gamma-rays impinging on
the Earth's atmosphere. Due to the overwhelming background from hadron
induced EAS, the discrimination of the rare gamma-like events is rather
difficult, in particular at energies below 100 GeV. The influence of the
Geomagnetic Field (GF) on t
... More
Presented by Mr. S.C. COMMICHAU
on
9 Jul 2007
at
14:45
The experimental technique of fluorescence light observation is used in
current and planned air shower experiments that aim at understanding
the origin of ultra-high energy cosmic rays. In the fluorescence technique,
the geometry of the shower is reconstructed based on the correlation
between viewing angle and arrival time of the signals detected by the telescope.
The signals are compare
... More
Presented by Dr. Markus RISSE
on
4 Jul 2007
at
14:45
The most common way to simplify extensive Monte-Carlo simulations of air showers is
the thinning approximation. We study its effect on the physical parameters
reconstructed from simulated showers. To this end, we created a library of showers
simulated without thinning with energies from $10^{17}$~eV to $10^{18}$~eV, different
zenith angles and primaries. This library is publicly available. Var
... More
Presented by Mr. Grigory RUBTSOV
on
6 Jul 2007
at
14:45
It is generally believed that Forbush Decrease (FD) events happen
simultaneously over the globe of the Earth. However, there have been reports
on non-simultaneous FD events. We investigate the properties of non-
simultaneous FD events in order to determine what solar wind conditions lead
to global simultaneity of FD events.
We examined the hourly data of the Oulu Neutron Monitor (NM)
... More
Presented by Dr. Su Yeon OH
on
4 Jul 2007
at
14:45
We present the results of a study of the annual frequency distribution of cosmic ray
decreases (amplitude ≥ 3%) for five solar activity cycles (19 to 23), using Climax
neutron monitor hourly counting rate data. We confirm the main result of our earlier
study, on a similar topic, over a shorter time interval (cyles 20, 21, and 22) that
there is a notable gap in the distribution, near the maxi
... More
Presented by Prof. Harjit AHLUWALIA
on
4 Jul 2007
at
14:45
We study the spatial gradients of galactic cosmic rays in the inner heliosphere using
data from the Kiel Electron Telescope (KET) aboard Ulysses and the Cosmic Ray Isotope
Spectrometer (CRIS) aboard the Advanced Composition Explorer (ACE) for the time
period from 1997 to 2007. This covers the solar minimum in the A>0-solar magnetic
epoch, the solar magnetic reversal to an A<0-magnetic epoch at
... More
Presented by Mr. R. MÜLLER-MELLIN
on
7 Jul 2007
at
12:17
On the basis of neutron monitor world network data the GLE event of December 13, 2006
is studied. Taking into account the initial differential spectrum of galactic cosmic
rays, viewing cones of the detectors, integral multiplicity of secondary neutrons at
various latitudes and observation levels the GLE spectrum is estimated. It is noted
that at the Yakutsk station this event has also been reg
... More
Presented by Dr. Sergey STARODUBTSEV
on
6 Jul 2007
at
14:45
An update list of responses to relativistic solar particles and to particles
accelerated in interplanetary space to high energies (Kudela et al, Proc. 23rd
ICRC, Calgary, vol. 3, p.71-74, 1992) for the period 1966 until December 2006
as recorded by a high mountain neutron monitor with nominal vertical cut-off
rigidity ~ 4 GV is presented. Selected events and the specifics of high mountain
... More
Presented by Prof. Karel KUDELA
on
6 Jul 2007
at
14:45
The balloon-borne Cosmic Ray Energetics And Mass (CREAM) payload flew for a
record-breaking 42 days during the 2004/05 Antarctic season. The instrument
incorporates a tungsten/scintillating-fiber sampling calorimeter and graphite targets
to measure energies of nuclei. A finely segmented Silicon Charge detector (SCD)
located above the targets is used for charge measurements. The position of the
... More
Presented by Mr. Y. S. YOON
on
4 Jul 2007
at
08:54
The Galactic Plane is accessible to H.E.S.S. at longitudes up to 80
degrees through very low elevation observations.
The ability of H.E.S.S. to observe at elevations as low as 25 degrees
corresponding to an energy threshold of few TeV has been
already validated through observations of the blazar Mkn 421.
We report on H.E.S.S. data on the Galactic Plane up to the 80° longitude range
and w
... More
Presented by Dr. Arache DJANNATI-ATAÏ
on
7 Jul 2007
at
11:18
Scan-based observations of the Galactic plane and continuing
re-observations of known very-high-energy (VHE) gamma-ray sources with
the H.E.S.S. system of imaging atmospheric Cherenkov telescopes have
revealed a wide variety of new VHE objects. While in many cases these
objects can be associated with known sources in the X-ray, radio, or
optical wavebands, a subset of them currently have no o
... More
Presented by Dr. Karl KOSACK
on
6 Jul 2007
at
14:45
Clusters of galaxies, the largest gravitationally bound objects in the
universe, are expected to contain a significant population of hadronic
and leptonic cosmic rays. Potential sources for these particles are
merger and accretion shocks, starburst driven galactic winds and radio
galaxies. Furthermore, since galaxy clusters confine cosmic ray protons
up to energies of at least 1 PeV for a tim
... More
Presented by Dr. Wilfried DOMAINKO
on
9 Jul 2007
at
11:30
The shell-type supernova remnant RX J0852.0-4622 was detected in 2004 and re-observed
between December 2004 and May 2005 with the High Energy Stereoscopic System
(H.E.S.S.), an array of four Imaging Cherenkov Telescopes located in Namibia and
dedicated to the observations of gamma-rays above 100 GeV. The angular resolution of
< 0.1° and the large field of view of H.E.S.S. (5° diameter) are w
... More
Presented by Mrs. Marianne LEMOINE-GOUMARD
on
6 Jul 2007
at
14:45
The shell-type supernova remnant (SNR) RCW 86 - possibly associated with
the historical supernova SN 185 - was observed during the past three years with the
High Energy Stereoscopic System (H.E.S.S.), an array of four
atmospheric-Cherenkov telescopes located in Namibia.
The multi-wavelength properties of RCW 86, e.g. weak radio emission and North-East
X-ray emission almost entirely consist
... More
Presented by Mr. Stefan HOPPE
on
4 Jul 2007
at
12:29
In view of the discovery of HESS J1023-575 (discussed in a separate
presentation), we
examine other very high energy (VHE) gamma-ray
sources possibly associated with massive star clusters. Particle acceleration in
massive star forming regions can proceed at
the interface of two interacting winds or result from a collective process;
multiple
shock acceleration or MHD turbulence.
The gamm
... More
Presented by Dr. Alexandre MARCOWITH, Dr. Nukri KOMIN
on
6 Jul 2007
at
14:45
The High Altitude Water Cerenkov detector HAWC will be a powefull instrument to
survey the TeV sky. Mexico has proposed to locate this experiment in the Parque
Nacional Pico de Orizaba, between Citlaltepetl and Tliltepetl, host of the Large
Millimeter Telescope (LMT). The region has a sizeable technical infrastructure
related to the LMT and we recently studied a 4100m location in terms of i
... More
Presented by Dr. Alberto CARRAMINANA
on
9 Jul 2007
at
14:45
Presented by Prof. Masahiro TESHIMA
on
11 Jul 2007
at
10:30
Presented by Prof. Tom GAISSER
on
11 Jul 2007
at
14:30
Presented by Dr. Ralph ENGEL
on
11 Jul 2007
at
17:30
The southern part of the Pierre Auger Observatory is nearing completion in the
province of Mendoza, Argentina. The instrument has been used to take air
shower data at the highest energies since 2004. The energy threshold for high
quality shower data is about 3 10**18 eV for the surface array of particle
detectors (SD). The data of the Auger fluorescence telescopes (FD) enable
precise ev
... More
on
6 Jul 2007
at
14:45
The results from H.E.S.S. observations towards Westerlund 2 are presented. The
detection of very-high-energy gamma-ray emission towards the young stellar cluster
Westerlund 2 in the HII complex RCW49 by H.E.S.S. provides ample evidence that
particle acceleration to extreme energies is associated with this region. A variety
of possible emission scenarios will be reviewed, ranging from high-ener
... More
Presented by Mr. Martin RAUE
on
6 Jul 2007
at
14:45
Since about one decade, air shower simulations based on the hadronic interaction
models QGSJET and SIBYLL predict very similar results for the main observables. For
instance, the mean depth of the shower maximum Xmax agrees within 5% between the
different models and are in relative good agreement with the measurements. However
the number of muons at ground differs substantially between th
... More
Presented by Dr. Tanguy PIEROG
on
5 Jul 2007
at
10:42
We examine the impact of nonlinear diffusive shock acceleration on the TeV visibility
of SNRs. A dense molecular cloud near a SNR provides a good target for pp-collisions
leading to subsequent gamma ray emission through neutral pion decay. The intensity
and the spectral shape of this radiation is thus determined by the spectrum of
accelerated particles. This may become instrumental in distin
... More
Presented by Dr. Igor MOSKALENKO
on
7 Jul 2007
at
10:30
If taken into account, the transmission of the particle-scattering turbulence --in
addition to just the particles-- through the shock front can change the effective
compression ratio felt by the accelerating particles significantly from the
compression of the underlying plasma. This can lead to significantly harder energy
spectra than what are traditionally predicted assuming frozen-in turbule
... More
Presented by Dr. Joni TAMMI
on
4 Jul 2007
at
14:45
IceTop is an air shower array now under construction at the South Pole. It is
the surface component of IceCube, an observatory primarily focused on cosmic
neutrinos. When completed, IceTop will have approximately 500 square meters
of collecting area in the form of 160 separate ice Cherenkov detectors. These
detectors are sensitive to electrons, photons, muons and neutrons. With the
high
... More
Presented by Dr. Takao KUWABARA
on
4 Jul 2007
at
14:45
Short-period variations in the integral GCR fluence ( > 100 MeV) often observed
in neutron monitor data have also been seen by the High Sensitivity Telescope
(HIST) aboard the Polar spacecraft. Although HIST was designed to measure
radiation-belt electrons, it makes clean measurements of the integral GCR
fluence when Polar is outside the radiation belts. These measurements show
GCR varia
... More
Presented by Tamitha MULLIGAN
on
6 Jul 2007
at
09:42
Point-like excesses have been alternately claimed and refuted in the direction
of Cygnus X-3, BL-Lacertae objects, and others. We conduct a search for point-
like deviations from isotropy in the arrival direction of ultra-high energy cosmic
rays in the monocular data set collected by the High-Resolution Fly's Eye. We
find no evidence for point-like excesses and place a 90% c.l. upper l
... More
Presented by Ms. Malina KIRN
on
4 Jul 2007
at
14:45
Data from the High Resolution Fly's Eye detector that measures cosmic rays
with the fluorescence technique is used to set limits on the flux of tau
neutrinos in the energy range from 10^17 to 10^21 eV. This energy range is
particularly interesting as we expect a guaranteed flux of cosmogenic
neutrinos from the GZK mechanism.
Presented by Prof. Kai MARTENS
on
4 Jul 2007
at
09:06
We present results on the ultra-high energy cosmic ray spectrum as measued
by the High Resolution Fly's Eye Experiment. The spectrum is analyzed in
two different ways: monocular reconstruction and stereo reconstruction.
The monocular spectrum has the highest statistics while the stereo
spectrum has the best resolution.The monocular spectrum has a threshold of
.1 EeV while the stereo spectrum'
... More
Presented by Prof. Pierre SOKOLSKY
on
4 Jul 2007
at
08:42
The Track Imaging Cerenkov Experiment (TrICE) is an air Cerenkov telescope designed
to use a high resolution method for measuring cosmic-ray composition at TeV-PeV
energies. The method aims to separate the fast and compact direct Cerenkov signal
produced by primary cosmic ray nuclei in the upper atmosphere from the light produced
by the subsequent air shower cascade. Efficient discrimination
... More
Presented by Elizabeth HAYS
on
6 Jul 2007
at
12:41
We calculate the yield and flavor content of high energy neutrinos
produced in astrophysical sources with and without magnetic fields
varying their interaction depth.
We pay special attention to the multiple scattering of secondaries
on background photons as well as the direct production of neutrinos
in decays of charm mesons.
If multiple scattering of nucleons becomes important, the ne
... More
Presented by Dr. Ricard TOMAS
on
9 Jul 2007
at
13:05
Using data of the L3+Cosmics experiment, a preliminary measurement
of the muon multiplicity distribution is presented.
These are compared to Monte Carlo simulation results obtained with
the CORSIKA/QGSJET code. Below the "knee" of the primary spectrum
20% more muons are observed than expected.
Taking into account the uncertainty of the present primary
spectrum measurements, no abnormal phen
... More
Presented by Prof. Yuqian MA
on
5 Jul 2007
at
11:45
Perturbative QCD predicts that there should be a significant flux of
muons with high transverse momentum (p_T) produced in primary interactions
of high-energy cosmic-rays. These muons arise from the semileptonic decays
of heavy quarks, and from the decays of high p_T kaons and pions produced
in jets. These muons can be useful to study the cosmic-ray composition in
a pQCD framework.
... More
Presented by Dr. Spencer KLEIN
on
9 Jul 2007
at
14:45
The handling of solid-state track detector (SSTD) has been historically required for
a long period and many human powers to scan and analyze etch-pits produced on the
detector. Because a large area greater than a few m^2 detector is required to observe
ultraheavy nuclei in galactic cosmic rays, a high speed scanning system is
practically important to realize our observation. We have developed
... More
Presented by Mr. Satoshi KODAIRA
on
4 Jul 2007
at
14:45
The Pierre Auger Observatory is now ~80% completed with all of the fluorescence
detectors and 1300 tanks in operation. The exposure accumulated since January 2004
is ~ 5000 km^2 sr yr, approximately 3 times that reached by AGASA and about twice the
exposure of HiRes. The hybrid nature of the detector and unparalleled attention to
systematic uncertainties has allowed an accurate measurement o
... More
Presented by Dr. Alan A. WATSON
on
10 Jul 2007
at
17:25
We study the propagation of cosmic rays at the highest energies of different compositions and discuss the
implications for anisotropy studies of future UHECR observatories. The evolution of the horizon of cosmic rays as a
function of the energy is mass dependent: low and intermediate mass nuclei can only originate from very nearby
sources above a few 10^19 eV and the composition above 4.10^1
... More
Presented by Prof. Angela OLINTO
on
7 Jul 2007
at
11:18
We have developed a hybrid photo-detector (HPD) for the Ashra detector.
The HPD consists of a 6-inch electron tube and a multi-pixel silicon detector
followed by trigger decision ASIC circuits.
The advanced features of the silicon detector are as follows:
1. high resolution with 64 x 64 channels using bump bonding technique
2. high gain due to a thin dead layer and a large effective area
... More
Presented by Dr. Masataka MASUDA
on
9 Jul 2007
at
14:45
A key feature of the Pierre Auger Observatory is its hybrid design, in
which ultra high energy cosmic rays are detected simultaneously by
fluorescence telescopes and a ground array. The two techniques see air
showers in complementary ways, providing important crosschecks and
measurement redundancy. Much of the hybrid capability stems from the
accurate geometrical reconstruction it achieves, w
... More
Presented by Dr. Bruce DAWSON
on
4 Jul 2007
at
10:30
The long-term variation (modulation) of CR intensity is not exactly anti-parallel
to sunspot activity. In odd cycles, there is a large hysteresis loop (difference in
the evolution during the rising and falling phase of solar activity). In even
cycles, the loop is narrow. So far, only data for two odd cycles (cycle 19 and 21)
and two even cycles (20 and 22) were available and the above patt
... More
Presented by Dr. RAJARAM KANE
on
9 Jul 2007
at
14:45
The Goddard Medium Energy experiment on the IMP 8 spacecraft has made nearly
continuous observations of the near-Earth energetic particle environment from its
launch in October, 1973 until near present. We summarize several aspects of these
observations, including solar energetic particle events, CIR-associated events, and
cosmic ray modulations. In particular, we note that, as expected from
... More
Presented by Tycho VON ROSENVINGE
on
5 Jul 2007
at
12:53
Peculiarities in distribution of the Jovian electrons along the Earth's orbit based
on an extended set of observational data are investigated. It is shown that the
maximum in the electron intensity appears 243 days after the Earth-Jupiter
opposition. It corresponds to the IMF field time simultaneously covering the
Jupiter and the Earth. Through the charged particle flux the Jupiter forms 3
... More
Presented by Dr. Vladislav TIMOFEEV
on
9 Jul 2007
at
14:45
The IceCube Neutrino Detector is a cubic kilometer ice-Cherenkov detector being constructed in the deep ice under
the geographic South Pole. After a successful construction season ending in February 2007 IceCube consists of 22
strings and 26 IceTop stations with a total of 1424 Digital Optical Modules (DOMs) deployed at depths up to 2450m.
This together with the commissioning of the central
... More
Presented by Albrecht KARLE
on
5 Jul 2007
at
09:05
IceCube is a 1 km^3 neutrino observatory now being built at
the South Pole. In addition to its larger size, IceCube is also
designed to have smaller systematic errors than its AMANDA
predecessor. IceCube performance for showering ('cascade'-like)
events has been studied with LED and laser light sources.
The detector resolution for cascade position, energy and
direction has been studied
... More
Presented by Dr. Joanna KIRYLUK
on
9 Jul 2007
at
14:45
The calibration of the surface air shower array of IceCube - IceTop is based on
identifying and understanding the muon response of each IceTop tank. Special
calibration runs are carried out throughout the year and are supplemented with
austral season measurements with tagging telescope for vertical muons. The vertical
equivalent muon (VEM) charge value of each tank is determined and monitored
... More
Presented by Dr. Levent DEMIROERS
on
9 Jul 2007
at
14:45
Small air showers that trigger single or several IceTop stations usually have one or
several muons with energy high enough to reach the IceCube in-ice detector. In this work,
we first use the coincident events to calibrate the timing resolution between and
within the two detectors. Using muons tagged by IceTop single station triggers, which
usually contain a single high energy muon, we also cr
... More
Presented by Dr. Thomas GAISSER
on
9 Jul 2007
at
14:45
The chemical composition of Ultra-High-Energy (UHE) comic rays is one of unsolved
mysteries, and its study will give us fruitful information on the origin and
acceleration mechanism of UHE cosmic rays. Especially, a detection of UHE gamma-rays
by hybrid experiments, such as AUGER and TA, will be a key to solve these questions.
The characteristics of UHE gamma-ray showers have been studied on l
... More
Presented by Mr. Yoshimitsu WADA
on
4 Jul 2007
at
14:45
The Antarctic Impulsive Transient Antenna (ANITA) experiment may be the first
experiment to identify astrophysical neutrinos of energy greater than 10^18 eV
through the detection of radio Cherenkov pulses emitted by neutrino-induced particle
showers in the Antarctic ice. A Monte Carlo simulation has been developed to
determine the sensitivity and improve the event reconstruction capabilities o
... More
Presented by Brian MERCURIO
on
9 Jul 2007
at
14:45
This work is directed toward the experimental and theoretical investigation of
the ground level solar cosmic ray enhancements (GLE). Relativistic protons (>1
GeV) are generated in powerful flares more often than they are observed at
the Earth. Especially it concerns to observation at the middle latitudes.
Although recorded magnitudes of ground level enhancements are usually very
small at
... More
Presented by Dr. Olga KRYAKUNOVA
on
6 Jul 2007
at
14:45
A instrument to image medium energy gamma-rays is being designed for the
future NASA Advanced Compton Telescope (ACT) mission. This instrument
consists of a gas microwell imaging detector with an active detection volume of
approximately 1.6 m x 1.6m x 0.5m which is surrounded by a segmented
calorimeter. The use of the gas imager allows for the detection and tracking of
the recoil elect
... More
Presented by Dr. Jason LINK
on
9 Jul 2007
at
09:06
This paper presents the sidereal anisotropy of ~10 TeV galactic cosmic ray
(GCR) intensity observed by the Tibet Air Shower experiment. The observed sky-
map of the directional anisotropy clearly shows the large-scale feature
consisting of excess and deficit of the relative intensity. We note that the
observed angular separation between the excess and the deficit is ~120 deg,
which is muc
... More
Presented by Prof. M. TAKITA
on
10 Jul 2007
at
08:30
The CREAM (Cosmic Ray Energetics And Mass) data acquisition (CDAQ) system
showed excellent stability and robustness during the 2004/05 and 2005/06
Antarctic campaigns. The CREAM-III Calorimeter, scheduled to be launched in
December 2007, was calibrated at a CERN test beam in October 2006. During
the beam test, the CDAQ software, running on a non-flight Beam Test
Computer (BTC) system, c
... More
Presented by Prof. Eun-Suk SEO
on
4 Jul 2007
at
14:45
In neutrino astronomy, glacial ice or deep ocean water are used as
detector media. Typically, neutrinos are recognized by distinguishing
charged particles generated in neutrino interactions from atmospheric
muons, using in situ detectors recording time distributions and fluxes of
faint photon fields of Cherenkov radiation.
The IceCube collaboration has developed an empirical model descri
... More
Presented by Mr. Johan LUNDBERG
on
9 Jul 2007
at
14:45
Presented by Blanca GARCIA-GUTIÉRREZ, Martha ORTEGA-SOTO, Federico LAZARÍN-MIRANDA
on
7 Jul 2007
at
17:55
Radio receivers (RICE, AURA) have been deployed to detect impulsive emissions from
neutrino interactions in ice at South Pole. An alternative source of pulses is the
cores of cosmic ray induced air showers. AIRES and CORSIKA simulations suggest that
>10% of the primary cosmic ray energy enters the ice within 20 cm of the primary axis
impact point. The resulting 5-10 m cascade will make Askarya
... More
Presented by Dr. David SECKEL
on
10 Jul 2007
at
10:54
The Large Area Telescope (LAT) is one of the two instruments onboard the Gamma-ray
Large Area Space Telescope (GLAST), the next generation high-energy gamma-ray
telescope, to be launched in Fall of 2007. It is comprised of sixteen identical
towers in a four by four grid, each tower containing a silicon tracker and a CsI
calorimeter that together will give the incident direction of the pair-con
... More
Presented by Mrs. Claudia LAVALLEY
on
9 Jul 2007
at
14:45
PAMELA is a satellite-borne experiment designed to study the charged component of the
cosmic radiation of galactic, solar and trapped nature. The main scientific objective
is the study of the antimatter component of cosmic rays over a wide range of
energies. PAMELA is mounted on the Resurs DK1 satellite that was launched on June
15th 2006 from the Baikonur cosmodrome and is now on a semipolar
... More
Presented by Dr. Silvio ORSI
on
4 Jul 2007
at
14:45
PAMELA cosmic-ray detector is orbiting around the Earth on board the Resurs DK1
satellite since June 2006. The experiment is designed to study charged particles in
the cosmic radiation, being optimized in particular for antiprotons and positrons.
The core of the telescope is a magnetic spectrometer equipped with several detectors.
Six planes of silicon microstrip sensors are placed inside the
... More
Presented by Massimo BONGI
on
4 Jul 2007
at
14:45
Under the assumption the Neutralino as lightest supersymmetric particle
being the DM particle, studies of the evolution of Super Massive Black
Holes expected in the center of most galaxies predict the existance of
some 100-1000 Intermediate Mass Black Holes (IMBH) also in our galaxy
[Bertone et al. 2005].
Since IMBHs did not suffer major merging and barionic accretion, they can
have a very
... More
Presented by Dr. Michele DORO
on
9 Jul 2007
at
14:45
Within the Cold Dark Matter scenario of structure formation, assuming the dark matter
is composed by common candidates such as supersymmetric particles, the smallest bound
structures have masses as low as 10^-6. High-resolution N-body experiments have shown
that a large fraction of these small structures survive hierarchical clustering and
can be found within the halo of our own Galaxy.
These
... More
Presented by Dr. Lidia PIERI
on
10 Jul 2007
at
09:42
Relativistic outflows carrying large scale magnetic fields have large
inductive potential and may accelerate protons to ultra high energies.
We discuss a novel scheme of Ultra-High Energy Cosmic
Ray acceleration due to drifts in
magnetized, cylindrically collimated, sheared jets of powerful active galaxies.
We point out that a
positively charged particle carried by such a flow is in
... More
Presented by Mr. Maxim LYUTIKOV
on
7 Jul 2007
at
08:42
The GRAPES-3 experiment observes extensive air showers using a high-density
array of scintillation detectors and a large area tracking muon detector. We have
studied the relationship between the muon multiplicity distribution and
shower size for the GRAPES-3 data taken during the period of 2000 - 2003.
Monte Carlo simulations using CORSIKA code were performed to extract the
spectra for vario
... More
Presented by Dr. Hideki TANAKA
on
9 Jul 2007
at
13:17
The paper concerns the images in the fluorescence light of EAS of ultra-high energies.
The effect of the multiple scattering of the light in the atmosphere on the way from
the shower to the observer is investigated. We show what are the relevant parameters
of the geometry for describing this effect. We also show that when analysing the
scattered light not delayed too much (with respect to the
... More
Presented by Prof. Maria GILLER
on
4 Jul 2007
at
14:45
The EAS induced by ultra high energy cosmic rays excite the atmosphere which emits
fluorescence light. Images of showers in this light can be registered from large
distances,as narrow tracks, the intensity at a given level being proportional to the
shower energy deposited there. However, there is also Cherenkov light accompanying
the shower which, when scattered sideways, adds to the fluoresc
... More
Presented by Prof. Maria GILLER
on
6 Jul 2007
at
11:22
JEM-EUSO with a large and wide-angle telescope mounted on ISS has been
planed as a space mission to explore extremes of the universe through the
investigation of ultra-high-energy cosmic rays by detecting photons which
accompany air showers developed in the earth's atmosphere. JEM-EUSO will
be launched by Japanese H-II Transfer Vehicle(HTV) and mounted at the
Exposed Facility of Japanes
... More
Presented by Prof. Fumiyoshi KAJINO
on
10 Jul 2007
at
09:30
We present results from the operation of the high mountain array of 4
water Cherenkov detectors located at 4550 m. a.s.l. located at Sierra
Negra mountain (N 18 59.1, W 97 18.76 ) near of Puebla city in Mexico.
The detectors consist of 4 light-tight cylindrical containers of 4 m2
cross section separated 25m. The vertices of the array form a triangle
with one detector in the middle. The detect
... More
Presented by Dr. Humberto SALAZAR
on
4 Jul 2007
at
14:45
A population of dust grains produced by asteroids and comets is continually
orbiting the Sun to within several Rsun. The grains scatter sunlight and make
up the solar F corona, which shows only slow variations with time. Grain
dynamics are due primarily to interactions with solar photons and the solar
wind, but they are also bombarded by the E > 1 MeV energetic particles
propagating an
... More
Presented by Stephen KAHLER
on
6 Jul 2007
at
14:45
Data on the hourly means of cosmic ray density and anisotropy derived by the
GSM method over the 1957-2006 are introduced in to MySQL database. This
format allowed an access to data both in local and in the Internet.
Using the realized combination of script-language Php and My SQL database
the Internet project was created on the access for users data on the CR
anisotropy in different for
... More
Presented by Dr. Viktor YANKE, Mr. Aliaksandr ASIPENKA
on
9 Jul 2007
at
14:45
The Forbush decreases, recorded during 1951-2005 neutron measurements on Climax
Cosmic Ray Station were used, estimating their number per year F(n) and calculating
their total yearly decrease F(t). They were investigated together with certain
parameters of the hurricanes recorded over a large Atlantic Ocean area, situated
between 25 and 60 degrees West, and 8 and 23 degrees North. In that are
... More
Presented by Prof. Stilian KAVLAKOV
on
6 Jul 2007
at
14:45
MINOS is the first large magnetic detector deep underground and is the first to
measure the muon charge ratio with high statistics in the region near 1 TeV.
An approximate formula for the muon charge ratio can be expressed in terms of
epsilon_pi = 115 Gev,
epsilon_K = 850 GeV and E_mu times cosine theta-zenith. The implications for
K production in the atmosphere will be discussed.
Presented by Dr. Maury GOODMAN
on
5 Jul 2007
at
08:42
Inverse Compton scattering by relativistic electrons produces a major component of
the diffuse emission from the Galaxy. The photon fields involved are the cosmic
microwave background and the interstellar radiation field from stars and dust.
Calculations of the inverse Compton distribution have usually assumed a smooth ISRF,
but in fact a large part of the Galactic luminosity comes from the mo
... More
Presented by Mrs. Elena ORLANDO
on
6 Jul 2007
at
14:45
Muon rate variations during Forbush decreases registered by means of muon
detectors DECOR, TEMP and URAGAN operated in the experimental complex
NEVOD (MEPhI, Moscow) have been studied. Analysis of data of these setups
and also of Moscow neutron monitor (IZMIRAN) has been performed using a
special technique that reduces as statistical as systematic uncertainties.
Preliminary muon energy a
... More
Presented by Dr. Dmitry TIMASHKOV
on
5 Jul 2007
at
12:29
EAS events are developing in the last few 10 kilometers of their path. But
geomagnetic field has been extended until a few thousand kilometers
from the ground. This field deflects charged particles. The deflection is
different for different directions and observers. These differences
is due to amount and direction of the geomagnetic field (a dipole at the
centre of the earth) and the directio
... More
Presented by Dr. Mehdi KHAKIAN
on
4 Jul 2007
at
14:45
Actually until the shower maximum the effect of the atmosphere is: 'an
environment for extension of EAS events', but after it the 'absobtion effect of
the atmosphere' will be dominant. Since the shower maximum for ~100 TeV is
~550 gr/cm^2(~5000m a.s.l), and we are always after it (1200m a.s.l) specially
for higher zenith angle events. So actually in the energy and the site we have
to con
... More
Presented by Dr. Mehdi KHAKIAN
on
4 Jul 2007
at
14:45
A possible signature of a neutrino-induced air shower is a near-horizontal event
developing very deeply in the atmosphere at depths exceeding a few thousand g/cm^2.
Making use of high-statistics shower libraries we study the background to such events from:
(1) high-energy muons produced in primary proton events, which may propagate deeply
into the atmosphere before initiating a subcascade;
... More
Presented by Prof. Karl-Heinz KAMPERT
on
10 Jul 2007
at
12:29
Ion acceleration and Alfven waves excitation at the interplanetary
shocks is studied within the quasilinear approach. Numerically calculated
spectra of ions and Alfven waves are compared with experimental data.
It is shown that calculations are well consistent with the existing measurements.
Presented by Prof. Evgeny BEREZHKO
on
9 Jul 2007
at
14:45
In association with an X17.0 flare on 2005 September 7, strong neutral
emissions were detected both in space and on the ground. In space, intense
emissions of gamma-rays were registered by INTEGRAL and by RHESSI during
the decay phase. Gamma-ray lines at 0.511, 2.2, 4.4, and 6.1 MeV were
observed and there was evidence for pion-decay radiation. On the ground,
relativistic neutrons were o
... More
Presented by Dr. Kyoko WATANABE
on
4 Jul 2007
at
09:18
Measurements with advanced instrumentation on the SAMPEX, SOHO and ACE spacecraft show a large
variability of the ionic charge of heavy ions in solar energetic particle (SEP) events with energy,
in particular for Fe. In this paper we present a survey of ionic charge observations in interplanetary shock
related SEP events obtained in the energy range ~0.18-0.43 MeV/nuc with the SEPICA instrum
... More
Presented by Dr. B. KLECKER
on
4 Jul 2007
at
11:30
The H.E.S.S. collaboration found several so far unidentified sources of
TeV-gamma-radiation without any known counterpart in other wavelengths. One of those
is HESS J1303-631 which was serendipitiously found in the same field of view of PSR
B1259-63 / SS 2883. The possibility that HESS J1303-631 is a clump of dark matter is
discussed.
Presented by Joachim RIPKEN
on
6 Jul 2007
at
14:45
We use the GALPROP code and the ACE data to derive the cosmic ray isotopic
composition at the sources. The composition is derived for two propagation models,
diffusive reacceleration and plain diffusion. We show that the compositions derived
assuming different propagation models are different. We also compare the isotopic
composition at the sources with the latest solar composition. This may p
... More
Presented by Dr. Igor MOSKALENKO
on
5 Jul 2007
at
09:06
The detection of cosmic gamma quanta is very important towards to build an
appropriate picture of the Universe. One of the most convenient techniques is the
atmospheric Cherenkov technique i.e. the detection of the Cherenkov light in
extensive air shower. The Cherenkov telescope Kartalska field for ground based gamma
astronomy is presented. The Cherenkov telescope represents set of spherical m
... More
Presented by Dr. alexander MISHEV
on
9 Jul 2007
at
11:30
Muon neutrino disappearance probability as a function of neutrino flight lenght
L over neutrino energy E was studied. A dip in the L/E distribution was bserved
in the data from Super-Kamiokande-I+II, as perdicted from the sinusoidal flavor
transition probability of neutrino oscillation. The observed L/E distribution
onstrained nu_mu <-> nu_tau neutrino oscillation parameters. We also prese
... More
Presented by Dr. Itaru HIGUCHI
on
7 Jul 2007
at
12:17
LOPES30 is a digital radio antenna array working in the frequency range 40 -- 80 MHz
with 30 dipole antennas triggered by the air shower experiment KASCADE-Grande. From
an absolute calibration the measured field strength of the LOPES30 antenna system is
known and the invesitigation of a large data set taken in east-west polarisation is
performed.
The reconstructed pulse height of the radio em
... More
Presented by Mr. Steffen NEHLS
on
6 Jul 2007
at
09:30
Our galaxy is filled with relativistic nuclei and electrons, or galactic cosmic
rays(GCRs). The source of GCR nuclei, especially ultraheavy nuclei(Z>30), is still
unknown, though the measurement of ultraheavy cosmic rays has been identified as an
important goal of cosmic-ray research. Observation program of ultra-heavy nuclei in
GCRs is proposed with the use of solid-state track detector on bo
... More
Presented by Prof. Nobuyuki HASEBE
on
4 Jul 2007
at
14:45
As a calibrated laser pulse propagates through the atmosphere, the Rayleigh scattered
light intensity arriving at the VERITAS telescopes can be calculated precisely when
atmospheric conditions are good. This technique is originally developed for the
absolute calibration of ultra high energy cosmic ray fluorescence telescopes but is
also applicable to imaging atmospheric Cherenkov telescopes.
... More
Presented by Ms. Michelle HUI
on
9 Jul 2007
at
14:45
The relative fluorescence efficiency for MeV electrons in nitrogen and air has
been measured with high precision by the AIRLIGHT experiment. The range
from 300nm to 400nm was spanned using a 300nm to 400nm broad-band (M-
UG6) filter and 5 narrow-band filters. Fluorescence photons were detected by
seven 2” PMTs in coincidence with the signals of a plastic scintillator which
stopped the c
... More
Presented by Dr. Danays GONZALEZ
on
6 Jul 2007
at
14:45
The energy is among the characteristics of Ultra High Energy Cosmic Rays
(E>5 x 1019 eV) which could be estimated experimentally. The following paper
attempts to estimate the energy of an UHECR proton by applying a Monte Carlo
simulation code. A number of extensive air showers, vertical and inclined,
is simulated to derive the Lateral Distribution Functions of the shower muons.
The scenar
... More
Presented by Dr. Olga MALANDRAKI
on
4 Jul 2007
at
14:45
With the present size of the IceTop air shower array it is possible to measure an
energy spectrum in the range of 1 PeV to 100 PeV. To do so, a lateral pulse height
fit was performed on all analysed showers. Therefore it is crucial to have a
realistic parametrisation of the expected lateral distribution and the corresponding
fluctuations of the measured tank signals. Since IceTop tanks do not
... More
Presented by Mr. Stefan KLEPSER
on
9 Jul 2007
at
10:54
The normalization constant of the lateral distribution function (LDF) of an extensive
air shower is a monotonous (almost linear) increasing function of the energy of the
primary, as well as a monotonous decreasing function of the distance from the shower
core. Therefore, the interpolated signal at some fixed distance from the core can be
calibrated to estimate the energy of the shower. There i
... More
Presented by Mr. Germán ROS
on
4 Jul 2007
at
14:45
Interpretation of EAS measurements strongly depends on detailed air shower
simulations. The uncertainty in the prediction of shower observables for different
primary particles and energies is currently dominated by differences between hadronic
interaction models.The new models QGSJET-II and EPOS, which reproduce all major
results of existing accelerator data (including detailed data of RHIC ex
... More
Presented by Dr. Tanguy PIEROG
on
5 Jul 2007
at
11:18
Richardson et al. [1996] statistically investigated CIR-driven modulations of
Galactic Cosmic Ray (GCR) density with the data obtained by satellites. By examining
depressions caused by CIRs with and without the Sector Boundary (SBs), they concluded
that SBs do not organize the GCR density. On the other hand, a 22-year cycle in the
amplitude of depressions was also confirmed. They suggested tha
... More
Presented by Mr. Yoshitaka OKAZAKI
on
4 Jul 2007
at
14:45
The PAMELA (Payload for Antimatter Matter Exploration and Light nuclei Astrophysics)
experiment is a satellite-borne apparatus mounted on the Resurs DK1 russian
satellite, launched from the Baikonur cosmodrome on June 15th 2006. It is designed
to study charged particles in the cosmic radiation with a particular focus on
antiparticles and light nuclei.
The PAMELA apparatus comprises a time-o
... More
Presented by Dr. Giuseppe OSTERIA
on
6 Jul 2007
at
11:30
We have established cumulative flux limits in the COMPTEL energy range (0.75-30 MeV)
for a large sample of active galactic nuclei (AGN) of general interest. Our target
list consists of both known and unidentified gamma-ray sources at high Galactic
latitudes. Limits to the time-averaged MeV-emission measured with COMPTEL are derived
from all-sky maximum-likelihood and flux maps produced using t
... More
Presented by Dr. J. Gregory STACY
on
6 Jul 2007
at
14:45
The Pierre Auger Observatory has the capability of detecting
ultra-high energy neutrinos by searching for very inclined showers
with a significant electromagnetic component. In this work we discuss
the discrimination power of the instrument for ultra-high energy
neutrinos. Based on the data collected since January 2004 an upper
limit to the diffuse flux of neutrinos at EeV energies is presen
... More
Presented by Dr. Oscar BLANCH-BIGAS
on
5 Jul 2007
at
12:13
The detection of TeV gamma-rays from the direction of the Galactic Centre is one of
the most exciting discoveries in recent years. Observations by the H.E.S.S. system of
imaging atmospheric Cherenkov telescopes provide the most precise available data on
this source in the energy range 150 GeV - 30 TeV. The vicinity of the kinetic centre
of our galaxy harbours numerous objects which could poten
... More
Presented by Christopher VAN ELDIK
on
4 Jul 2007
at
08:54
Active Galaxies such as Mrk 421 have been shown to be highly variable
at all time scales. Atmospheric Cherenkov Telescopes (ACTs) have
excellent instantaneous sensitivity and have observed short bright
flares from Mrk 421. However, long duration variability is difficult
to monitor with ACTs due to their intermittent exposure. Milagro,
in contrast, monitors Mrk 421 with daily observations. Whi
... More
Presented by Dr. Andrew SMITH
on
6 Jul 2007
at
14:45
The MAGIC telescope has performed long term monitoring observations of
the bright TeV Blazars Mrk421, Mrk501 and 1ES1959+650. Up to 40
observations, 30 minutes each have been performed for each source
evenly distributed over the observable period of the year. The
sensitivity of MAGIC is sufficient to establish a flux level of 25% of
the Crab flux for each measurement. These observations are w
... More
Presented by Dr. Florian GOEBEL
on
6 Jul 2007
at
14:45
The high-frequency peaked BL Lac PKS 2155-304, the lighthouse of the Southern
hemisphere sky at VHE gamma-ray energies, has been followed by the H.E.S.S. array of
atmospheric Cherenkov telescopes since the first light of the project, first with a
single telescope in 2002, then with two & three telescopes in 2003, and since 2004
with the full-sensitivity four-telescope array. In this mode, a n
... More
Presented by Dr. Michael PUNCH
on
9 Jul 2007
at
10:42
The residual modulation refers to the invariant level of modulation (modulation
potential approximately 450 MV) observed at sunspot minimum since the
commencement of the neutron monitor record in 1951. Satellite measurements
of the heliomagnetic field show that it exhibited a similar invariance (~5.2 nT)
between the sunspot minima of 1965 and 1996. The cosmic ray record since
1428 shows
... More
Presented by Dr. Ken MCCRACKEN
on
9 Jul 2007
at
12:29
High-peaked BL Lacertae objects are the prime source population for studies with
Cherenkov telescopes. It is obvious that monitoring observations of strong blazars
are orthogonal to the mission of the larger Cherenkov telescopes, as H.E.S.S. and
MAGIC with their discovery potential for new sources (luminosity function, redshift
distribution).
We propose to set up a Cherenkov telescope with lo
... More
Presented by Markus MEYER
on
9 Jul 2007
at
14:45
Cosmogenic radionuclides can be considered as surrogates for a neutron monitor because they are produced mainly
by the interaction of cosmic ray neutrons with nitrogen and oxygen in the atmosphere. Measured in natural
archives such as ice cores (10Be) and tree rings (14C) they record the cosmic ray intensity. Compared to manmade
neutron monitors their time resolution is low (years) and their
... More
Presented by Prof. Juerg BEER
on
7 Jul 2007
at
11:42
After a 1-year-long running time, much information has been collected on the
performance of the ARGO-YBJ detector. In particular, increased expertise on the
detector behaviour in the peculiar environmental conditions of the experimental
site (4300 meters a.s.l.) has been reached. Here we show and discuss the
correlation between the detector operating parameters and the environmental
fact
... More
Presented by Dr. Paolo CAMARRI
on
6 Jul 2007
at
14:45
Traditionally, longitudinal shower profiles are reconstructed in
fluorescence light experiments by treating the Cherenkov light
contribution as background. In this talk we will argue that, due to
the universality of the energy spectra of electrons and positrons, both
fluorescence and Cherenkov light can be used simultaneously as signal
to infer the longitudinal shower development.
We pres
... More
Presented by Dr. Michael UNGER
on
7 Jul 2007
at
08:54
The LAGO project aims at the detection of high energy photons from GRBs using the
single particle technique in ground based water Cherenkov detectors. To reach a
reasonable sensitivity, high altitude mountain sites have been selected and detectors
are in operation in Mexico (Sierra Negra, 4650m a.s.l.) and Bolivia (Chacaltaya,
5300m a.s.l.). We report on detector calibration and operation at h
... More
Presented by Xavier BERTOU
on
6 Jul 2007
at
14:45
Super-Kamiokande-I studied low energy neutrino interactions above 4.5 MeV.
Photo-cathode coverage has been restored to 40% in Super-Kamiokande-III in order to
observe Cherenkov events with an energy even below 4.5 MeV. This is motivated by the
transition of solar neutrino oscillations between vacuum and matter-dominated
oscillations near 3 MeV and delayed neutron detection from inverse-beta in
... More
Presented by Dr. Michael SMY
on
7 Jul 2007
at
13:05
During its first observation cycle, between April 2005 and March 2006,
the MAGIC telescope was able to observe nine different GRB events
since their early beginning. Other observations have been performed
during the following months in its second observation cycle.
The observations, with an energy threshold spanning from 80 to 200 GeV,
did not reveal any gamma-ray emission.
The computed up
... More
Presented by Dr. Markus GARCZARCZYK
on
6 Jul 2007
at
14:45
A nonlinear kinetic theory of cosmic-ray acceleration in supernova remnants is employed to investigate the
properties of the remnant SN 1987A. It is shown that a large downstream magnetic field 10 mG is required to fit
the existing observational data. Such a strong field, together with the strong shock modification due to CR back-
reaction, provides the steep and concave radio-emission spectr
... More
Presented by Dr. Leonid KSENOFONTOV
on
6 Jul 2007
at
14:45
We propose a non stationary three dimensional (3-D) model based on the
transport equation to describe the temporal changes of the rigidity spectrum of
the sporadic Forbush effect of galactic cosmic ray intensity observed by neutron
monitors and ground meson telescopes (energy range of 5-50 GeV). We show
that the main reason of the temporal changes of the rigidity spectrum of the
galactic
... More
Presented by Prof. Michael ALANIA
on
6 Jul 2007
at
08:54
Detailed Monte Carlo simulations of possible configurations for a future
large-scale installation of Imaging Atmospheric Cherenkov Telescopes,
the CTA (Cherenkov Telescope Array), have been carried out. This includes
a full treatment of shower fluctuations, night sky background, registration
of the signal and reconstruction of the registered showers. Although not
representing a detailed desig
... More
Presented by Dr. Thomas SCHWEIZER
on
9 Jul 2007
at
14:45
The Main Injector Neutrino Oscillation Search (MINOS) experiment has continued to
collect atmospheric neutrino events while doing a precision measurement of NuMI beam
nu_mu disappearance oscillations. The 5.4 kton iron calorimeter is magnetized to
provide the unique capability of discriminating between nu_mu and nu_mu_bar
interactions on an event-by-event basis and has been collecting atmosp
... More
Presented by Prof. Alec HABIG
on
9 Jul 2007
at
14:45
Magnetic clouds, as subsets of Interplanetary Coronal Mass Ejections, are
modulating the interplanetary space. We present six observed magnetic clouds
and simulate them according to the circular and the new elliptic cylindrical
models. Both models correspond to magnetic clouds attached to the sun and
the
simulations estimate the characteristics of the clouds, such
probable shapes, orientat
... More
Presented by Dr. Olga MALANDRAKI
on
4 Jul 2007
at
14:45
We report on a project to constrain the large-scale and turbulent magnetic fields of
the Milky Way galaxy, which eventually will incorporate all of the relevant
observational data. The initial work is based primarily on the WMAP3 polarization
and intensity maps, plus a large number of galactic and extragalact point source
Faraday Rotation Measures. Preliminary results on the Galactic magneti
... More
Presented by Mr. Ronnie JANSSON
on
5 Jul 2007
at
11:18
A strong magnetic storm occurred in January 21st, 2005. During this magnetic storm,
fluxes of electrons trapped in the radiation belt were observed simultaneously with
two low altitude satellites, CORONAS-F and SERVIS-1 and some geostationary
satellites, LANLs. During under developing of the magnetic storm, both of the
velocity and the dynamic pressure of solar wind increased by two discrete s
... More
Presented by Dr. Makoto HAREYAMA
on
4 Jul 2007
at
14:45
The magnetic trapping acceleration is a new type of particle trapping and
acceleration in which, in principle, test particles are accelerated indefinitely. A
model of magnetized plasma clouds is used to simulate a shock-type wave.
The attainable energies of test particles trapped by the moving magnetic
neutral sheets are investigated by analytical and numerical methods. To
account for
... More
Presented by Prof. Satoshi TAKEUCHI
on
5 Jul 2007
at
12:53
We present preliminary results of Particle-In-Cell simulations of magnetic turbulence
production by isotropic cosmic ray nucleons streaming upstream of supernova remnant
shocks. The studies aim at testing the MHD predictions by Bell (2004, 2005) of a
strong amplification of short-wavelength nonresonant wave modes and at studying the
the subsequent evolution of the magnetic turbulence and its b
... More
Presented by Dr. Jacek NIEMIEC
on
5 Jul 2007
at
13:05
We discuss the improving of the semi-empirical model of cosmic ray (CR) modulation
proposed by us previously. In order to describe the long-term variations with more
complete reflection in the CR modulation of the complex interaction of global and
local solar magnetic fields it has been proposed to introduce into the model the next
characteristics: the solar magnetic field polarity, the integr
... More
Presented by Dr. Raisa GUSHCHINA
on
9 Jul 2007
at
14:45
The history of life in our planet has not always been a process of gradual evolution. In fact, the study of fossils throughout the different geological eras has revealed that occasionally numerous species disappear abruptly.
In five of the extinctions that have been identified in the last 550 million years more than half of the species disappeared in a short time. The last of these mass extinct
... More
Presented by Prof. Arcadio POVEDA
on
10 Jul 2007
at
19:30
We perform a study of the ultra high energy neutrino detection performances of
a km^3 Neutrino Telescope sitting at the three proposed sites for ANTARES,
NEMO and NESTOR in the Mediterranean sea. We focus on the effect of the
underwater surface profile on the total amount of yearly expected tau and mu
crossing the fiducial volume in the limit of full detection efficiency and energy
resol
... More
Presented by Dr. Ofelia PISANTI
on
5 Jul 2007
at
10:30
A magnetic detector such as MINOS which is measuring the sign of muons has
to deal with issues of bending, which depend on the magnetic field
configuration, and multiple scattering, which depends on the amount of material
which is traversed. Above some momentum which depends on these factors,
the momentum cannot be resolved. Issues related to measurement of the
muon charge ratio in the
... More
Presented by Dr. Maury GOODMAN
on
9 Jul 2007
at
14:45
In the analysis of Imaging Air Cerenkov Telescope (IACT) data, offset and/or
extended source observations require more sophisticated schemes for
determining the presence and statistical significance of any excess gamma ray
signal than the standard Li and Ma On-Off technique that has been
conventionally used in the analysis of point sources. Although arrays of multiple
telescopes have muc
... More
Presented by Dr. Glenn SEMBROSKI
on
9 Jul 2007
at
14:45
We introduce a new Maximum Likelihood method for analyzing cross correlations between
a catalog of candidate astrophysical sources and Ultrahigh Energy Cosmic Rays
(UHECRs), which allows for variable source luminosities and provides a ranking of
individual sources according to their likelihood of having emitted the correlated
UHECRs. We use simulated data to test the validity of this and the
... More
Presented by Mr. Ronnie JANSSON
on
4 Jul 2007
at
14:45
Due to energy losses in the interstellar medium, cosmic ray electrons at TeV energies carry
information on local (within a few hundred parsecs) accelerators. However, measurements
of the spectrum of the cosmic ray electrons beyond 1 TeV are extremely difficult due to the
rapidly declining flux and the much more numerous background of nucleonic cosmic rays. The
very large collection
... More
Presented by Mrs. Kathrin EGBERTS
on
4 Jul 2007
at
11:18
Nowadays, the information on the flux of cosmic ray neutrons has become very
important for the computer technology. Since the reduction of LSI (large scale
integrated circuit) scaling proceeds, the effect of cosmic ray neutrons becomes
significant. Neutrons hit the LSI of the computer and make pseudo signals and false
data. This phenomenon is known as the soft error of the computer. The soft e
... More
Presented by Dr. Ryozo TAKASU
on
6 Jul 2007
at
14:45
Properties of high-energy hadronic interactions can be studied by
measurements of the attenuation lengths of hadrons in air showers.
The hadronic, electromagnetic, and muonic components of air showers
are registered with the KASCADE-Grande experiment. Different methods
are applied to derive attenuation lengths of hadrons from the
measurements. a) The flux of unaccompanied hadrons at ground l
... More
Presented by Dr. Joerg HOERANDEL
on
9 Jul 2007
at
12:17
We found 140 neutrino-induced muons in 854.24 live days in the MINOS far detector,
which has an acceptance for neutrino-induced muons of 6.9e6 cm**2 sr. We looked for
evidence of neutrino disappearance in this data set by computing the ratio of the
number of low momentum muons to the sum of the number of high momentum and unknown
momentum muons for both data and Monte Carlo expectation in the
... More
Presented by Prof. Stuart MUFSON
on
7 Jul 2007
at
13:17
The 980 ton MINOS Near Detector is located at the end of the NuMI beam facility at
Fermilab in a 100 m deep underground cavern. It was designed to study neutrino
oscillations with the Fermilab NuMI beam in conjunction with the MINOS Far Detector.
The magnetized Near Detector has been recording charge-separated atmospheric
cosmic-ray muons since January 2005. A preliminary measurement of the Mu
... More
Presented by Dr. Jeffrey DE JONG
on
5 Jul 2007
at
08:54
Observations of Ultra-Heavy galactic cosmic rays (GCR) help to distinguish the
possible origins of GCRs. The Trans-Iron Galactic Element Recorder (TIGER) is
designed to measure the charge (Z) and energy of GCRs using a combination of
scintillation counters, Cherenkov counters, and a scintillating fiber hodoscope. The
two Cherenkov radiators, one acrylic and one aerogel, provide TIGER with an
... More
Presented by B. F. RAUCH
on
4 Jul 2007
at
11:06
At the southern site of the Pierre Auger Observatory, which is close to completion,
an exposure that significantly exceeds the largest forerunner experiments has already
been accumulated. We report a measurement of the cosmic ray energy spectrum based on
the high statistics collected by the surface detector. The methods developed to
determine the spectrum from reconstructed observables are des
... More
Presented by Dr. Markus ROTH
on
4 Jul 2007
at
11:06
We report on the cosmic ray spectrum obtained using the inclined events detected with
the Pierre Auger Observatory. Showers with zenith angles between 60$^\circ$ and
80$^\circ$ recorded in the period between January 1st, 2004 and December 31st, 2006
are analysed. Showers are first reconstructed in arrival direction and then fitted to
density maps of the muon numbers obtained from $10^{19}$eV s
... More
Presented by Mrs. Pedro FACAL
on
4 Jul 2007
at
11:18
The ARGO-YBJ experiment is a full coverage EAS-array installed at
the YangBaJing Cosmic Ray Laboratory (4300 m a.s.l., Tibet, P.R.
China). We present the results on the angular resolution measured
with different methods with the full central carpet ($\sim$5800
m$^2$). The comparison of experimental results with MC simulations
is discussed.
Presented by Dr. Elvira ROSSI
on
4 Jul 2007
at
14:45
Potential sources for the ultrahigh energy cosmic ray flux are
extragalactic source types such as active galactic nuclei and gama ray
busts. With the prediction of hadronic processes in these sources, a
diffuse neutrino flux ca be produced together with the charged cosmic ray
component. To measure this diffuse neutrino flux is one of the main goals
of the Antarctic Muon And Neutrino Detector
... More
Presented by Jan LUENEMANN
on
9 Jul 2007
at
12:05
Three years of data collected with the fluorescence detector in coincidence with at
least one station of the surface detector array ('hybrid data') are used to measure
the flux and energy spectrum of cosmic rays above about 10^{18}eV. The hybrid
measurement extends the spectrum measured with the surface detector data alone
towards lower energies, and provides a cross-check in the overlap regio
... More
Presented by Dr. Lorenzo PERRONE
on
4 Jul 2007
at
11:30
The complete 5.4 kton MINOS far detector has been taking charge-separated cosmic ray
muon data since the beginning of August, 2003 at a depth of 2070 meters
water-equivalent in the Soudan mine, Minnesota. The data with both normal and
reversed magnetic field running configurations were combined to minimize residual
systematic errors in the charge ratio. Using the map of the Soudan rock overb
... More
Presented by Prof. Stuart MUFSON
on
5 Jul 2007
at
09:18
The balloon-borne cosmic-ray experiment CREAM-I (Cosmic-Ray Energetics And Mass)
completed a successful 42-day flight during the 2004-2005 NASA/NSF/NSBF Antarctic
expedition. CREAM-I combines an imaging calorimeter with charge detectors and a
precision transition radiation detector (TRD). The TRD component of CREAM-I is
targeted at measuring the energy of cosmic-ray particles with charges grea
... More
Presented by Prof. Scott WAKELY
on
6 Jul 2007
at
08:30
High-statistics data collected with Russian-Italian coordinate detector DECOR are
analyzed. Precise measurements of muon angular distributions in zenith angle interval
from 20 to 90 degrees have been performed. In total, more than 160 million muons are
selected. Dependences of the absolute integral muon intensity on zenith angle for
several threshold energies ranging from 1.7 GeV up to 7 GeV a
... More
Presented by Dr. Igor YASHIN
on
9 Jul 2007
at
14:45
The air fluorescence detectors (FDs) of the Pierre Auger Observatory are
vital for the determination of the energy scale. To compensate for
variations in atmospheric conditions that affect shower energy
determination, Auger has instituted an extensive atmospheric monitoring
program. The program includes a Central Laser Facility (CLF) and an Extreme
Laser Facility (XLF) to provide the FDs with
... More
Presented by Mr. Seveg BEN ZVI
on
4 Jul 2007
at
14:45
Important information pertaining to the origin of high-energy cosmic rays can be gained by studying their mass
composition in the region of the knee (~3 PeV). Thus, air showers have been observed at the South Pole using the
SPASE-2 surface array, which measures the electron-component, and the AMANDA-2 neutrino telescope, which
measures the coincident muon-component. These two components, t
... More
Presented by Dr. Chihwa SONG
on
4 Jul 2007
at
12:41
We present here the capabilities of the GLAST Large Area Telescope to detect cosmic
ray high-energy (HE) electrons in the energy range from 10 GeV to 1 TeV. We also
discuss the science topics that can be investigated with HE electron data and
quantify the results with LAT instrument simulations. The science topics include CR
propagation, calibration of the IC gamma-ray model, testing hypothese
... More
Presented by Dr. Alexander MOISEEV
on
6 Jul 2007
at
12:29
Diffuse gamma radiation produced in the interaction of cosmic-ray
particles with matter and radiation in the Galaxy can be used for
probing the origin of cosmic rays. The large field of view and
long observation time of the Milagro Gamma-Ray Observatory-- a water
Cherenkov detector that operates continuously, detecting extensive air
showers from the overhead sky -- is an ideal instrument f
... More
Presented by Dr. Petra HUENTEMEYER
on
4 Jul 2007
at
09:18
Ionization loss of electrons in atmosphere, as a corresponding fraction of
extensive air shower (EAS) energy dissipated along cascading, amounts to a
major part of the primary particle energy. It has been shown that there is a
relation between the loss and the total flux of air Cherenkov light induced by
relativistic electrons where the model dependence is parameterized by the
shower max
... More
Presented by Dr. Anatoly IVANOV
on
4 Jul 2007
at
14:45
The two-point autocorrelation function of ultra-high energy cosmic ray
(UHECR) arrival directions has a broad maximum around 25 degrees,
combining the data with energies above $4\times 10^{19}$ eV (in the
HiRes energy scale) of the HiRes stereo, AGASA, Yakutsk and SUGAR
experiments. This signal is not or only marginally present analyzing
events of a single experiment, but becomes significant
... More
Presented by Prof. Michael KACHELRIESS
on
7 Jul 2007
at
08:30
The method of the analysis of data on vertical rigidities of cosmic rays cutoff is
described. The essence of the method consists in the fact, that both the
experimental data and the calculation results are described in the form of
change of their value relative to the values related to IGRF. The value of these
relative changes quite certainly depends on the rigidity itself and on the level
... More
Presented by Dr. Boris Yu. YUSHKOV
on
6 Jul 2007
at
14:45
The new statistical method for search of weak signals of the various natures is
offered. This method is applied, when average value of a signal does not give
statistically significant excess over an average background of the device. The method
uses property of statistical distributions to increase number of the large
fluctuations in the mentioned above case. In result a noticeable change of
d
... More
Presented by Prof. Leonty MIROSHNICHENKO
on
6 Jul 2007
at
11:06
The balloon-borne ANITA high energy neutrino telescope successfully launched
on December 15, 2006 and flew for a little less than 35 days. Its primary
mission is to detect astrophysical neutrinos with energies in excess
of 10^19 eV. Neutrino interactions in Antarctic ice produce short, intense
radio pulses that are detected by ANITA at distances as large as 600 km.
The usual detection scena
... More
Presented by Prof. Steven BARWICK
on
9 Jul 2007
at
14:45
Milagro is a ground-based TeV gamma-ray telescope in the Jemez mountains
near Los Alamos NM. Designed to image TeV gamma-ray sources, it is also
sensitive to energetic solar particles above the local geomagnetic cutoff.
It sits relatively close to the Climax neutron monitor in Colorado. Because
of their geomagnetic proximity, these two instruments can be jointly used to
construct a time-dep
... More
Presented by Mr. Trevor MORGAN
on
6 Jul 2007
at
13:05
Each of the VERITAS telescopes has 345 adjustable glass facets
which were manufactured by D.O.T.I., Roundrock, Texas with
slumping and grinding to get the optical figure. The facets
were aluminized and anodized at the Whipple Observatory. The
parameters (reflectivity, focal length and blur circle) were
measured. The design specifications for focal length (12.00 m
+/- 1%) and spot size (< 10
... More
Presented by J. PERKINS
on
9 Jul 2007
at
14:45
The MAGIC Collaboration operates the 17m imaging Cherenkov telescope on the Canary
island La Palma. The main goal of the experiment is an energy threshold below 100 GeV
for primary gamma rays. The new analysis technique (model analysis) takes advantage
of the high resolution (both in space and time) camera by fitting the averaged
expected templates of the shower development to the measured sho
... More
Presented by Mr. Daniel MAZIN
on
9 Jul 2007
at
14:45
The heliospheric interface is calculated using a three-fluid hydrodynamic model.
Using this approach the effects of different solar wind profiles, as they may
occur during different levels of solar activity, on the heliospheric structure and
the distribution of hydrogen and pickup ions are calculated self-consistently.
We present a time dependent parameter study with respect to the solar w
... More
Presented by Dr. Stefan FERREIRA
on
9 Jul 2007
at
14:45
Elaboration of a multipurpose astrophysical orbital observatory (MAOO) INCA is
continued. The MAOO is designed on basis of ionization-neutron calorimetry for the
direct study of spectra and composition of high-energy primary cosmic radiation in
the range ~1011 –1016 eV. Scientific goals of the project are discussed, namely,
measurements of (a) the PCR charge composition and energy spectra of
... More
Presented by Prof. Rauf MUKHAMEDSHIN
on
4 Jul 2007
at
14:45
The diurnal variations of GCR intensity observed by the ground NM stations
represent the anisotropic GCR flow at 1 AU. It is generally believed that the
variation of the local time of the GCR maximum intensity (phase) has 22-year
period of two sunspot cycles. However, there even exists doubt on such
anisotropy variation cycle. Those different interpretations come from the lack of
enough
... More
Presented by Prof. Yu YI
on
9 Jul 2007
at
11:18
The Ulysses spacecraft was close to the ecliptic at ~5 AU during the periods of
enhanced solar activity in January and September 2005. The KET/Ulysses
instrument registers a flux of cosmic ray protons within 5-2000 MeV, fluxes
have been disturbed more than three solar rotations during the considered
period. We find two periods of 27 days, when disturbances from the active
region have bee
... More
Presented by Dr. Alexei STRUMINSKY
on
4 Jul 2007
at
14:45
The energy spectra of protons in the 1-100 MeV range are studied under quiet
solar activity periods during the 21st - 23rd cycles using data sets from near-
Earth spacecraft. A series of low-flux spectra is approximated by the form J(E)
=AE(^-g)+CE^n, the two terms describing solar/heliospheric and galactic
components, respectively. By determining the best fitting parameters to the
energy
... More
Presented by Dr. Karoly KECSKEMETY
on
10 Jul 2007
at
10:30
The Milagro gamma-ray observatory is a water-Cherenkov detector capable
of observing air showers produced by very high energy gamma-rays. The sensitivity and
performance of the detector is determined by a detailed Monte Carlo
simulation and verified through the observation of gamma-ray sources
and the isotropic cosmic-ray background. Corsika is used for simulating
the extensive air showers pr
... More
Presented by Mr. Vlasios VASILEIOU
on
9 Jul 2007
at
14:45
MAGIC-II, a two 17m telescope system, will start operating at La Palma in the fall of
2007. Its main goal is to improve the sensitivity in the stereoscopic/coincident
operational mode. At the same time it will lower the analysis threshold of the
currently running single MAGIC telescope. Results from the Monte Carlo simulations of
this system will be discussed. A comparison of the two telescope
... More
Presented by Mr. Nepomuk OTTE
on
9 Jul 2007
at
14:45
The Very High Energy Telescope Array (VERITAS) is a system of four imaging Cherenkov
telescopes located at the Fred Lawrence Whipple Observatory in southern Arizona. We
present here results of detailed Monte Carlo simulations of the array response to
extensive air showers. Cherenkov image and shower parameter distributions are
calculated and show good agreement with distributions obtained from
... More
Presented by Dr. Gernot MAIER
on
9 Jul 2007
at
14:45
This talk present preliminary results for the time-dependent cosmic-ray
propagation in the Galaxy by a fully 3-dimensional Monte Carlo simulation.
The distribution of cosmic-rays (both protons and helium nuclei) in
the Galaxy is studied on various spatial scales for both constant and variable
cosmic-ray sources.
The continuous diffuse gamma-ray emission produced by cosmic-rays during the
... More
Presented by Prof. Martin POHL
on
6 Jul 2007
at
09:18
A bimodal distribution around the sunspot cycle maximum was suggested to
exit for solar-terrestrial parameters (Storini et al., Adv. Space Res. 31, n° 4, 895-
900, 2003). The period between the two activity peaks was called the
Gnevyshev Gap by the Rome Cosmic Ray Group (Storini and Pase, GBRSC News
5, Special Issue, 255-258, 1995) and it is world-wide accepted by the scientific
communit
... More
Presented by Dr. MARISA STORINI
on
9 Jul 2007
at
11:30
The H.E.S.S. source J1809-193 was discovered in 2006 in data of the Galactic Plane
survey, followed by several re-observations. It shows a hard gamma-ray spectrum and
the emission is clearly extended. Its vicinity to PSR J1809-1917, a high spin-down
luminosity pulsar powerful enough to drive the observed gamma-ray emission, makes it
a plausible candidate for a Pulsar Wind Nebula. On the other
... More
Presented by Nukri KOMIN
on
6 Jul 2007
at
08:54
AMANDA is a high volume neutrino telescope designed to search in the down-going direction for muons from
astrophysical muon-neutrinos. It is possible to extend the range of AMANDA to search for neutrinos with
extremely high energies. The atmospheric neutrino flux becomes negligible above 10^15 eV, so this value serves
as rough energy threshold for this search. Above 10^16 eV the Earth is ess
... More
Presented by Lisa GERHARDT
on
5 Jul 2007
at
11:30
The high-frequency peaked BL Lac PG 1553+113
was discovered by H.E.S.S. to be a emitter of VHE (>100 GeV)
gamma rays during ~8 hours of observations in 2005.
The AGN was observed again by H.E.S.S in 2006.
A total of ~17 hours of additional data were taken.
In addition, observations using the VLT Sinfoni
instrument were made to determine the presently unknown
redshift of PG 1553+113. Res
... More
Presented by Dr. Wystan BENBOW
on
6 Jul 2007
at
14:45
The EEE (Extreme Energy Event) Project is an extensive air shower experiment devoted
to the study of very high energy events through the detection at ground of the muon
component of the shower. The detectors are installed inside many Italian High
Schools, involving students in the experiment. The detector used is a tracking
telescope made of 3 planes of Multi-gap Resistive Plate Chambers (MRPC
... More
Presented by Giovanni IMPONENTE
on
7 Jul 2007
at
10:54
Since their discovery as VHE emitters by H.E.S.S. in 2004,
the high-energy peaked BL Lacs PKS 2005-489 and H 2356-309 have been monitored
at VHE to study their flux and spectral variability.
To sample their SED, several multiwavelength campaigns with X-ray satellites have been
performed, showing important spectral changes. Here we present the results
of 3 years of H.E.S.S. observations to
... More
Presented by Dr. Luigi COSTAMANTE
on
6 Jul 2007
at
14:45
High redshift massive protogalaxies, the sites of early star formation
in the Universe, provided a suitable environment for the formation of
the first supermassive black holes. Mass accretion causes the black
hole to grow and become a gamma-ray blazar for those observers
privileged by a line of sight parralel to the jet. Possible
evolutionary sequences are explored in terms of their visibili
... More
Presented by Dr. Alberto CARRAMINANA
on
6 Jul 2007
at
14:45
A large area streamer tube detector (128m^2), located within the KASCADE-
Grande Experiment, has been built with the aim to identify muons
(E>0.8GeV) and their direction in extensive air showers. Besides the
investigation of the muon pseudorapitity in EAS, the application of the
tracking detector in reconstructing the muon production height is
evaluated. The combination of the muon production
... More
Presented by Dr. Paul DOLL
on
6 Jul 2007
at
12:17
Muon diagnostics is a new technique of remote monitoring and forecasting of
the development of various dynamic processes in the heliosphere and in the
atmosphere and magnetosphere of the Earth based on the analysis of spatial-
angular and temporal variations of muon flux simultaneously detected from all
directions of upper hemisphere. For practical realization of the technique multi-
direc
... More
Presented by Dr. Dmitry TIMASHKOV
on
7 Jul 2007
at
08:54
Data collected during the year 2006 by the first 9 strings of IceCube
have been used to measure the energy spectrum of the atmospheric
neutrino flux. Atmospheric neutrinos, an important scientific output
by itself (for instance, to understand the high-energy hadronic
interaction models), are also fundamental in order to check the
performance of the detector and to estimate the background for
... More
Presented by Dr. Juan-de-Dios ZORNOZA
on
9 Jul 2007
at
14:45
Measurements of muon flux in the atmosphere have been performed
by Lebedev Physical Institute during sea expeditions in November, 1975 -
March, 1976 period. This survey covered a wide range of latitudes with
geomagnetic cutoff rigidities Rc from 0.8 up to 14.2 GV.
The data on muon flux as a function of atmospheric depth ( X~ 10-1000 g/cm2)
were
obtained.
On the other hand based on
... More
Presented by Dr. Vladimir MAKHMUTOV
on
7 Jul 2007
at
09:06
Inclined showers (i.e. showers with zenith angle above 40 degrees)
are registered by the KASCADE-Grande experiment, which is designed
to address fundamental questions about the origin, composition and
acceleration mechanisms of primary cosmic rays between $10^{14}$
and $10^{18}$ eV. Despite the aggravate reconstruction due to the
thin scintillation detectors used in KASCADE-G
... More
Presented by Dr. Juan Carlos ARTEAGA-VELAZQUEZ
on
6 Jul 2007
at
12:42
A review of measurements of the muon energy spectra for different altitudes, height
and directions performed with devices placed at various geomagnetic latitudes is
presented. The theoretically motivated final fit to the existing experimental
differential and integral data will be presented. The muon spectra and the muon
charge ratio, defined as the ratio of positive to negative muon fluxes, a
... More
Presented by Prof. Janusz KEMPA
on
9 Jul 2007
at
14:45
We combined solar wind observations from five different spacecraft: Helios 1, Helios
2, IMP-8, Voyager 1 and Voyager 2, from November 1977 to February 1978, to study the
structure of the solar wind streams and the propagation of interplanetary shocks,
interaction regions and ejecta. Comparing the in-situ observations is possible to
illuminate some aspects of these events such as their longitud
... More
Presented by Dr. Gonzalez-Esparza AMERICO
on
5 Jul 2007
at
11:30
The NASA Balloon program offers a unique, reliable and low cost platform for
conducting cutting edge cosmic ray research and scientific investigations.
Recently, the balloon program completed new payload support facilities in
Antarctica. In addition, during the 2007 Campaign, for the first time, NASA
demonstrated the ability to launch three science payloads in the same season.
These Anta
... More
Presented by Dr. Magdi SAID
on
4 Jul 2007
at
14:45
We calculate the temporal changes of the exponent g of the power law rigidity
R spectrum of the GCR isotropic intensity variations using neutron monitors
experimental data for four 11-year cycles of solar activity (1960–2002). The
temporal changes of the power law rigidity spectrum exponent g of the GCR
isotropic intensity variations are inversely correlated with the changes of the
GCR
... More
Presented by Prof. Michael ALANIA
on
9 Jul 2007
at
11:06
Nonlinear kinetic theory of cosmic ray acceleration in supernova remnants is used to investigate the properties of
Kepler's SNR and, in particular, to predict the gamma-ray spectrum expected from this SNR. Observations of the
non-thermal radio and X-ray emission spectra as well as theoretical constraints for the total supernova explosion
energy are used to constrain the astronomical and part
... More
Presented by Dr. Leonid KSENOFONTOV
on
6 Jul 2007
at
08:30
The Main Injector Neutrino Oscillation Search (MINOS) long baseline experiment
has been actively taking beam data since 2005, having already
accumulated 2.6E20 protons-on-target. MINOS uses the most
powerful neutrino beam currently in operation measured in two
locations: a Near detector at Fermilab, close to beam production, and
a Far detector, 735 km downstream, in Northern Minnesota.
Alth
... More
Presented by Dr. Alexandre SOUSA
on
9 Jul 2007
at
14:45
The Main Injector Neutrino Oscillation Search (MINOS) long baseline experiment
has been actively taking beam data since 2005, having already
accumulated 2.6E20 protons-on-target. MINOS uses the most
powerful neutrino beam currently in operation measured in two
locations: at Fermilab, close to beam production, and 735 km
downstream, in Northern Minnesota. By observing the oscillatory
structur
... More
Presented by Dr. Alexandre SOUSA
on
7 Jul 2007
at
12:05
Fourth generation neutrino telescopes are now being constructed (IceCube) and
designed (KM3NET). While no neutrino flux of cosmic origin has been discovered so
far, the first weak signals are expected to be discerned in the next few years.
Multi-messenger investigations aim at addressing the problem of extracting these
signals from irreducible backgrounds. One possible application is the searc
... More
Presented by Elisa BERNARDINI
on
10 Jul 2007
at
12:53
A simple model of a homogeneous population of cosmic accelerators injecting protons
following a unique power law has long been shown to fit the HiRes monocular data very
well. The model evolves the sources with redshift and adjusts both the redshift
evolution and the exponent in the injecting power law to fit the data. At lower
energies galactic iron is added in as suggested by composition mea
... More
Presented by Mrs. Olga BRUSOVA
on
4 Jul 2007
at
14:45
Hadronic interactions of cosmic protons and nuclei with the ambient gas lead to the
production of both neutrinos and gamma-rays. Both types of secondary particles can be
used to provide information on sites of cosmic-ray acceleration. As messengers
gamma-rays have a clear advantage in that sensitive detectors can be readily
constructed. However, despite the difficulty of experimental neutrino
... More
Presented by Mr. Christian STEGMANN
on
10 Jul 2007
at
12:17
The space weather refers to conditions on the sun, solar wind and Earth’s
magnetosphere and ionosphere. Several characteristic signatures in cosmic ray may be
used for space weather applications on the basis of secondary cosmic ray neutron
data. Good examples are the solar proton events and Geomagnetic storms. A possible
tool for investigations from Earth the variation of cosmic ray flux is
... More
Presented by Dr. alexander MISHEV
on
6 Jul 2007
at
14:45
One of the physics goals in SK-III is the observation of relic supernova
neutrinos from the identification of their electron anti-neutrino component.
Application of the delayed coincidence method benefits as a powerful tool
in the selection of an electron anti-neutrino with largely reduced background.
This selection is accomplished by detecting both a positron and a neutron
created in the inv
... More
Presented by Dr. Hideki WATANABE
on
9 Jul 2007
at
14:45
The neutron multiplicity changes on the neutron monitor in Barentsburg
(Spitsbergen) during the GLE December 13, 2006 has been studied. The
neutron monitor in Barentsburg was put into operation on April, 2003. In 2006
it has found the complete configuration 18-NM-64. The new data collecting
system based on a digital ADLINK 7233 card allows to register both pulses, and
intervals between t
... More
Presented by Prof. Eduard VASHENYUK
on
6 Jul 2007
at
11:30
The deeper and more extended scan of the Galactic Plane by H.E.S.S. during 2005 and
2006 has revealed a number of new point-like as well as extended sources. We will
present and discuss cases where the VHE emission detected by HESS could be associated
to pulsar wind nebulae around young pulsars in our Galaxy.
Presented by Dr. Arache DJANNATI-ATAÏ
on
6 Jul 2007
at
10:54
The star and galaxy formation history has left an imprint on the diffuse
extragalactic radiation field in the ultraviolet to infrared wavelength regime. In
the spectral energy distribution two distinct bumps
are expected: A first bump in the optical to near-infrared coming from direct
starlight redshifted
over time and a second bump in the infrared from dust-reemission. Direct measurements
o
... More
Presented by Mr. Martin RAUE
on
10 Jul 2007
at
08:54
The H.E.S.S. 2004-2005 survey of the Galactic Plane at energies above 200
GeV had revealed a number of pulsar wind nebulae candidates, including the
remarkable source HESS J1825-137. Spatially resolved spectral measurements
of this source gave the first evidence of an energy-dependent morphology
which was interpreted as being due to the cooling of relic electrons
cumulated throughout pul
... More
Presented by Dr. anne LEMIERE
on
6 Jul 2007
at
08:42
Approximately 20 years ago it was discovered that the largest solar energetic
particle (SEP) events are closely associated with Coronal Mass Ejections (CMEs) in
which the Sun suddenly ejects a billion tons of material at speeds that can exceed
2500 km/sec. The past solar maximum provided the opportunity to study the connection
between CMEs and SEPs using SOHO images and SEP data from near-Eart
... More
Presented by Dr. Richard A. MEWALDT
on
5 Jul 2007
at
17:25
A new approach to investigations of ultra-high energy cosmic rays based on the new
EAS observable - spectra of local density of muons measured at ground level in a wide
range of zenith angles - is considered. It is shown that muon density spectra are
sensitive to the primary cosmic ray spectrum and composition, and to features of the
forward kinematic region of hadronic interaction, and thus p
... More
Presented by Dr. Igor YASHIN
on
6 Jul 2007
at
10:42
FRAM - F/(Ph)otometric Robotic Atmospheric Monitor is the latest addition
to the atmospheric monitoring instruments of the Pierre Auger Observatory.
An optical telescope equipped with CCD camera and photometer, it
automatically observes a set of selected standard stars and a calibrated
terrestrial source. Primarily, the wavelength dependence of the
attenuation is derived and the comparison be
... More
Presented by Dr. Petr TRAVNICEK,
on
4 Jul 2007
at
14:45
In this work we investigate new statistical parameters to infer the mass composition
of high energy cosmic rays above $10^{17}$ eV.
Trying to overcome the difficulties imposed by large fluctuations and limited
experimental observables, we present a statistical method for composition studies
based on several measurable features of the longitudinal and lateral development of
the air shower.
P
... More
Presented by Dr. Vitor DE SOUZA
on
4 Jul 2007
at
14:45
The Cosmic Ray Energetics And Mass (CREAM) experiment is designed to investigate the
source, propagation and acceleration mechanism of high energy cosmic-ray nuclei, by
directly measuring their energy and charge. Incorporating a transition radiation
detector (TRD) provides an energy measurement complementary to the calorimeter, as
well as additional track reconstruction capability. The next
... More
Presented by Dr. Alexander MALININ
on
4 Jul 2007
at
14:45
The origin of anomalous cosmic ray ions has long been assumed to be heliospheric
pickup ion production from interstellar neutrals and acceleration at the solar wind
termination shock. The Voyager-1 shock crossing showed a well-defined boundary for
sharply increased keV ion fluxes in the heliosheath but no sign of local
acceleration. Ion flux spectra at keV to MeV energies are instead unfolding
... More
Presented by Dr. John F. COOPER
on
10 Jul 2007
at
12:05
An improved nonlinear theory for the perpendicular transport of charged particles is
presented. This approach is based on an improved nonlinear treatment of field-line
random walk in combination with a generalized compound diffusion model. The
generalized compound diffusion model employed is much more systematic and reliable,
in comparison to previous theories such as the nonlinear guiding cen
... More
Presented by Dr. Andreas SHALCHI
on
9 Jul 2007
at
08:30
We present the results of an analysis of Chandra and RXTE X-ray spectral
data for the supernova remnant Cas A. Thousands of Chandra spectra for
roughly arcsecond-sized regions were fitted with a simple model that
includes a bremsstrahlung continuum and several Gaussian emission lines.
The results of this analysis reveal that the faint, narrow filaments around
the outer edge of the remnant hav
... More
Presented by Dr. Glenn ALLEN
on
4 Jul 2007
at
12:17
In 80th a new type of APDs with negative local feedback which significantly
reduces the excess noise factor introduced by the avalanche process - the
metal-resistive layer-semiconductor (MRS) APDs - were developed in INR
(Moscow) by Sadygov et al. in the frameworks of the Soviet DUMAND program
led by M.A. Markov.
In 90th and during a few last years some new kinds of the Micro-pixel
Aval
... More
Presented by Dr. Igor ZHELEZNYKH
on
9 Jul 2007
at
14:45
The future high energy nuclear cosmic ray flux measurements in the upper atmosphere
will require large, and thus accurate, corrections for reliable Top of Atmosphere
(galactic) fluxes to be derived. In this perspective, the atmospheric corrections are
evaluated from the transport calculations of the flux in the atmosphere. The
contributions of these corrections to the accuracy of the experimen
... More
Presented by Dr. Laurent DEROME
on
6 Jul 2007
at
14:45
We have measured the primary cosmic ray spectra of various nuclear groups
by analyzing the relationship between muon multiplicity distribution
and air shower size, and we have also estimated their mean mass as a function
of primary energy. The shower data were obtained from the four years of
observations with the GRAPES-3 air shower experiment, which has a
high-density air shower array o
... More
Presented by Dr. Hideki TANAKA
on
9 Jul 2007
at
09:06
We present a Monte-Carlo calculation of the propagation of cosmic ray protons in the
Galaxy for energies above 1 PeV. We discuss the relative strengths of competing
effects such as parallel/perpendicular diffusion and drifts in toy models of the
Galaxy. We compare our estimates with the results of the MC calculation for the toy
models and then we apply the MC calculation to a few realistic mod
... More
Presented by Dr. Daniel DE MARCO
on
5 Jul 2007
at
10:54
A direct comparison of impulsive nitrate enhancements observed in multiple
polar ice cores from both hemispheres is presented for the years 1940-1950.
During that time period, four ground-level solar cosmic ray events (GLEs) were
recorded by ionization chambers. We show that large and sudden
enhancements in the nitrate records from both hemispheres were observed
within weeks of the dat
... More
Presented by Dr. Don SMART
on
7 Jul 2007
at
10:30
Presented by Dr. Pasquale BLASI
on
11 Jul 2007
at
09:30
Presented by Dr. Jim HINTON
on
11 Jul 2007
at
12:30
Presented by Dr. Gavin ROWELL
on
11 Jul 2007
at
16:30
A strong Forbush Decrease (FD) was observed by ground based neutron
monitor at Oulu in the mid of May 2005. The onset of FD took place on May 13
and attained its maximum on May 15, 2005. The event was in response to 221
X-ray flares out of which 13 were of M class and they were followed by coronal
mass ejection (CME). This has caused a rapid decrease in galactic cosmic ray
intensity call
... More
Presented by Mrs. Manjula JAIN
on
5 Jul 2007
at
12:05
Ions accelerated in solar flares interact with the solar atmosphere to produce
gamma-ray lines and neutrons. Some of the neutrons that escape from the Sun
into interplanetary space can survive to the Earth and be observed both by
satellite detectors and by ground-based neutron detectors. In association with
the X12.0 flare on 1991 June 4, solar neutrons were observed in space by
OSSE onb
... More
Presented by Dr. Kyoko WATANABE
on
4 Jul 2007
at
14:45
In August 2005, MAGIC telescope observed the cataclysmic variable AE Aquarii.
Observations were done during four consecutive nights within the context of a
coordinated quasi-simultaneous multiwavelength campaign covering radio, optical, UV,
and X-ray range. We report on the results of this campaign.
Presented by Ms. Nuria SIDRO MARTIN
on
6 Jul 2007
at
14:45
The Large Area Air Shower experiments have been observing
extensive air showers at sea level, in large part of Japan.
The data set obtained for more than 10 years are going to be analyzed
in order to study isotropic and anisotropy nature of cosmic ray
arrival directions. We compare our results with diffusive propagation
model of galactic cosmic rays in one and two dimensional anisotropy
anal
... More
Presented by Dr. Atsushi IYONO
on
7 Jul 2007
at
11:30
The MAGIC Telescope is the only IACT suited for the observation of GRBs.
Thanks to its fast repositioning time and low energy threshold, MAGIC has
been able to perform observations of the prompt and early afterglow
emission of several GRBs. Since the beginning of operations of Swift
the GRB scenario has changed, both for what concerns the statistics of
alerts and for the new discoveries on th
... More
Presented by Dr. Markus GARCZARCZYK
on
9 Jul 2007
at
12:05
HESS J1303-631 is one of the unidentified TeV gamma-ray sources
which H.E.S.S. group discovered as a diffuse source.
We observed HESS J1303-631 between February and May in 2006
with the CANGAROO-III imaging atmospheric Cherenkov telescope system.
After considering the weather conditions, the total exposure is
about 35 hours live-time. Estimated threshold energy based on
the Monte Carlo
... More
Presented by Dr. Junko KUSHIDA
on
6 Jul 2007
at
14:45
The H.E.S.S. collaboration has reported the detection of gamma-ray emission from
eight new sources located in the Galactic Plane. HESS J1804-216 is one of the
brightest of them, and its size and photon index make it one of the largest and
softest sources. The H.E.S.S. collaboration proposed two possible counter parts,
young Vela-like pulsar B1800-21 and the SNR G8.7-0.1, but it does not perfec
... More
Presented by Mr. Yusuke HIGASHI
on
6 Jul 2007
at
14:45
More than forty gamma-ray sources have been detected
by atmospheric Cherenkov telescopes at TeV energies.
However, no cluster of galaxies have been proved to be
a TeV gamma-ray emitter until now, though there
are many theoretical predictions on the possible
gamma-ray fluxes from these gigantic objects
assuming various emission mechanisms.
We have observed a couple of clusters of galaxies in
... More
Presented by Mr. Ryuta KIUCHI
on
9 Jul 2007
at
11:42
The binary system LS 5039 was serendipously with the High Energy
Stereoscopic system (H.E.S.S.)
during the scan of the inner galactic plane in 2004. Deeper observations
were carried out in 2005, and brought clear evidence for TeV emission
perodicity. This is the highest energy periodic source known so far.
The observed flux modulation is attributed to a modulated absorption
of the VHE gamma
... More
Presented by Mr. Mathieu DE NAUROIS
on
6 Jul 2007
at
09:30
The relative sidereal variation in the arrival direction of primary
cosmic ray nuclei of median energy 10 TeV was measured using downward,
through-going muons detected with the Super-Kamiokande-I detector.
The projection of the anisotropy map onto the right ascension axis has
a first harmonic amplitude of
(6.64 +/- 0.98 (stat.) +/- 0.55 (syst.)) x 10^-4 and a phase at maximum at
(33.2^o +/-
... More
Presented by Dr. Yuichi OYAMA
on
10 Jul 2007
at
08:54
The Crab nebula is the best known pulsar wind nebula and one of
the most energetic sources of non-thermal radiation known in our
Galaxy. It has been extensively studied over a broad range of
energies from Radio to TeV gamma-rays. However, an observational
gap in VHE-gamma-rays exists between the data available from
satellite experiments and the currently running ground based
experiments. The
... More
Presented by Mr. A. Nepomuk OTTE
on
6 Jul 2007
at
11:30
The HiRes Experiment has observed the GZK Cutoff. We will present power law fits to
the latest HiRes monocular spectra, and use the results of these fits to argue that
the GZK Cutoff has been definitively observed in that dataset. We will also present
fits to a uniform sorce density model.
Presented by Prof. Douglas BERGMAN
on
4 Jul 2007
at
08:30
The Supernova remnant Cassiopeia A was observed with the 17 meter imaging atmospheric
Cherenkov telescope MAGIC for about 50 hours in winter 2006/07. The observations were
performed in the so-called wobble mode, under moderated Moon illumination. Above 1
TeV, Cas A has been detected by the HEGRA Stereoscopic Cherenkov Telescope System, at
the level of few percent of Crab. The detection of TeV
... More
Presented by Dr. Emma OÑA-WILHELMI
on
4 Jul 2007
at
12:05
The 5.4 kT MINOS Far Detector (Fardet) has accumulated 45 million
cosmic-ray induced
muon tracks at a depth of 2100 mwe since it began operation in 2003.
An analysis of the muon intensity over the time of detector running
has revealed periodic fluctuations, which are correlated with
temperature fluctuations in the upper atmosphere. This agrees with the
theoretical
expectation for muon
... More
Presented by Eric GRASHORN
on
5 Jul 2007
at
08:30
Shell-type supernova remnants (SNRs) accelerate particles at the shock front
between the expanding remnant and the swept-up interstellar medium. If these
particles include protons and nuclei, very-high-energy gamma-ray emission may
result from the decay of pions produced in interactions between cosmic rays and
the local insterstellar medium. For SNRs that are interacting with a nearby
mol
... More
Presented by Dr. Brian HUMENSKY
on
7 Jul 2007
at
12:53
The ultra-luminous infra red galaxies (ULIRGs) have an enhanced starburst
rate which might be related to a large emission of very high
energy gamma rays.
Arp 220 is the nearest ULIRG (72 Mpc) and a well studied object.
This source was observed with the stand alone imaging atmospheric
Cherenkov telescope MAGIC for more than 15 hours on-source.
No significant gamma ray excess was detected dur
... More
Presented by Dr. vincenzo VITALE
on
6 Jul 2007
at
14:45
The high mass x-ray binary LSI +61 303 was observed for several months in 2006 and
2007 by VERITAS, an array of several imaging Cherenkov telescopes located at the Fred
Lawrence Whipple Observatory in southern Arizona. The unusual system of a black hole
or neutron star orbiting a Be star proves to be an efficient particle accelerator.
Here we present the detection of LSI +61 303 in very high
... More
Presented by Dr. Gernot MAIER
on
6 Jul 2007
at
14:45
The increase of the gamma-ray dose-rate in association with the activity of the
thunderstorm was observed by the detectors located at the ground level in the
winter of Japan. To investigate the particle acceleration mechanism during
winter thunderstorms, the four sets of radiation detectors were used which
consist of four long proportional counters (PRCs). These PRCs have a different
res
... More
Presented by Dr. Tatsuo TORII
on
6 Jul 2007
at
14:45
Baksan Neutrino Observatory results on variations of thermal
neutron flux near
the ground surface measured with an open scintillator
detector are presented.
Experimental evidences were obtained of correlation between
the long-term thermal
neutron flux variations and the lunar periods (Radon-neutron
tidal waves).
Presented by Dr. Victor ALEKSEENKO
on
7 Jul 2007
at
11:30
The Telescope Array (TA) experiment is an array of surface detectors
surrounded by three stations of fluorescence telescopes in Utah, USA, to
investigate the origin of the highest energy cosmic rays of energy beyond 10^
{20}eV. We deployed about 500 plastic scintillation counters on a grid with 1.2
km spacing as a surface array by March 2007. Each surface detector is outfitted
with double
... More
Presented by Dr. Hiroyuki SAGAWA
on
7 Jul 2007
at
12:17
Observations of the blazars 1ES 0647+250 and 1ES 0806+524 with VERITAS
are reported here. These objects are among the favoured candidate
extragalactic sources in the very high-energy regime due to the
presence of high-energy electrons and adequate seed photons. The
presence of high-energy electrons is established from the location of
the synrchrotron peak in the spectral energy distribution o
... More
Presented by Dr. Peter COGAN
on
6 Jul 2007
at
14:45
VHE observations of the distant (z=0.186) blazar 1ES 1101-232 with H.E.S.S. are used
to constrain the extragalactic background light (EBL) in the optical to near infrared
band. As the EBL traces the galaxy formation history of the universe, galaxy
evolution models can therefore be tested with the data. In order to measure the EBL
absorption effect on a blazar spectrum, we assume that usual con
... More
Presented by Dr. Gerd PUEHLHOFER
on
9 Jul 2007
at
11:18
The high luminosity blazar 3c279 has been discovered by the EGRET instrument on board
the CGRO. Later, intensive simultaneous monitoring of this object was done in low
energy gamma rays, X-rays and optical to probe crucial questions regarding the
emission mechanism and structure of jets. However, no ground based VHE gamma ray
experiment has been able to detect a signal from it due to its high
... More
Presented by Prof. Masahiro TESHIMA
on
9 Jul 2007
at
09:42
In the present declining phase of the solar cycle, corotating interaction regions
(CIRs) have once again become more prevalent. Since the launch of the two STEREO
spacecraft in October 2006, at least 5 significant particle enhancements due to CIRs
have been observed at 1 AU. The Low Energy Telescope (LET) on each STEREO spacecraft
has been operating since mid-November 2006. This instrument
... More
Presented by Dr. Richard LESKE
on
4 Jul 2007
at
14:45
The 5.4 kT MINOS Far Detector (Fardet) has accumulated 45 million
cosmic-ray induced
muon tracks since it began operation in 2003. An analysis of the muon
flux in the direction of the Moon and Sun, which both obscure a
circular disc of similar radius as viewed from Earth, have
revealed statistically significant deficits. The shadow of the moon has
been used to establish the alignment and
... More
Presented by Eric GRASHORN
on
9 Jul 2007
at
14:45
Many authors have predicted very high energy (VHE; E > 100 GeV) emission from
gamma-ray bursts (GRBs) both during the prompt phase and during the multi-component
afterglow. To date however, there has been no definitive detection of such emission.
Recently, Swift made the exciting discovery that almost half of GRBs are accompanied
by one or more X-ray flares which are found to occur from severa
... More
Presented by Dr. Deirdre HORAN
on
6 Jul 2007
at
12:53
The TeV emitting high-mass X-ray binary system LSI+61303 was observed with the
Swift satellite from early September 2006 to early January 2007. Many of these
observations were contemporaneous with TeV observations. The data consist of
observations on 24 separate days with durations ranging between 700s and
4700s, and cover 4.5 orbital periods of the binary system. We present here a
temporal a
... More
Presented by Dr. Jamie HOLDER
on
6 Jul 2007
at
14:45
M87 is the only non-blazar AGN to be discovered emitting VHE gamma rays, and so it
represents a unique opportunity to study the phenomena of gamma ray emission from
AGN. The rapid variability and unexpectedly hard TeV energy spectrum of M87 has
recently been reported by the HESS collaboration. With VERITAS beginning initial
science observations in early 2007, M87 is a prime target for observat
... More
Presented by Mr. Pierre COLIN
on
10 Jul 2007
at
08:30
VERITAS, the Very Energetic Radiation Telescope Array System, is an
array of four imaging Atmosphereic Cherenkov telescopes in southern
Arizona. It is sensitive to gamma-rays at energies above 100GeV. Here,
we discuss the results of observations of two well known VHE blazars,
Markarian 421 and Markarian 501, during Spring 2006 which were made
with the first two telescopes during the comission
... More
Presented by Stephen FEGAN
on
6 Jul 2007
at
14:45
Many of the recently discovered galactic very high-energy gamma-ray sources are
associated with Pulsar Wind Nebulae (PWN), which is the most populous source category
at TeV energies. Extended synchrotron nebulae seen from these objects in the X-ray
band is a footprint of the relativistic winds, generated by the young energetic
pulsars, which interact with the matter ejected by the supernova ex
... More
Presented by Dr. Alexander KONOPELKO
on
6 Jul 2007
at
09:18
Up to now, nearly all the detected extragalactic VHE gamma-ray sources belong to the
class of high-frequency peaked BL Lac objects (HBL), which show a pronounced peak in
the hard X-ray band. All detected VHE sources show a comparable luminosity at TeV
energies.
MAGIC has started a systematic scan on X-ray bright HBL objects in the northern sky
during its cycle1 observations from January 2005
... More
Presented by Mr. Markus MEYER
on
9 Jul 2007
at
08:42
The gamma-ray pulsar PSR B1509-58, surrounded by the supernova remnant
MSH15-
52, was expected to be a Very High Energy gamma-ray source. CANGAROO-I 3.8
m telescope reported a marginal detection of VHE gamma-rays above 1.9 TeV
and
recently H.E.S.S. detected an extended signal along with the pulsar jets, from
sub-TeV to tens of TeV.
We observed MSH15-52 using CANGAROO-III imaging atmosp
... More
Presented by Mr. Takeshi NAKAMORI
on
4 Jul 2007
at
12:41
Along its first two cycles of observations (May 2005 - April 2007) the MAGIC
telescope has observed the microquasars GRS 1915+105, Cygnus X-3 and Cygnus X-1. The
first two objects were observed in the target of opportunity mode, relying on alarms
based on their radio fluxes. Cyg X-1 was monitored during 50 hours spanning a period
of ~3 months. We report on the results of these observations.
Presented by Dr. Javier RICO
on
7 Jul 2007
at
13:05
PAMELA was launched on June $15^{th}$ 2006 in a pressurized container on board the
Russian Resurs-DK1 satellite. The satellite is flying in high inclination ($70^o$),
low Earth Orbit (350-600 km), performing measurements in different points and
conditions of the geomagnetosphere. The device is a multi-purpose apparatus
composed of a permanent magnet spectrometer to provide particle ch
... More
Presented by Dr. Marco CASOLINO
on
6 Jul 2007
at
14:45
Most ultra-high energy neutrino experiments using ice as a target medium rely
on the Askaryan effect (coherent impulsive radio Cherenkov radiation from the
charge asymmetry in an electromagnetic shower). This effect was measured
with the Antarctic Impulsive Transient Antenna (ANITA) experiment at the
Stanford Linear Accelerator Center (SLAC) in June 2006. The showers were
produced by 28.
... More
Presented by Mr. Jeff KOWALSKI
on
7 Jul 2007
at
10:42
The Crab nebula was observed with the Whipple 10 m telescope from September
2000 to March 2006 for a total exposure of nearly 200 hours. Standard
calibration and gamma-ray reconstruction methods applied to Whipple 10 m data
are described in detail. Measurements of the total and yearly Crab nebula
flux and energy spectrum are compared with recent results from Cherenkov
telescope systems. C
... More
Presented by Mr. Jeffrey GRUBE
on
6 Jul 2007
at
14:45
The Crab Nebula has proven to be the best tool to calibrate and to characterize the
performance of a Cherenkov telescope. Scientifically, it is interesting to measure
its energy spectrum close to the Inverse-Compton peak where a deviation is expected
from the power law seen at energies above 300 GeV. Additionally, it is important to
search for pulsed emission from the Crab Pulsar at energies
... More
Presented by Ms. Ozlem CELIK
on
6 Jul 2007
at
11:42
An unexpected rise of solar activity close to its minimum in December 2006 resulted
in four X-class flares and four energetic particle events. These events were observed
close to Earth and above 70 degree South by the Ulysses spacecraft, which was at a
heliocentric distance of 2.8 AU at that time. Three out of these four events produced
significant intensity increases up to several hundred MeV
... More
Presented by Prof. A. STRUMINSKY
on
6 Jul 2007
at
14:45
The Draco dwarf spheroidal galaxy has garnered interest as a possible source for the
indirect detection of dark matter. Draco has a large mass-to-light ratio, and its
relative proximity to the Earth provides favorable conditions for the production of
detectable gamma-rays from dark matter self-annihilation in the galaxy's core. The
Solar Tower Atmospheric Cherenkov Effect Experiment (STACEE)
... More
Presented by C. E. COVAULT
on
6 Jul 2007
at
14:45
Since 2005 the giant radio galaxy M87 has been observed in the 100 GeV energy domain
with the MAGIC Telescope. Results from the analysis of those observations will be
presented.
Presented by Mr. Markus MEYER
on
6 Jul 2007
at
14:45
The TeV source J2032+4130 is the first unidentified detection in very high
energy astrophysics and remains so. There have been contradictory claims
regarding its extension, flux level and variability in gamma-rays, although
the longest and most sensitive observation up to now favor a steady, extended
source. MAGIC has devoted more than 80 hours on J2032+4130 observations during
2005 and 2006.
... More
Presented by Dr. Emma OÑA-WILHELMI
on
4 Jul 2007
at
11:06
The VERITAS collaboration has observed the high-frequency-peaked BL Lac object 1ES 1218 +30.4 using an array
of several imaging Cherenkov telescopes located at the Fred Laurence Whipple Observatory in Southern Arizona. A
gamma-ray signal was detected with high significance for the observations taken during several months in the
2006-2007 observing season. Here we present the detection of 1ES
... More
Presented by Dr. Pascal FORTIN
on
9 Jul 2007
at
08:54
Observations of the pulsar PSR B1951+32 with the Solar Tower Atmospheric Cherenkov Effect Experiment
We present the analysis and results of 12.5 hours of high-energy
gamma-ray observations of the EGRET-detected pulsar PSR B1951+32 using
the Solar Tower Atmospheric Cherenkov Effect Experiment (STACEE).
STACEE is an atmospheric Cherenkov detector, in Albuquerque, New
Mexico, that detects cosmic gamma rays using the shower front-sampling
technique. STACEE's sensitivity to astrophysical sources
... More
Presented by John KILDEA
on
6 Jul 2007
at
14:45
We study the capability of the MAGIC telescope to observe under moderate moonlight.
TeV gamma-ray signals from the Crab nebula were detected with the MAGIC telescope
during periods when the Moon was above the horizon and during twilight. This was
accomplished by increasing the trigger discriminator thresholds. No change is
necessary in the high voltage settings since the camera PMTs were espec
... More
Presented by Dr. Emma OÑA-WILHELMI, Dr. Javier RICO
on
9 Jul 2007
at
14:45
We present a preliminary study of the observed 11-year modulation of galactic cosmic
rays for cycle 23. The detectors selected for the analyses have a track record of
stable operations and have median rigidities of response (Rm) covering a wide range
of GCR spectrum. Some of the observed features depend upon Rm while others are
independent of it. The detectors are located at different global s
... More
Presented by Prof. Harjit AHLUWALIA
on
9 Jul 2007
at
12:17
The HAWC (High Altitude Water Cherenkov) observatory is a proposed experiment that
combines a very high altitude site with the developed and proven Milagro water
Cherenkov technology. HAWC is a 150m x 150m pond of water located above 4100 m over
see level with a large field of view and a duty cycle higher than 95%. It observes
the relativistic particles and secondary gamma rays in extensive ai
... More
Presented by Dr. Maria Magdalena GONZALEZ SANCHEZ
on
9 Jul 2007
at
09:30
Presented by Patricio PATRON LAVIADA
on
3 Jul 2007
at
17:00
It is well known that anthropogenic activity can modify the Earth environment
in a global scale. Several restrictions and policies may be adopted in order to
attenuate the contamination effects and protect the environment. However, in
order to design and evaluate the impact of these policies and restrictions in the
human activity, it is important to identify if exists other sources that
... More
Presented by Dr. MANUEL ALVAREZ-MADRIGAL
on
6 Jul 2007
at
14:45
We have observed Crab pulsar in the TeV energy band using the Pachmarhi Array of
Cherenkov Telescopes for about 90 hours. Our observations span about 6 year period
from 2000 to 2006. We have analysed our data with using TEMPO package for analysing
pulsar data. We have searched for eveidence of pulsed emission of gamma rays from
crab pulsar using the contemporaneous radio pulsar parameters. We
... More
Presented by Prof. Bannanje Sripathi ACHARYA
on
6 Jul 2007
at
14:45
Recent observations by atmospheric Cherenkov telescopes such as H.E.S.S., and MAGIC have
revealed a large number of new sources of very-high-energy (VHE) gamma-rays above 100
GeV mostly concentrated along the Galactic plane. At lower energies (100 MeV - 10
GeV) the satellite-based instrument EGRET revealed a population of sources clustering
along the Galactic Plane. Given their adjacent energ
... More
Presented by Dr. Stefan FUNK
on
7 Jul 2007
at
12:17
Recent observations by atmospheric Cherenkov telescopes such as H.E.S.S., and
MAGIC have revealed a large number of new sources of very-high-energy (VHE)
gamma-rays above 100 GeV, mostly concentrated along the Galactic plane. At lower
energies (100 MeV - 10 GeV) the satellite based instrument EGRET revealed a
population of gamma-ray sources clustering along the Galactic Plane.
Here we investi
... More
Presented by Prof. Diego F. TORRES
on
7 Jul 2007
at
12:29
The long-term experiment of the regular balloon cosmic ray monitoring in the Earth’s
atmosphere has been carried out by Lebedev Physical Institute, RAS, Moscow, Russia,
for almost 50 years (since July 1957) and still provides useful data on both galactic
and solar cosmic rays. However there are some flaws in the standard method of data
registration that sometimes hinder getting good data. To
... More
Presented by Dr. Mikhail KRAINEV
on
9 Jul 2007
at
14:45
The non-linear back reaction of accelerated cosmic rays at a non-relativistic
shock front leads to the formation of a smooth precursor with a length scale
corresponding to the diffusive scale of the energetic particles. The
instabilities present in these modified shocks may play a crucial role as past
theoretical work has shown. First, it was claimed that shocklets that could be created
in th
... More
Presented by Mr. Stavros DIMITRAKOUDIS
on
4 Jul 2007
at
14:45
Recent results from the AMANDA experiment yield limits on the extraterrestrial
neutrino flux, based on different analysis methods. A limit on the diffuse neutrino flux is
derived at high energies, i.e.~between 1e4.2 GeV and 1e6.4 GeV. The stacking of different
AGN subclasses gives a point source limits for each of the classes. In this
contribution, a method of interpreting stacking point s
... More
Presented by Ms. Julia BECKER
on
10 Jul 2007
at
13:05
Combining diffusion equation solutions with direct Monte-Carlo
simulations of charged particle trajectories, the propagation of
cosmic rays in the Galaxy is investigated. Different assumptions on
the shape of the regular Galactic magnetic fields and source
distributions are considered and their influence on cosmic-ray
life-times and the energy spectrum obtained at Earth is examined. The
or
... More
Presented by Dr. Joerg HOERANDEL
on
7 Jul 2007
at
09:22
The current status and prospects of deducing the proton-air cross section from
fluorescence telescope measurements of extensive air showers is discussed. As it is
not possible to observe the point of first interaction, X_1, directly, other
observables closely linked to X_1 must be inferred from the measured longitudinal
profiles. This introduces a dependence on the models used to describe the
... More
Presented by Dr. Ralph ENGEL
on
9 Jul 2007
at
12:41
The relationship of long-term cosmic ray modulation with solar activity parameters
such as sunspot group number, their average heliolatitude, tilt of current sheet, and
solar magnetic field strength is analyzed. The period of 1957 - present time is under
consideration. We have used cosmic ray data obtained in the atmosphere at polar and
middle latitudes and the neutron monitor data. It is sho
... More
Presented by Prof. Yuri STOZHKOV
on
9 Jul 2007
at
10:54
In the first part of paper on the basis of NM data for about 4 solar cycles we
investigate hysteresis effects, and separate convection-diffusion and drift
modulations in the suggestion that for NM data primary CR energies the
diffusion time lag may be neglected. Then we determine the relative role of drift
and convection-diffusion effects in the long-term CR variations. In the second
par
... More
Presented by Prof. Lev DORMAN
on
9 Jul 2007
at
12:41
Similar to the GZK cutoff, the dip is a signature of UHE proton
interaction with Cosmic Microwave Radiation (CMB). It is produced
due electron-positron production in collisions of protons with CMB
photons. The dip is located in energy range 1 - 40 EeV. It is
demonstrated that the dip is very well confirmed by the data of
AGASA, Fly's Eye, Hires and Yakutsk detectors. Since
... More
Presented by Prof. Veniamin BEREZINSKY
on
7 Jul 2007
at
10:54
One of the main goals of Solar-Terrestrial Physics is to know how and when the
periodicities of Solar Activity do modulate terrestrial Climatic changes? The
purpose of this study is to examine the cosmophysical periodicities that could
possible be related with a modulation in the number and magnitude of
hurricanes.
Previous efforts on elucidating a plausible contribution of cosmophysica
... More
Presented by Prof. JORGE PEREZ-PERAZA
on
6 Jul 2007
at
14:45
The construction of the IceCube Neutrino Observatory began during the austral summer
of 2004-05, and is expected to continue through 2011. During 2006, nine of the
projected 80 strings were already deployed and taking data, making IceCube an
operational neutrino observatory while still at about 10% of its final size. We
present the first results of a point-source search based on the analysis o
... More
Presented by Dr. Chad FINLEY
on
5 Jul 2007
at
09:47
A new tool monitoring the status of the fluorescence telescopes has been
developed to guarantee smooth operation of all detector components during
data taking. Monitoring data from FD telescopes are collected online
regularly during data acquisition as well as in dedicated modes such as
calibration. They are stored locally in databases that are replicated on a
dedicated central server. A web
... More
Presented by Prof. Karl-Heinz KAMPERT
on
6 Jul 2007
at
14:45
Opacity effects in relativistic sources of high-energy gamma-rays,
such as gamma-ray bursts (GRBs) or Blazars, can probe the Lorentz
factor of the outflow as well as the distance of the emission site
from the source, and thus help constrain the composition of the
outflow (protons, pairs, magnetic field) and the emission
mechanism. The attenuation of high energy photons will be probed by
the
... More
Presented by Mr. JOHANN COHEN-TANUGI
on
10 Jul 2007
at
09:42
The LOPES-30 experiment, located with the air shower experiment
KASCADE-Grande at Forschungszentrum Karlsruhe, Germany, is an array of 30
dipole antennas set-up to investigate the pulsed radio emission from
cosmic ray air showers in the Earth's atmosphere. After one year of
measurements of the East-West polarization by all 30 antennas, recently,
the LOPES-30 set-up was reconfigured to perform
... More
Presented by Mr. Steffen NEHLS
on
6 Jul 2007
at
14:45
The Laser Interferometer Gravitational-Wave Observatory (LIGO) consists of
Fabry-Perot Michelson interferometers designed to measure gravitational
waves at frequencies between 10 Hz and 3 kHz. One potential noise source in
this frequency range is the buildup and motion of surface charge on the optics,
which can be generated through friction with air, contact with other materials,
or int
... More
Presented by Dr. Dennis UGOLINI
on
9 Jul 2007
at
14:45
A new method for high energy cosmic ray detection was suggested by A.E.Chudakov in
1972. According to this method a reflected from the snow surface Cherenkov light is
observed by an optical camera lifted above the surface on the balloon.
Optical system of the SPHERE-2 detector consists of 1500mm diameter spherical mirror
and has 1sr view angle. Shmidt aperture diaphragm allows to reach 109 p
... More
Presented by Dr. Dmitry CHERNOV
on
6 Jul 2007
at
14:45
Current point source searches mostly apply only the direction of the reconstructed
event; furthermore, they reduce available information by grouping events into sky
bins. In this analysis we use a search based on maximum likelihood techniques,
utilizing both event direction and energy, to enhance our ability to detect point
sources. Especially, use of energy information allows us to fit the sp
... More
Presented by Mr. James BRAUN
on
5 Jul 2007
at
11:42
We discuss different models for the origin of the Ultra High Energy
Cosmic Rays (UHECR). The main parameters of the models is the
acceleration spectra of these particles, their chemical composition,
and the maximum energy at acceleration. General astrophysical
parameters such as the extragalactic magnetic fields and the
cosmological evolution of the cosmic ray sources are also relevant and
... More
Presented by Dr. Todor STANEV
on
7 Jul 2007
at
16:30
Recent observations of the Matsushiro deep underground muon telescope indicate that,
the solar diurnal variation (after correcting for the Compton-Getting anisotropy due
to the Earth's orbital motion) has a solar cycle variation and a 0.04\% wave extends
to rigidities as high as several hundreds of GV during solar maximum. We construct a
simple model to simulate the motion of high-rigidity par
... More
Presented by Dr. Jozsef KOTA
on
9 Jul 2007
at
14:45
The Astrophysics Science Project Integrating Research and Education (ASPIRE)
is funded by the National Science Foundation as the public education and
outreach (EPO) component the High Resolution Fly's Eye Cosmic Ray Research
Group. Since 1997, ASPIRE has been creating some of the most engaging and
interactive science lessons and lab activities on the World Wide Web. In
this poster, we will p
... More
Presented by Ms. Julie CALLAHAN, Dr. John BELZ
on
4 Jul 2007
at
14:45
Ulysses, the first spacecraft ever to fly over the poles of the Sun, plays a central
role in the Heliospheric Network, the international fleet of spacecraft to explore
the Sun and Heliosphere. In November 2006, Ulysses, began its passage over
the Sun’s south pole for the third time. Although like during the first polar
passes in 1994/1995 the Sun is again close to its activity minimum, a
... More
Presented by Dr. Olga MALANDRAKI
on
5 Jul 2007
at
09:42
The observation of a possible excess in the cosmic-ray positron
spectrum has been suggested to originate from WIMP annihilations in
the halo of the Galaxy. To measure this spectrum in the interesting
energy range of 1-100 GeV with high precision, we
are developing a dedicated balloon-borne spectrometer (PEBS).
The best measurement of the cosmic-ray positron flux available today
was perform
... More
Presented by Mr. Henning GAST
on
6 Jul 2007
at
10:54
MAGIC, a 17m diameter Cherenkov telescope locating at the La Palma Canary island, is
the biggest IACT (Imaging Atmospheric Cherenkov Telescope) in the world. For lowering
the energy threshold and improving the sensitivity, the MAGIC collaboration is going
to build a second telescope (MAGIC II), using a better sensitivity of
Photomultipliers(PMT). Variety of measurements about different charact
... More
Presented by Mr. Ching-Cheng HSU
on
9 Jul 2007
at
14:45
The IceCube Neutrino Observatory is currently under construction at the South Pole, Antarctica, and 22 strings (of
80) have so far been installed. The observatory is surrounding the AMANDA neutrino telescope, which is running
since 2000. The combination of the AMANDA telescope and the Icecube strings will improve the sensitivity to
neutrinos from Dark Matter annihilation. This paper will di
... More
Presented by Mr. Gustav WIKSTROM
on
9 Jul 2007
at
14:45
PAMELA is a satellite-borne experiment that measures charged particles
cosmic-ray spectra across a wide energy range up to a few hundreds of
GeV. The instrument was launched on the 15^th of June 2006 onboard the
Resurs-DK N.1 satellite. PAMELA instrument consists of a time-of-flight
system, a magnetic spectrometer, a silicon-tungsten calorimeter,a shower detector, a
neutron detector and a
... More
Presented by Dr. Vladimir MIKHAILOV
on
4 Jul 2007
at
14:45
A key problem of cosmic ray astrophysics is the explanation of measured parallel and
perpendicular mean free paths in the heliosphere. Previous approaches used
quasilinear theory in combination with simple turbulence models to reproduce
heliospheric observations. Because of recent progress in transport and turbulence
theory linear and nonlinear diffusion coefficients within an improved dynamic
... More
Presented by Dr. Andreas SHALCHI
on
9 Jul 2007
at
14:45
Long-term variations and short-term fluctuations of cosmic rays affect observations
on board long-lived space missions. We have developed a parameterization of Galactic Cosmic-Ray (GCR) fluxes
for various levels of solar modulation during opposite polarity periods on the basis of experimental data.
In spite of a general agreement among different results on protons, antiprotons, electrons and p
... More
Presented by Dr. Catia Grimani GRIMANI
on
9 Jul 2007
at
10:30
We present the proposal for reanimation of the half-built experimental complex
ANI at Mt. Aragats (Armenia, 3200 m a.s.l.). It is proposed as a first stage to
complete the functioning GAMMA installation by big X-ray emulsion chamber for
detailed study of EAS cores at energies 1-100 PeV.
Preliminary data obtained in this fieled by the Tien Shan “Hadron” installation
are presented.
T
... More
Presented by Prof. Sergey SHAULOV
on
6 Jul 2007
at
14:45
A particle acceleration mechanism in relativistic shock waves by an action of
radiation pressure is discussed. So far many particle acceleration mechanisms
such as diffusive shock acceleration and shock drift/surfatron acceleration have
been studied as an important energy conversion mechanism, but our
understanding how non-thermal particles are generated is still poor. In this
presentat
... More
Presented by Prof. Masahiro HOSHINO
on
7 Jul 2007
at
08:54
A theoretical model of particle acceleration by the interaction of a magnetic field
directional discontinuity and a collisionless shock is presented. The geometry of the
interaction region, the relative angles of the shock, discontinuity, and magnetic
field highly influences the acceleration process. In certain geometries the particles
can re-enter the acceleration region again and again, whic
... More
Presented by Dr. Zoltan NEMETH
on
4 Jul 2007
at
14:45
We present both numerical and semi-analytical results on test-particle
acceleration in multiple parallel shocks. We apply a kinetic Monte Carlo
code and an eigenfunction expansion method to calculate the
distribution functions for electron populations accelerated in
subsequent parallel shocks with thickness varying from infinitely thin
steps to broader modified structures, for shock speeds r
... More
Presented by Dr. Joni TAMMI
on
5 Jul 2007
at
12:17
The understanding of the particle spectra resulting from acceleration in
relativistic shocks as they occur in extragalactic sources is essential for the interpretation of the Cosmic Ray
spectrum above the ankle (E>3*1e18 eV). It is believed that
extragalactic sources like Active Galactic Nuclei and Gamma Ray Bursts can
produce particle spectra up to E~1e21 eV.
In this contribution, subluminal
... More
Presented by Jan LUENEMANN
on
4 Jul 2007
at
14:45
When combining the public available data of cosmic ray arrival directions with
energies above 4x10^19 eV (HiRes energy scale), a broad maximum around 25 degrees
was recently found in the cumulative two-point autocorrelation function. This has
been intriguingly interpreted as the first imprint of the filamentary pattern of
large scale structures (LSS) of matter in the near universe. We analy
... More
Presented by Dr. Pasquale Dario SERPICO
on
7 Jul 2007
at
09:06
We study the features of the power energy spectrum of the 27–day variation of
the galactic cosmic ray intensity by neutron monitors experimental data for
different epoch of solar activity in various polarity periods of solar magnetic
cycles. It is recognized that, averagely, the power energy spectrum of the 27–
day variation of the galactic cosmic ray intensity has tendency to be harder
... More
Presented by Dr. Agnieszka GIL
on
9 Jul 2007
at
14:45
By using an 8-channel custom chip in GaAs technology, over 1.5*10^5 front-end
electronics channels were built, tested and installed in the resistive plate
chambers (RPCs) of the ARGO-YBJ experiment. These channels were designed
to obtain 1 ns time resolution over about 6000 m^2 of sensitive area. Here we
present the design features, the performance and the results during a long
operation
... More
Presented by Prof. Roberto CARDARELLI
on
6 Jul 2007
at
14:45
The surface air-shower array above the IceCube neutrino telescope now
consists of 52 ice Cherenkov tanks at 26 stations spread over an area of 0.22
square kilometer. This paper reports on experience with deployment and
operation of IceTop and describes data that verify the performance, threshold
and energy response of the array.
Presented by Prof. Tom GAISSER
on
5 Jul 2007
at
09:20
We have been developing a gas time projection chamber for the imaging of
gamma-rays between 0.3 - 50 MeV, the Three-Dimensional Track Imager
(3DTI). The detector is being designed for use on satellite experiments for the
imaging of astrophysical gamma-ray sources. Electrons produced by pair
production or Compton scattering ionize the gas and these ionization electrons
are detected by th
... More
Presented by Dr. Seunghee SON
on
9 Jul 2007
at
14:45
The surface detector of the Pierre Auger Observatory will consist of 1600 water
Cherenkov tanks sampling
ground particles of air showers produced by energetic cosmic rays. The construction
of the array is nearly
completed and a large number of detectors have been operational for more than three
years.
In this paper the performance of different components of the detectors are discussed.
Th
... More
Presented by Dr. Tiina SUOMIJÄRVI
on
4 Jul 2007
at
14:45
The simulation of the surface detector of the Pierre Auger Observatory, consisting of
water Cherenkov
detectors, is based on GEANT4. Particles are explicitly tracked through a detector
having realistic geometry.
The simulation is accelerated by a dedicated re-implementation of the tracking of the
numerous Cherenkov
photons inside the tank. The simulated-tank response to cosmic muons at v
... More
Presented by Dr. Piera Luisa GHIA
on
4 Jul 2007
at
14:45
Numerous discrete, small, impulsive solar energetic particle (ISEP)
events with measurable intensities of 3He at energies above 5
MeV/nucleon are observed around the solar maximum of the 11-year solar
cycle. In addition, at times when there are no clearly
distinguishable ISEP events it is common to observe a low,
quasi-steady intensity of 3He at these energies. Recent measurements
under so
... More
Presented by Dr. Mark WIEDENBECK
on
4 Jul 2007
at
11:42
The Milagro experiment observes the extensive air showers produced by very high energy
gamma-rays impacting the Earth’s atmosphere. Milagro uses 898 Hamamatsu R5912
Photomultiplier Tubes. To complete our Monte Carlo simulations, we tested the
photocathode uniformity of our PMTs. The main finding was that the PMT gain and
detection efficiency are a function of the distance from the center of
... More
Presented by Mr. Vlasios VASILEIOU
on
9 Jul 2007
at
14:45
Possibilities of an experimental search for gamma-ray bursts from primordial
black hole (PBH) evaporations in space are reconsidered. It is argued that the
corresponding constraints which can be obtained in experiments with cosmic
ray detectors strongly depend on theoretical approach used for a description of
the PBH evaporation process. Predictions of several theoretical models for
gam
... More
Presented by Prof. Edgar BUGAEV
on
9 Jul 2007
at
13:17
Observations of gamma-rays and neutrons provide information about
acceleration and transport of ions in solar flares. Neutrons from the X17.2 flare
on 2003 October 28 were observed by the ground-based neutron monitor at
Tsumeb in Namibia. This observation was made 5 minutes before the GLE event
produced by the energetic protons. The full time history of gamma rays for this
event was obse
... More
Presented by Dr. Kyoko WATANABE
on
4 Jul 2007
at
14:45
The Telescope Array Low Energy Extension (TALE) Experiment consists of
three detectors which will extend the sensitivity in energy of the
Telescope Array (TA) experiment by two orders of magnitude, from
18.5<log(E)<20.5 (in eV) to 16.5<log(E)<20.5. In addition it will
increase the aperture of the TA experiment at all energies, and double
it at the highest energies. The aim of the experiment
... More
Presented by Prof. Gordon THOMSON
on
10 Jul 2007
at
13:17
The near UV glow of the night atmosphere and near UV transient events in the
atmosphere are sources of the background phenomena in search for ultra high
energy cosmic ray fluorescence signals in the atmosphere. Nature of the UV
atmospheric transient events is not known yet and more experimental data on
them are needed. Study of space-time development of UV transient events is
suggeste
... More
Presented by Mr. Epifanio PONCE
on
6 Jul 2007
at
14:45
Motivated by the importance of the measurement of p+C and pi+C interactions for
tuning hadronic interaction models used in neutrino flux and extensive air shower
simulations, we analyze pion production in p+C and pi+C reactions at 12GeV/c measured
in the fixed target experiment HARP at CERN-PS. We present momentum spectra of
positive and negative pions in the momentum range from 0.5GeV/c to 8.
... More
Presented by Dr. Ralph ENGEL
on
9 Jul 2007
at
12:53
Polarized gamma-rays are expected from a wide variety of sources including
rotation-powered pulsars, accreting black holes and neutron stars, and jet-
dominated active galaxies. Polarization measurements provide a powerful
probe of the gamma-ray emission mechanism and the distribution of magnetic
and radiation fields around the source. No measurements have been performed
in the soft gamma
... More
Presented by Prof. Mark PEARCE
on
6 Jul 2007
at
12:05
The solar activity has been propose as one of the main factors of the climatic
variability. Also another type of processes, the biological ones, have been
proposed as important factor in the climatic variation through the modification
of the cloud albedo. In the present work we used the wavelet analysis to
investigate the relation between the polar concentrations of Methane Sulphonic
Aci
... More
Presented by Mr. Jaime Arturo OSORIO ROSALES
on
9 Jul 2007
at
14:45
Indirect detection signals from dark matter annihilation are studied in the positron channel. We discuss in detail the
positron galactic production spectra and their propagation inside the galactic medium. Predictions for current and
upcoming detectors are provided for neutralino dark matter in a variety of supersymmetric schemes. Correlations
with other indirect detection signals are discu
... More
Presented by Dr. Fiorenza DONATO
on
10 Jul 2007
at
09:06
We examine the Voyager 1 (V1) and Voyager 2 (V2) intensity vs. time
profiles in several energy bands of low-energy particle populations
during the period 2005 through early 2007. There appear to be a set
of propagating structures with ~1 year duration that appear first at
V2, which is upwind of the solar wind termination shock, and then ~115
days later at V1 in the heliosheath. We will d
... More
Presented by A. C. CUMMINGS
on
10 Jul 2007
at
11:06
The cosmic ray energy spectrum is well known to follow a power-law over
many orders of magnitude. The question of whether the spectrum exhibits
a cut-off is of primary importance. Following our Astro. Part. Phys.
publication (astro-ph/0610865), we describe two statistical tests and
apply them to the AGASA and preliminary (ICRC-2005) Auger Cosmic Ray
Energy spectra in an attempt to find d
... More
Presented by John HAGUE
on
4 Jul 2007
at
14:45
Powerful nanosecond light sources based on LED have been developed for
using in astroparticle physics experiments. The light sources use either
matrixes of ultra bright blue InGaN LEDs or new generation high power LEDs. It
is shown that such light sources have light yield of up to 10**11 with very fast
light emission kinetics. Described light sources are important for using in
calibratio
... More
Presented by Mr. Bator SHAIBONOV
on
9 Jul 2007
at
14:45
The Cosmic Ray Energetics and Mass (CREAM) experiment was successfully flown twice on
long-duration balloons from McMurdo, Antarctica, in 2004/05 and 2005/06. During the
second flight, the redundant charge identification system of the instrument (based on
scintillators and silicon detectors) was upgraded with the addition of a second layer
of pixelated silicon sensors. A measurement of the par
... More
Presented by Riccardo ZEI
on
4 Jul 2007
at
09:06
ARGO-YBJ is a "full coverage" air shower detector consisting of
a carpet of Resistive Plate Chambers, located at Yangbajing (4300m a.s.l.).
Using the data collected by the central detector (5800m^2 area)
the cosmic ray shadowing effect due to the Moon is studied.
The comparison of experimental results with Montecarlo simulations is
also discussed.
Presented by Dr. Bo WANG
on
6 Jul 2007
at
08:42
The arriving abundances of a variety of cosmic-ray nuclides consist of
comparable amounts of primary material produced by stellar
nucleosynthesis and secondary matter resulting from fragmentation of
heavier nuclei by collisions during interstellar propagation. In
order to utilize such species in studies of cosmic-ray source
composition it is necessary to determine the secondary fraction
pre
... More
Presented by Dr. Mark WIEDENBECK
on
4 Jul 2007
at
13:05
The shell-type supernova remnant RX J1713.7--3946 was observed during
three years with the H.E.S.S. Cherenkov telescope system. The first
observation campaign in 2003 yielded the first-ever resolved TeV
gamma-ray image. Follow-up observations in 2004 and 2005 revealed the
very-high-energy gamma-ray morphology of this object with
unprecedented precision and enabled spatially resolved spectral
... More
Presented by Dr. David BERGE
on
7 Jul 2007
at
09:42
We present a study of the interaction of low energy electron neutrinos
on nuclei that undergo beta decay. Remarkably, we found that in
the limit of very low neutrino energy the product of the cross section times
the neutrino velocity take values up to $10^{-42}$ cm$^2$ $c$ for some specific
nuclei that decay via allowed transitions. The absence of an energy threshold
and the value of the cros
... More
Presented by Dr. Alfredo Giuseppe COCCO
on
9 Jul 2007
at
14:45
Production cross section of antiprotons in proton-proton collision is presented
for the study of cosmic-ray (CR) antiproton propagation in the Galaxy. We
propose a semi-empirical cross section of antiprotons with only three
parameters, the average multiplicity, the average transverse momentum of
antiprotons, and the deformation parameter, giving the deformation from the
isotropic angula
... More
Presented by Prof. Toru SHIBATA
on
4 Jul 2007
at
14:45
We present results of simulations of muon content in the air showers induced
by very high energy cosmic rays. Muon energy distributions and muon densities
at ground level are given. We discuss a prompt muon component generated by
decays of charmed mesons. The method combines standard Monte Carlo
generators incorporated in the CORSIKA code and phenomenological estimates
of charm hadroprod
... More
Presented by Dr. Jan RIDKY
on
6 Jul 2007
at
14:45
The long-duration balloon flights of TRACER have provided new measurements of the
intensities and energy spectra of the arriving cosmic-ray nuclei with 5 ≤ Z ≤ 26 at
high energies. In order to determine the particle composition and energy spectra at
the cosmic-ray sources, changes occurring during the interstellar propagation of
cosmic rays must be known. We use a simple propagation mode
... More
Presented by Dr. Patrick BOYLE
on
5 Jul 2007
at
11:06
The propagation of UHECRs is affected by the intergalactic magnetic
field that was produced during the course of the large scale structure
formation of the universe. Adopting a novel model based on turbulent
dynamo, the strength of the intergalactic magnetic field is estimated
from local dynamic properties of the gas flows in hydrodynamic
simulations of a concordance LCDM universe. The direc
... More
Presented by Prof. Hyesung KANG
on
6 Jul 2007
at
08:42
We discuss the differences induced by the assumed composition of extragalactic sources on the predicted UHECR
spectrum. We show that in the case of an extragalactic mixed composition, the cosmic ray spectrum can be
reproduced down to the ankle, which is then interpreted as the end of the transition from galactic to extragalactic
cosmic rays. The corresponding Xmax evolution is presented and
... More
Presented by Dr. Denis ALLARD
on
7 Jul 2007
at
09:34
We simulate the arrival distribution of ultra-high-energy (UHE) protons above $10^{19}$
eV by calculating their propagation, considering structured extragalactic magnetic
field (EGMF) with several strengths and a Galactic magnetic field (GMF). We estimate
the most appropriate source number density of UHE protons that reproduces
the small-scale anisotropy observed by Akeno Giant Air Shower Arr
... More
Presented by Mr. Hajime TAKAMI
on
7 Jul 2007
at
11:06
We are proposing the CALET (CALorimetric Electron Telescope) instrument for the observation of high-energy
electrons and gamma rays at the Exposed Facility of the Japanese Experiment Module on the International Space
Station (ISS). The CALET detector consists of an imaging calorimeter with scintillating fibers and tungsten
plates, and a total absorption calorimeter with crystal scintillators.
... More
Presented by Dr. Kenji YOSHIDA
on
9 Jul 2007
at
14:45
The observation of ultra-high energy (UHE) photons above 1 EeV
would open a new window of cosmic-ray research with possible impact
on astrophysics, particle and fundamental physics. The advent of new
giant air shower experiments, particularly the Pierre Auger Observatory,
offers a unique potential to search for such photons.
Status and prospects of experimental photon searches are rep
... More
Presented by Dr. Markus RISSE
on
7 Jul 2007
at
10:30
We present proton-air inelastic cross-section measurement at ultra-high energy using
all available data
collected by the High Resolution Fly's Eye stereo fluorescence detector. A
significantly improved
data reconstruction procedure allows us to minimize the data quality cuts. This
increases the data
statistics available for the measurement and consequently reduces the statistical
error. T
... More
Presented by Dr. Konstantin BELOV
on
9 Jul 2007
at
13:05
Cosmic ray physics in the 10^(12)-10^(15) eV primary energy range is among the main
scientific goals of the ARGO-YBJ experiment. The detector, located in the Cosmic Ray
Observatory of Yangbajing (Tibet, China) at 4300m a.s.l., is a full coverage
Extensive Air Shower array consisting of a carpet of Resistive Plate Chambers (RPC)
of about 5800m^2.
The apparatus layout, performance and locati
... More
Presented by Dr. Ivan DE MITRI
on
9 Jul 2007
at
12:29
Reliable polarization measurements of photons from Gamma Ray Bursts (GRB)
would make the understanding of the GRB phenomenon progress enormously.
POLAR is a concept for an instrument that would enable such a measurement.
We will report about the first results of the performance of a prototype
of this instrument and compare it with Monte-Carlo prediction.
Presented by Dr. Giovanni LAMANNA
on
9 Jul 2007
at
09:18
The space TUS detector of UV fluorescence light radiated by EAS of Ultra
High Energy Cosmic Rays (UHECR) is under preparation. The TUS optical system
will consist of the Fresnel mirror-concentrator of ~2 sq. m. and 256 PMT pixels
as the photo receiver at the mirror focal surface. The 2 PMT pixel prototypes
were tested and used for data taken at the “Universitetsky-Tatiana” and
Compas
... More
Presented by Dr. LEONID TKACHEV
on
6 Jul 2007
at
14:45
The main goal of the CODALEMA experiment, located in the Station de Radioastronomie
de Nançay, France, is the radiodetection of extensive air showers initiated by high
energy cosmic rays using log-periodic antenna and short active dipoles in the 1-200
MHz bandwidth.
First results showed that both antennas are able to detect the transient radio
signals emitted by extensive air showers.
In ad
... More
Presented by Mr. Jacob LAMBLIN
on
6 Jul 2007
at
14:45
Simulations of geosynchrotron radio emission from extensive air showers
performed with the Monte Carlo code REAS1 used analytical parameterisations
to describe the spatial, temporal, energy and angular particle distributions
in air showers. The successor REAS2 replaces these parameterisations with
precise, multi-dimensional histograms derived from per-shower CORSIKA
simulations. REAS2 al
... More
Presented by Dr. Tim HUEGE
on
6 Jul 2007
at
14:45
The CORSIKA programme and specific Monte Carlo collision generators are employed
in the
interpretation of X-ray emulsion chambers data on super gamma ray families at mountain
altitude (Chacaltaya, Kanbala, Pamir...) and in the stratosphere (Concorde, balloons).
The consequences of measurement conditions(energy thresholds levels...) are
detailed to
extract common features for the
... More
Presented by Prof. JEAN-NOEL CAPDEVIELLE
on
9 Jul 2007
at
14:45
Radial variations of quiet-time fluxes of ~1-30 MeV protons are examined at
distances of 2-85 AU using Voyager 1-2 (LECP, CRS) and Ulysses (LET) data.
Attention is focused on the solar cycle minima of 1985-87 and 1995-97.
Gradient values calculated from particle fluxes show an increase between 30
and 70 AU during the recovery phases of galactic cosmic ray intensity. The
energy spectra ch
... More
Presented by Prof. Yu.I. LOGACHEV
on
9 Jul 2007
at
14:45
The Altcriss project aims perform long term measurement of the radiation environment
in different points of the International Space Station. To achieve this goal, it
employs an active silicon detector, Sileye-3/Alteino, to monitor nuclei up to Iron in
the energy range above 40 MeV/n. Both long term modulation of galactic cosmic rays
going toward solar minimum and solar particles events will
... More
Presented by Dr. Marco CASOLINO
on
9 Jul 2007
at
10:42
We consider the internal shock formation in magnetized outflows and we
examine the plastic collision between such relativistic blobs taking
into account a possible dissipation of magnetic flux. We find that
after the collision a large amount of energy is released in
thermal form and consequently we assume that this is transferred
into protons which obtain a relativistic
Maxwellian distribut
... More
Presented by Dr. Apostolos MASTICHIADIS
on
6 Jul 2007
at
14:45
The excellent radiofrequency transparency of cold polar ice, combined with the 'coherent' Cherenkov emission
produced by neutrino-induced showers when viewed at macroscopic wavelengths, has spurred considerable
interest in an ultimate, large-scale radiowave neutrino detector array. Detection of GZK neutrinos will require at
least an order of magnitude improvement in the product of (livetime)
... More
Presented by Ms. Hagar LANDSMAN
on
7 Jul 2007
at
11:30
We explore the sensitivity of a neutrino detector employing strongly directional
high gain antennas to detect the conversion of neutrinos in the 10^16 eV range in a
mountain or the earth crust. The directionality of the antennas will allow both, the
low threshold and the suppression of background. This technology would have the
advantage that it does not require a suitable atmosphere as optic
... More
Presented by Mrs. Olga BRUSOVA
on
9 Jul 2007
at
14:45
The Southern Auger Observatory provides an excellent test bed to study the
radio detection of extensive air showers as an alternative, cost-effective, and
accurate tool for cosmic-rays physics. The data from the radio setup can be
correlated with those from the well-calibrated Auger baseline detectors.
Furthermore, human-induced radio noise levels at the Southern Auger site are
relativel
... More
Presented by Dr. Ad VAN DEN BERG
on
6 Jul 2007
at
14:45
The radio emission from cosmic ray air showers consists in large part of
geosynchrotron radiation. Since the radiation mechanism is based on
particle acceleration, atmospheric electric fields may play an important
role. LOPES results show that electric fields under fair weather conditions
do not alter the radio emission considerably, but during thunderstorms
strongly amplified pulses are meas
... More
Presented by Mr. Stijn BUITINK
on
9 Jul 2007
at
11:10
A series of ice properties' measurements were made in December, 2006 in support of
the balloon-borne ANITA neutrino detection effort. Of particular importance is the
electric field attenuation length in the range 200-1000 MHz as well as signal
transmission across the air-ice boundary. We present measurements of the temperature
profile over the upper 100 meters of ice, radiofrequency attenuatio
... More
Presented by Steven W. BARWICK
on
9 Jul 2007
at
12:17
We study the feasibility of measuring the distance to
an extensive air shower using the fact that shorter
wavelengths undergo more scattering than longer ones.
In principle measuring the spectral distribution of
light arriving at a detector provides information
about the distance to the shower
independent of its brightness or other features.
Such measurements may also provide event-by-
... More
Presented by Dr. Thomas PAUL, Prof. John SWAIN
on
4 Jul 2007
at
14:45
Cosmic ray fluctuations with the periods less than 3 h by data of the EPAM/LEMS120
aboard ACE spacecraft are studied. It is shown that the frequency spectra of cosmic
rays undergo significant dynamic changes caused by the presence of fast magnetosonic
waves in the solar wind. Evidences of generation of fast magnetosonic waves by the
SEP fluxes have been found.
Presented by Dr. Sergey STARODUBTSEV
on
4 Jul 2007
at
14:45
The Kiel Neutron Monitor has been measuring Cosmic Ray intensities for 50
years. Since an upgrade of the counting electronics in the mid 1990's in
collaboration with the IZMIRAN group, measurements have been available with
one minute resolution. However, these measurements are available only up to
one hour after the measurement. We have now set up a second registration
system that is running
... More
Presented by Dr. Christian T. STEIGIES
on
4 Jul 2007
at
14:45
Today the Hybrid Photon Detector (HPD) is one of the few low light level
(LLL) sensors that can provide an excellent single and multiple
photoelectron (ph.e.) amplitude resolution.
The recently developed HPDs from Hamamatsu with a GaAsP photocathode,
namely the R9792U, provide a peak quantum efficiency (QE) of 55% and
a pulse width of ~2 nsec. In addition, the afterpulsing rate of these t
... More
Presented by Mr. TakaYuki SAITO
on
9 Jul 2007
at
14:45
The reconstruction of extensive air showers (arrival direction, core position and
energy estimation) by the
surface detector (SD) of the Pierre Auger Observatory is discussed together with the
corresponding accuracy.
We determine the angular reconstruction accuracy as a function of the station
multiplicity: the resolution
obtained by the SD only is in agreement with the one obtained from h
... More
Presented by Dr. Simone MALDERA
on
4 Jul 2007
at
10:54
Telescope Array (TA) is a EAS detector which is now building in the
western desert in Utah, USA.
In order to estimate the performance of TA, a detailed detector
simulation is being developed in Java. The number
of particles produced during the development of the EAS shower with
various inclinations is calculated by
COSMOS code.
Surface detector (SD) of TA consists of two layers of plastic
... More
Presented by Dr. Nobuyuki SAKURAI
on
6 Jul 2007
at
14:45
The KASCADE-Grande experiment, located at the area of the Forschungszentrum
Karlsruhe, Germany, measures extensive air showers in the energy range between
10^{14} and 10^{18} eV, thus covering the first and the second knee of cosmic rays.
Former analyses of electron and muon data of the original KASCADE experiment revealed
knee-like features in the energy spectra of light elements causing th
... More
Presented by Dr. Holger ULRICH
on
6 Jul 2007
at
12:05
Corotating Interaction Regions are regions in the heliosphere that are formed at the
leading edges of high-speed solar wind streams originating in coronal holes. Their
effects on the propagation of energetic particles are known. Here we concentrate on
the modulation of Jovian electrons by CIRs observed with the Kiel Electron Telescope.
After its launch on Oct. 6, 1990 Ulysses followed an in-ec
... More
Presented by Prof. Bernd HEBER, Mr. R. MÜLLER-MELLIN
on
5 Jul 2007
at
11:18
Recurrent variations and their relation to the solar activity and solar wind
parameters are investigated on the basis of the cosmic ray intensity data
for 4 solar cycles by means of the spectral analysis method.
Presented by Dr. Sardaana GERASIMOVA
on
4 Jul 2007
at
14:45
The atmospheric neutrino is still an important tool in the study
of neutrino physics. The uncertainty of the predicted atmospheric
neutrino flux is caused by the uncertainties in the physical
assumptions and in the calculation scheme.
We discuss them quantitatively, and present the works to reduce them.
The uncertainty related to the hadronic interaction model was
discussed before, the
... More
Presented by Dr. Morihiro HONDA
on
10 Jul 2007
at
12:41
We developed 2D time dependent heliospheric model where particles trajectory are
reconstructed back in time. The model is time dependent due to drifts in the
heliosphere. We followed particles also after escaping the heliosphere in the
interstellar space to found the fraction of them that reenter back again into the
heliosphere. We show how this effect can change the modulation of particles i
... More
Presented by Dr. Pavol BOBIK
on
9 Jul 2007
at
08:54
The Cosmic Ray Energetics And Mass (CREAM) is a balloon-borne experiment
designed for direct measurement of high energy cosmic rays with energy up to
10^15 eV. CREAM incorporates a sampling tungsten/scintillating-fiber
calorimeter for energy measurements and a dual-layer Silicon Charge Detector
(SCD) and Timing-based Charge Detector (TCD) to measure the charge of
incident particles. CREA
... More
Presented by N.H. PARK
on
4 Jul 2007
at
14:45
The ATIC balloon-borne experiment measures the energy spectra of
elements from H to Fe in primary cosmic rays from about 100 GeV to 100
TeV. ATIC is comprised of a fully active bismuth germanate
calorimeter, a carbon target with embedded scintillator hodoscopes,
and a silicon matrix that is used as a main charge detector. The
silicon matrix produces good charge resolution for the proton
... More
Presented by Dr. A. D. PANOV
on
4 Jul 2007
at
09:18
The modeling analysis of 15 large GLEs occurred in the period 1956-2006 on
the data of the worldwide neutron monitors has been performed. In all studied
cases two distinct RSP populations (components) were revealed: the early
impulse-like intensity increase with exponential energy spectrum (prompt
component, PC), and the late gradual increase with a softer energy spectrum of
the power la
... More
Presented by Prof. Eduard VASHENYUK
on
6 Jul 2007
at
14:45
PSR B 1259-63/SS2883 is a binary system consisting of a 48ms radio pulsar orbiting a
Be star with a period of 3.4y in a highly eccentric orbit (e = 0.87). The system was
first detected in very-high-energy (VHE) gamma-rays by H.E.S.S. around the last
periastron passage in March 2004 (March 7, 2004). These observations established PSR
B1259-63/SS2883 as the first variable galactic source in the
... More
Presented by Mr. Matthias KERSCHHAGGL
on
6 Jul 2007
at
09:42
IceTop is the surface component of the IceCube neutrino telescope at the South Pole.
It will serve as an air-shower array that consists of cylindrical tanks of clear ice.
Electrons, positrons, gamma rays and muons produce Cherenkov radiation directly or
through interaction products. It is therefore important to have a good understanding
of these processes. A thorough knowledge will permit the
... More
Presented by Mr. Peter NIESSEN
on
6 Jul 2007
at
14:45
The Search for Antimatter in the galactic cosmic radiation is one of the main
scientific objectives of the BESS-Program. A flatter antiproton spectrum below the
secondary production peak at 1 GeV would suggest novel antiproton source, such as
evaporating black-holes or decaying super-symmetric particles. The BESS-Polar
experiment is designed as a highly transparent magnetic rigidity spectromet
... More
Presented by Dr. Thomas HAMS
on
4 Jul 2007
at
09:42
Since 1983, the Whipple 10m Gamma-ray Telescope was operated with a
full observing program. During that time, five new sources of very
high energy (VHE; E > 100 GeV) emission were discovered; spectral and
temporal characteristics of five blazars were established and many
other potential sources were studied in detail. In September 2005, the
observing program was redefined and the 10m was dedi
... More
Presented by Dr. David STEELE
on
9 Jul 2007
at
10:54
The Advanced Thin Ionization Calorimeter (ATIC) long duration balloon
experiment had a successful science flight accumulating 18 days of data (12/02 -
1/03) during a single circumnavigation in Antarctica. ATIC measures the energy
spectra of elements from H to Fe in primary cosmic rays using a fully active
Bismuth Germanate calorimeter preceded by a carbon target, with embedded
scintillat
... More
Presented by Prof. John WEFEL
on
4 Jul 2007
at
14:45
The Alpha Magnetic Spectrometer (AMS) experiment to be installed on the
International Space Station (ISS) will be equipped with a proximity focusing
Ring Imaging Cherenkov (RICH) detector for measuring the charge and velocity of
incoming cosmic-ray nuclei. From top to bottom, the detector consists of a
radiator plane made of 1.05 aerogel and sodium fluoride (NaF) materials, an
expansion volu
... More
Presented by Dr. A. MALININ
on
4 Jul 2007
at
14:45
We give an update on the most recent design of the "School
Cosmic Ray Outreach Detector'' (SCROD) using pixellated
Geiger-mode avalanche photodiodes and scintillating tiles
with wavelength shifting fibers as detectors. This technology
offers very high levels of robustness at low cost. Voltages
and currents are also so low as to reduce shock hazard to
zero, and there are no fragile glass or
... More
Presented by Prof. John SWAIN
on
4 Jul 2007
at
14:45
Gradual solar energetic particle (SEP) events are believed to be accelerated at CME
driven shocks. Shocks driven by a realistic CMEs are neither simply
quasi-perpendicular nor
quasi-parallel: the geometry and the shock strength may constantly change as the CME
evolves. The shock is likely to be quasi-parallel when it forms and becomes more
parallel at later stages (e.g. Lee and Tylka 2005).
... More
Presented by Dr. Jozsef KOTA
on
5 Jul 2007
at
10:54
Recently, the times from CME to onset, the rise times and durations of 20 MeV
proton events observed on the Wind spacecraft during 1998-2002 were
compared with ambient solar wind O+7/O+6 values to search for correlations
with solar-wind (SW) stream types. Here we compare the same three SEP
timescales with their associated SW components classified as high-speed
streams, slow wind, and tr
... More
Presented by Stephen KAHLER
on
5 Jul 2007
at
08:42
Presented by Dr. Berndt KLECKER
on
11 Jul 2007
at
08:30
Presented by Prof. Erwin FLUECKIGER
on
11 Jul 2007
at
11:30
Presented by Dr. Alan CUMMINGS
on
11 Jul 2007
at
15:30
Using a solar proton database for the past five solar cycles (1954-2007) we
have determined the total solar proton fluence above 10 and 30 MeV and the
number of discrete events that occurred each cycle. We find:
(1) The number of discrete events in cycles 19-22 were essentially the same;
(2) Cycles 20 and 21,at the beginning of the space era, were relatively benign
with respect to solar
... More
Presented by Dr. Margaret SHEA
on
6 Jul 2007
at
12:17
Using nitrate enhancements in the polar ice as a proxy for solar proton events,
we have determined the proton fluence above 30 MeV for 31 solar cycles
between 1610 and 1954 (cycle -12 through cycle 18). Our results show a wide
range of solar proton fluences over these 31 solar cycles, from three cycles with
no significant proton events above 10**9 protons/cm to a high of 38 x 10**9
prot
... More
Presented by Dr. Margaret SHEA
on
7 Jul 2007
at
11:06
We present the analysis and results of recent high-energy gamma-ray
observations of the high energy-peaked BL Lac (HBL) object 1ES 1218+304 with
the Solar Tower Atmospheric Cherenkov Effect Experiment (STACEE). 1ES
1218+304 is an X-ray bright HBL at a redshift
z=0.182, and has been predicted to emit high energy gamma rays above
100 GeV, detectable by ground-based Cherenkov telescopes. Recent
... More
Presented by Reshmi MUKHERJEE
on
6 Jul 2007
at
14:45
Two major Forbush Derease events were recorded –one on 15 May and other
on 9 November 2005, of magnitudes 18% and 12% respectively. We have
taken the data for cosmic ray intensity from Neutron Monitor stations at Oulu
and Mawson,Antartica.In the present paper an analysis of the relation of FDs to
the sources and different parameters of the interplanetary medium and
geospace is studied.
... More
Presented by Dr. M.L CHAUHAN
on
4 Jul 2007
at
14:45
JEM-EUSO space observatory will have a very large exposure factor in several years, which is far exceeding the
critical exposure factor required for observation of most of the sources within a few hundred Mpc. The main
science objective is the source identifying atsronomy in particle channel. Quasi-linear tracking of the sources
becomes feasible at energy > 10^20 eV for all-sky. Acceleration
... More
Presented by Prof. Yoshiyuki TAKAHASHI
on
10 Jul 2007
at
09:18
Milagro is a wide field (2 sr) high duty cycle (>90%) ground based water Cherenkov
detector built to observe extensive air showers produced by high energy particles
interacting in the Earth's atmosphere. Milagro records extensive air showers in the
energy range 100 GeV to 100 TeV, as well as the counting rates of the individual
photomultiplier tubes in the detector. The individual tube countin
... More
Presented by Mr. Taylor AUNE
on
9 Jul 2007
at
12:41
The Pierre Auger Observatory, with an array of currently more than a thousand
Cherenkov detectors filled with 12 m^3 of water, can detect the putative high energy
emission of a GRB (photons down to a few hundreds of MeV) by the so-called "single
particle technique", through a coherent increase in the average background particle
rates over the whole array, due to secondary particles in the phot
... More
Presented by Dr. Xavier BERTOU
on
4 Jul 2007
at
14:45
ARGO-YBJ is a "full coverage" air shower detector consisting of a 6700 m^2
carpet of Resistive Plate Chambers, located at Yangbajing (Tibet, P.R. China,
4300 m a.s.l.).
Its large field of view (~2 sr) makes ARGO-YBJ particularly suitable to
detect unpredictable and short duration events such as Gamma Ray Bursts.
ARGO-YBJ can search for GRBs using two detection techniques: the "Scaler
Mod
... More
Presented by Dr. Piero VALLANIA
on
6 Jul 2007
at
14:45
We have searched for intermediate-scale anisotropy in the data of
the HiRes experiment, in particular the monocular data from the
HiRes-II detector. These data were collected between December, 1999,
and August, 2005. We see a deficit of events near the direction of
the galactic anticenter, very close to the location of the deficit
seen by AGASA. Because of low exposure in summer months we
... More
Presented by Prof. Gordon THOMSON
on
4 Jul 2007
at
09:30
The AGASA collaboration has presented results that indicate the presence
of large-scale anisotropy in the arrival direction of ultra-high-energy
cosmic rays. While this data has been interpreted as an enhancement from
the Galactic Center and the Cygnus region and a deficit from the Galactic
anti-Center their map indicates a possibly much larger affect.
Independent of the AGASA data, the
... More
Presented by Dr. Petra HUENTEMEYER
on
4 Jul 2007
at
14:45
The Antarctic Muon And Neutrino Detector Array (AMANDA) is a Cherenkov
detector deployed in the Antarctic ice cap at the South Pole.
The charged-current interaction of high-energy electron or tau neutrinos,
as well as neutral-current interactions of neutrinos of any flavor, can
produce isolated electromagnetic or hadronic cascades.
There are several advantages associated with the cascade chan
... More
Presented by Oxana TARASOVA
on
5 Jul 2007
at
11:18
We present recent results of a search for pulsed very-high-energy (VHE) gamma-ray
emission from pulsars using data taken with the High Energy Stereoscopic System
(H.E.S.S.), an array of imaging Cherenkov telescopes located in Namibia. The data
set, accumulated during four years of operation until 2006, comprises observations of
eleven young pulsars, selected according to their spin-down lumino
... More
Presented by Mr. Matthias FUESSLING
on
6 Jul 2007
at
14:45
Cherenkov emissions of magnetic charges moving through matter will exceed those of
electric charges by several orders of magnitude. The AMANDA neutrino telescope is
therefore capable of efficiently detecting relativistic magnetic monopoles that pass
through its sensitive volume. We present a new limit on the flux of relativistic
magnetic monopoles based on the analysis of one
year of data tak
... More
Presented by Henrike WISSING
on
5 Jul 2007
at
12:53
The Short GAmma Ray Front Air Cherenkov Experiment is designed to search for bursts
of gamma rays above 200 MeV lasting from 60 nanoseconds to longer than 20
microseconds. The custom-designed trigger and data-acquisition system of SGARFACE
piggy-backs on the existing Whipple 10m telescope. The experiment has operated for
more than 3 years during which time about 1.2 million events were recorde
... More
Presented by M SCHROEDTER
on
5 Jul 2007
at
13:17
In this analysis 3329 neutrino events detected by AMANDA-II during the years
2000-2003 are analysed for anisotropies or unexpected structures in their arrival
direction. The structures could arise due to the presence of a signal from many weak
and therefore unresolved cosmic neutrino sources, extended sources or a few brighter
sources.
For the first time a technique, well known from the ana
... More
Presented by Jan-Patrick HÜLß
on
9 Jul 2007
at
14:45
A search for supernova neutrino bursts was conducted using data from the
Super-Kamiokande (SK) detector. SK detector is an imaging water Cherenkov
detector containing 50,000 tons of pure water with 22,500 tons of fiducial
volume, and it is sensitive to core-collapse supernova explosions
via observation of their neutrino emissions. The expected number of events
comprising such a burst is
... More
Presented by Mr. Motoyasu IKEDA
on
5 Jul 2007
at
10:54
Supernova relic neutrinos (SRN) is diffuse supernova neutrino background from
all past supernova. No experiments have succeeded in detecting SRN yet.
Measurement of SRN enable us investigate history of past supernova. For
example, the flux of SRN shows star formation rate and supernova rate in
galaxies.
A search for SRN was conducted using Super-Kamiokande (SK) data. SK is a
large water
... More
Presented by Takashi IIDA
on
5 Jul 2007
at
11:06
The South Pole Air Shower Experiment (SPASE-2) began operation in 1996 and took data
until it was decommissioned in December, 2006. We are currently analyzing some 200
million reconstructed events taken between 1997 and the end of 2006. In this paper we
report on a search for 100 TeV gamma-rays from three specific Southern hemisphere
point sources discovered by H.E.S.S. to have gamma-ray spect
... More
Presented by Dr. Xinhua BAI (*!)
on
4 Jul 2007
at
11:18
Dwarf Sphreroidal galaxies are amongst the best target to search for a Dark Matter
annihilation signal. The annihilation of WIMPs in the center of Sgr dwarf would
produce high energy gamma-rays in the final state. Observations carried out with the
H.E.S.S. array of Imaging Atmospheric Cherenkov telescopes are presented. A careful
modelling of the Dark Matter halo profile of Sgr dwarf was perfo
... More
Presented by Dr. Emmanuel MOULIN
on
10 Jul 2007
at
09:30
The KASCADE-Grande experiment, located on site of the Forschungszentrum Karlsruhe in
Germany, is a multi-detector setup for measuring extensive air showers of primary
energies up to 1 EeV. The main component for measuring showers of the highest
energies is the newly added Grande array, which consists of 37 scintillation detector
stations, spanning an area of nearly 0.5km². Based on the recon
... More
Presented by Dr. Andreas HAUNGS
on
4 Jul 2007
at
14:45
The data collected by the Pierre Auger Observatory are analyzed to search for
correlations between the arrival directions of high-energy cosmic rays and the
positions in the sky of astrophysical transients. Special attention is directed
towards gamma-ray observations recorded by NASA's Swift mission, which have an
angular resolution similar to that of the Auger surface detectors.
Presented by Prof. Luis ANCHORDOQUI
on
4 Jul 2007
at
14:45
Several analyses of the data collected by other experiments have
found an excess of cosmic rays in correlation with subclasses of
BL Lacs. We test these analyses with the data from the Pierre
Auger Observatory, and report on the results of our searches.
Presented by Dr. Diego HARARI
on
4 Jul 2007
at
13:05
Many of the unidentified Egret sources are believed to be young pulsars.
Such young not-identified pulsars should be surrounded by pulsar wind
nebulae which are at present well established TeV gamma-ray sources
(like Vela X, MSH 15-52 and G0.9+0.1). Moreover, other type of
gamma-ray sources are likely, i.e. binary systems, molecular clouds,
supernovae
remnants, massive stars. The Milagro exp
... More
Presented by Mr. Hendrik BARTKO
on
4 Jul 2007
at
10:30
SNRs in general, and in particular, those SNRs which might
be physically related with EGRET sources were chosen as a
target for observations with the MAGIC telescope. Here we
report about the searches for VHE gamma-ray emission from
the SNRs IC443, W66 and W44.
We briefly describe the observational strategy, the procedure
implemented for the data analysis, and discuss the results.
Presented by Mr. Hendrik BARTKO
on
4 Jul 2007
at
13:05
We use more than two years of data from the Pierre Auger
Observatory to search for anisotropies on large scales in
different energy windows above 1 EeV. We account for various
systematics in the acceptance, in particular due to weather
variations. We present the results of analyses and consistency
checks looking for patterns such as right ascension modulations.
Presented by Dr. Eric ARMENGAUD
on
4 Jul 2007
at
12:55
A search for neutron-antineutron oscillation, a |delta B| = 2 process predicted
by L-R symmetric gauge theories, was undertaken using the 24.5 x 10^33
neutron-years of exposure in run one of Super-Kamiokande. When
incorporating most major sources of systematic and statistical errors we
calculate the upper limit on the oscillation lifetime of neutrons in oxygen to be
1.78 x 10^32 years at
... More
Presented by Prof. Kenneth GANEZER
on
9 Jul 2007
at
14:45
If non-baryonic dark matter exists in the form of neutralinos, a neutrino flux is
expected from the decay of neutralino pair annihilation products inside heavy
celestial bodies. Data taken with the AMANDA-II neutrino telescope located at the
South Pole can be used in a search for this indirect dark matter signal. We will
present current results from searches for neutralinos accumulated in th
... More
Presented by Mr. Daan HUBERT
on
10 Jul 2007
at
09:18
The Large Volume Detector LVD (Gran Sasso National Laboratory, Italy) is a neutrino scintillator observatory
monitoring the Galaxy since 1992, searching for low energy neutrino bursts from gravitational stellar
collapses. We present the status of the detector that reached its final active mass of 1000 t in 2001. No
candidates have been detected over all the fifteen years of observation: the
... More
Presented by - THE LVD COLLABORATION
on
5 Jul 2007
at
13:19
CUORICINO is a cryogenic detector running in Gran Sasso National Laboratories, Italy
since 2003.
With its 40.7 kg of 130TeO2 mass, in the form of an array of 62 crystals it has
proved the feasibility of CUORE experiment, whose aim is to be sensitive to value of
the effective neutrino mass as low as few tens of meV.
It has moreover set the currently lower limit on the lifetime of 130Te for
n
... More
Presented by Dr. Elena GUARDINCERRI
on
5 Jul 2007
at
12:05
The Antartic Neutrino Telescope AMANDA and its succesor IceCube can be used for
searches for cosmic point sources of neutrinos with a wide range of energy. The
highest of these energy bands spans from about 10^5 to 10^10 GeV. Several
source models predict a significant neutrino flux in this part of the spectrum, for
example from Active Galactic Nuclei. Since the interaction length of these neu
... More
Presented by Mrs. Elisa BERNARDINI
on
9 Jul 2007
at
14:45
The GRAPES-3 experiment observes extensive air showers using a high-density array of
scintillators and a large area tracking muon detector. The array consists of 300
scintillation detectors (each 1m^2 in area) and 16 modules of muon detectors having a
total area of 560m^2. We have developed a new method of detector time offset
correction to
improve the angular resolution of the array by usin
... More
Presented by Mr. Akitoshi OSHIMA
on
6 Jul 2007
at
14:45
The space satellite GLAST is expected to play a crucial role in indirect Dark Matter searches, thanks both to its ability
to perform observations at energy scales comparable to the mass of common dark matter candidates and to its
potential of making deep full-sky maps in gamma-rays, thanks to its large field-of-view. Here we will describe the
prospects for detecting gamma-rays from point sou
... More
Presented by Dr. Aldo MORSELLI
on
10 Jul 2007
at
10:54
Pulsed emission of gamma/X rays from Geminga pulsar were detected earlier at the
period of ~237 msec using EGRET/ROSAT instruments. However, there are conflicting
reports about emission of pulsed gamma rays from this pulsar at very high energies.
We have observed this source for about 56 hours using the PACT setup during the last
6 years spanning c. 2000 to 2006. This pulsar was found to und
... More
Presented by Prof. Bannanje Sripathi ACHARYA
on
6 Jul 2007
at
14:45
We observe the steady emission of multi-TeV gamma rays from
the crab nebula from observation of the Tibet air shower array.
In this conference, we will also report that no evidence for long-term
variability of flux intensity from the Crab Nebula is found.
In this article, we will present the result that a search for pulsed
multi-TeV gamma rays emission from crab pulsar using data taken
wi
... More
Presented by Prof. Kinya HIBINO
on
6 Jul 2007
at
14:45
It was surprising that Gigantic solar flares exceeding X-class occurred 10 times
in September, 2005, because the activity of the Sun had already been in the
declining period. More surprisingly, 4 X-class solar flares occurred in December,
2006, when the activity of the Sun was at the minimum. It is expected that
some of these flares were accompanied by the acceleration of ions, which
wou
... More
Presented by Dr. Yutaka MATSUBARA
on
4 Jul 2007
at
09:42
Data taken at the Pierre Auger Observatory are used to search for air
showers initiated by ultra-high energy (UHE) photons.
The results of
searches for UHE photons are reported from hybrid observations
(fluorescence and array detectors). Additionally, using the larger
data set from the array detectors alone, a more stringent test of
predicted large photon fluxes is presented.
Presented by Matthew HEALY
on
4 Jul 2007
at
12:15
One interesting possibility is that the galactic center source HESS J1745-290
is associated with the galactic center source Sgr A*, the galactic center black
hole, in which case we may expect variability as seen in IR and X-rays, with
QPO frequencies predicted by Aschenbach et al. (2004). We will present the
results of a search for such variable signatures using HESS observations of this
sou
... More
Presented by Prof. Ocker DE JAGER
on
6 Jul 2007
at
14:45
The origin of the ultra-high energy cosmic rays (UHECRs; several times 10^19 eV and
higher) is an open question
in the astroparticle physics. So far no astrophysical object has been still
identified as UHECR sources within a limited
source distance of several tens of Mpc by the Grisen-Zatsepin-Kuzmin effect. In
accelation of such particles, the
very high energy (VHE) gamma-ray emission
... More
Presented by Dr. Kenji Shinozaki SHINOZAKI
on
6 Jul 2007
at
14:45
The Gould belt, a well-known region of enhanced star formation in the solar
neighborhood, is observed to be an expanding rim with a diameter of a few
hundred parsecs and a width of approximately 100 pc. Most of the nearby
OB stellar associations and molecular clouds are found to be
aligned with the Gould belt. With the high star formation rate along the
Gould belt, the local supernova rate
... More
Presented by Dr. D. HORNS, Dr. G. P. ROWELL
on
6 Jul 2007
at
14:45
Westerlund 1 is a unique case of a massive young cluster with at least 11
Wolf-Rayet stars driving strong stellar winds. It is possible that various
configurations of these stellar winds (wind-wind interaction, superposition of
stellar winds etc.) can convert a fraction of the kinetic energy of the wind
into accelerated particles. Observations of spatially extended non-thermal
X-ray emiss
... More
Presented by Dr. Dieter HORNS
on
6 Jul 2007
at
14:45
Laser Interferometer Gravitational Wave Observatory (LIGO) consists of
three detectors, located in Hanford, Washington and Livingston, Louisiana,
which are designed to search for gravitational waves from astrophysical
sources. In November 2005, LIGO started col
... More
Presented by Dr. Shantanu DESAI
on
5 Jul 2007
at
12:41
The Pyramid of the Sun, at Teotihuacan, Mexico, is being searched for possible
hidden chambers, using a muon tracking technique inspired in the experiment
carried out by Luis Alvarez over 30 years ago at the Chephren Pyramid, in Giza.
A fortunate similarity between this monument and the Pyramid of the Sun is a
tunnel, running 8 m below the base and ending close to the symmetry axis,
whic
... More
Presented by Dr. Arturo MENCHACA-ROCHA
on
5 Jul 2007
at
09:06
The secondary electron flux at altitude below 10 g/cm^2 is estimated
using the result of atmospheric gamma ray spectrum above 30GeV,
which has been obtained by our emulsion chamber experiments at balloon
altitudes. We have to subtract these electrons produced by nuclear
interactions from the observed electrons, when deriving the primary
electron spectrum in the Galaxy.
In addition, for
... More
Presented by Dr. yoshiko KOMORI
on
4 Jul 2007
at
14:45
The water Cherenkov tanks of the Pierre Auger Observatory can detect particles at all
zenith angles and are therefore well suited for the study of inclined and horizontal
air showers (60° < theta < 90°). Such showers are characterised by a
dominance of the muonic component at ground, and by a very elongated and asymmetrical
footprint which can even exhibit a lobular structure due to the ben
... More
Presented by Dr. David NEWTON
on
4 Jul 2007
at
14:45
The primary proton spectrum up to 100 TeV has been investigated by
balloon- and satellite-borne instruments. Above this energy range
only ground-based air shower arrays can measure the cosmic ray
spectrum with a technique moderately sensitive to nuclear
composition. An array which exploits the full coverage approach at
very high altitude can achieve an energy threshold well below the
TeV reg
... More
Presented by Dr. Giuseppe DI SCIASCIO
on
4 Jul 2007
at
14:45
We present a detailed leptonic model for the spectral evolution of TeV blazars.
Synchrotron emission is modelled, with the TeV component explained by both Inverse
Compton upscattering of synchrotron photons and photons originating externally to the
jet. The Broad Line Region and accretion disc are considered for the source of soft
external target photons. We investigate the effects on the emis
... More
Presented by Ms. Ana MILOVANOVIC
on
6 Jul 2007
at
14:45
Ground based telescopes have marginally observed very high energy emission (>100GeV)
from gamma-ray bursts(GRB). For instance, Milagrito observed GRB970417a with a
significance of 3.7 sigmas over the background. Milagro have not yet observed TeV
emission from a GRB with its triggered and untriggered searches or GeV emission with
a triggered search using its scalers. These results suggest the n
... More
Presented by Dr. Maria Magdalena GONZALEZ SANCHEZ
on
6 Jul 2007
at
14:45
The observation of high energy neutrinos would be a significant constraint for
non thermal processes in astrophysical sources (active galactic nuclei,
supernovae remnants…). Moreover it would also be the evidence for cosmic ray
acceleration inside our galaxy. Recent precise measurements of the cosmic
gamma-ray spectrum above 1 TeV with the High Energy Stereoscopy System
(H.E.S.S.) inst
... More
Presented by Mr. rezo SHANIDZE
on
9 Jul 2007
at
14:45
The Tibet air shower array, consisting of 533 scintillation counters
which are placed in a lattice with 7.5 m spacing, has been in
operation since 1999 at Yangbajing in Tibet, China at an altitude of
4,300 m above sea level. In this conference, we will report on the
continuous observation of multi-TeV gamma rays from the Crab Nebula
with the Tibet air shower array. We found no evidence for
... More
Presented by Dr. Masato TAKITA
on
6 Jul 2007
at
14:45
SiPM is the novel solid state photodetector which can be operated
in the single photon counting mode. It has excellent features,
high quantum efficiency, good charge resolution, fast response,
very compact, high gain of 10^6, very low power consumption,
immune to the magnetic field and low bias voltage, typically 60V.
Drawbacks of this device are currently the large dark current,
cross
... More
Presented by Prof. Masahiro TESHIMA
on
10 Jul 2007
at
12:41
The sidereal daily variation is investigated by using the continuous observation
data of ground and underground (7, 20 and 60 m w.e.) muon cosmic ray
intensities for the 1972 to 2001 period. The results obtained are discussed in
the light of the supposed sources of heliospheric and galactic origin.
Presented by Dr. Sardaana GERASIMOVA
on
9 Jul 2007
at
14:45
Daily temperature variation in the electronic box of the surface detector in the
Pierre Auger Observatory may reach more than 40ºC, which causes a significant
variation of the pedestal of FADC traces. Pedestal variation, more than 5 ADC–
counts in full temperature range, could significantly affect the trigger conditions
especially for the Time-over-Threshold Trigger working at very low t
... More
Presented by Dr. Zbigniew SZADKOWSKI
on
6 Jul 2007
at
14:45
The balloon-borne ANITA neutrino telescope completed a successful 35-day
flight during the 2006-2007 austral summer. The primary goal of ANITA is to
search for evidence of ultra high-energy neutrinos (E > 10^19 eV) interacting
in the Antarctic ice sheets. In this paper, we present preliminary results of the
simulated sensitivity of ANITA, incorporating the actual flight path, geographic
... More
Presented by D. GOLDSTEIN
on
9 Jul 2007
at
14:45
TenTen is a proposed array of Imaging Atmospheric Cherenkov Telescopes (IACT)
optimised for the gamma ray energy regime above 10 TeV. It will offer a collecting
area of 10 km^2 above energies of 10 TeV. In the initial phase, a cell of 3 to 5
modest-sized telescopes, each with 10-20 m^2 mirror area, is planned for an
Australian site. A possible expansion of the array would
comprise many such c
... More
Presented by Mr. Victor STAMATESCU
on
9 Jul 2007
at
14:45
Antarctic Ross Ice Shelf ANtenna Neutrino Array (ARIANNA) is a new concept of a large
radio telescope which consists of 10,000 broadband antenna stations located on the
surface of the Ross Ice Shelf in Antarctica. Primary goals of ARIANNA are to test the
GZK (Greisen-Zatsepin-Kuzmin) neutrino production and to measure the neutrino
cross-section near 100 TeV. We present here a Monte Carlo simul
... More
Presented by J. NAM
on
9 Jul 2007
at
14:45
We use CORSIKA+Herwig simulation code to produce ultra-high energy neutrino
interactions in the atmosphere. Our aim is to reproduce extensive air showers
originated by extragalactic tau-neutrinos. As we have no code available which can
simulate the tau-neutrino as primary particle in the atmosphere, we use muon-neutrino
as primaries. For charged current tau-neutrino interactions in the atmosph
... More
Presented by Dr. Celio ADREGA DE MOURA
on
5 Jul 2007
at
12:57
Earth-skimming neutrino experiment such as NuTel or CRTNT detects air
shower, which is produced by decay of tau lepton, from near horizontal
direction. Traditional shower simulations have difficulty in simulating shower at
zenith angle near 90 degree, where some variables diverge to infinity. Recent
CORSIKA simulation code had updates on simulation of horizontal air shower.
We also deve
... More
Presented by Dr. TsungChe LIU
on
6 Jul 2007
at
14:45
Diffuse VHE γ radiation from the Galactic center ridge observed by the H.E.S.S.
telescope has been convincingly linked with the propagation of recently accelerated
cosmic rays that interact with molecular hydrogen clouds during their diffusion.
Through a series of time-dependent simulations of that diffusion for different
propagation parameters we have obtained the most probable values of the
... More
Presented by Mr. Stavros DIMITRAKOUDIS
on
5 Jul 2007
at
11:42
The WILLI calorimeter, installed in NIPNE Bucharest, is operated since
several years for measuring low energy (E<1GeV) charge ratio of atmospheric
muons, including its directional dependence. Recently a project was proposed
to combine WILLI with a mini-array of 12 scintillators in order to measure muon
charge ratio in EAS. This experiment could provide further information on
shower develop
... More
Presented by Mr. Bogdan MITRICA
on
9 Jul 2007
at
14:45
The identification of the primary particle type can provide important clues about the
origin of ultra-high energy (UHE) cosmic rays above $10^{18}$ eV.
The depth of shower maximum of the air shower profile offers a good discrimination
between different primaries. This observable, which was recently used to obtain a
limit to photons from data taken by the Pierre Auger Observatory, is usually
e
... More
Presented by Dr. Markus RISSE
on
4 Jul 2007
at
14:45
It has previously been suggested that the Jicamarca Radio Observatory (JRO) could be
used for the detection of extended air showers using radar echo [1]. The use of radar
is appealing as it could allow to map the longitudinal development of air showers
through the atmosphere. This paper presents studies on the implementation of an array
of particle detectors (scintillator, water tank) at the J
... More
Presented by Dr. David WAHL
on
6 Jul 2007
at
14:45
Results of the computations of the response of the scintillator detector to high
energy photons using the code GEANT-3 is presented. The dependence of
efficiency on energy is obtained for a given geometry of the detector and for
different angular distributions of incident flux. The expectations of the response
in wide energy channels for various primary energy spectra is obtained. The
e
... More
Presented by Prof. Karel KUDELA
on
4 Jul 2007
at
14:45
Radio signals produced in ice by electromagnetic cascades with energies up to
10^15 eV have been calculated. Simulations of cascades were performed using
the SIMEX Code System. The simulation results in the matrix form, which
described the charge excess evolution, were used to calculate coherent
Cherenkov radio field from electromagnetic cascades. Comparison with results
received in the
... More
Presented by Dr. Igor ZHELEZNYKH
on
9 Jul 2007
at
14:45
We present a new code (named MARCOS) aimed at the realistic simulation of diffusive
shock acceleration in its full time-dependent non-linear developments, and more
specifically at the simulation of multiple (ie successive) shocks acceleration as is
believed to occur in many astrophysical places (most notably in superbubbles).
We present briefly the numerical methods implemented, coupling the h
... More
Presented by Mr. Gilles FERRAND
on
7 Jul 2007
at
09:06
The rapidly varying non-thermal X-ray emission observed from Sgr A* points to
particle acceleration taking place close to the supermassive black hole. The TeV
gamma-ray source HESS J1745-290 is coincident with Sgr A* and may be closely related
to the X-ray emission. Simultaneous X-ray and TeV observations are required to
elucidate the relationship between these two objects. Here we report on j
... More
Presented by Dr. Jim HINTON
on
4 Jul 2007
at
09:06
On June 2, 2006, the Swift Burst Alert Telescope (BAT) triggered a bursting event in
the 15-350 keV energy band which lasted ~9 sec. The burst position was being observed
with the H.E.S.S. array of four Imaging Atmospheric Cherenkov Telescopes (IACTs) at
energies above 100 GeV throughout the duration of the burst, and both before and
after the burst. A total of ~5 hours of observation was obta
... More
Presented by Pak Hin TAM
on
9 Jul 2007
at
12:17
Be-7 is a familiar cosmogenic nuclide in the atmosphere. Since aerosols with
the Be-7 are fallen down from the upper troposphere to the ground, it is
possible to investigate the altitude distribution of the Be-7s from the size
distribution of aerosols attached by the Be-7s. Probably there are the aerosols
of small size in the upper altitude.
Therefore, using an Andersen air sampler, we s
... More
Presented by Mr. Satoshi KIKUCHI
on
7 Jul 2007
at
12:05
We consider the possible use of water and ice
detectors designed for other purposes as detectors
for slow magnetic monopoles. The mechanism we
assume to dominate is monopole catalyzed baryon
decay which can very efficiently turn protons
into electromagnetic energy. Estimates of sensitivity
for existing detectors are given.
Presented by Prof. John SWAIN
on
9 Jul 2007
at
14:45
Major blazar flares likely result from injections of relativistic pair plasma into
the inner jets. Quantifying the jet’s basic physical parameters has been hampered by
the modest sensitivity of past observations, which has allowed only time-averaged
pictures of these rapidly changing phenomena. The capabilities of gamma-ray
observatories have dramatically improved recently with H.E.S.S. and
... More
Presented by Dr. Jennifer CARSON
on
6 Jul 2007
at
12:29
The modeled and observed responses of neutron monitors of two various
types: the standard 3NM-64 and a leadless 4NMD one at the SANAE South
African Antarctic station during a number of large GLE events were compared to
precise the specific yield of the NMD at low rigidity range. The parameters of
primary relativistic solar protons outside magnetosphere: rigidity spectrum,
anisotropy dire
... More
Presented by Dr. Yury BALABIN
on
6 Jul 2007
at
14:45
The twin STEREO spacecraft each include four solar energetic particle (SEP) sensors
(part of the IMPACT investigation) that measure the composition and energy spectra of
SEP ions with 1 ≤ Z ≤ 28 from ~0.05 to ~100 MeV/nuc, as well as electrons. One of
these is the Low Energy Telescope (LET), which measures SEP composition from ~3 to
~30 MeV/nuc. The LET sensors were first powered up in spa
... More
Presented by R A MEWALDT
on
4 Jul 2007
at
12:41
The spectra of low-energy cosmic-ray protons and antiprotons have been measured by
BESS in nine high-latitude balloon flights between 1993 and 2004. These measurements
span a range of solar activity from the previous solar minimum through solar maximum
and the onset of the present solar minimum, as well as a solar magnetic field
reversal from positive to negative in 2000. Because protons and a
... More
Presented by Dr. John W. MITCHELL
on
9 Jul 2007
at
09:30
It has been shown in a series of works that some solar particle events (SPE)
are composed of two different relativistic populations, a Prompt Component
(PC) and a Delayed Component (DC), each one with different energy spectrum
behavior. The source spectra of the DC tend to be an inverse power law at the
steady state situation, whereas the spectra of the PC are considerable
deviated
... More
Presented by Prof. JORGE PEREZ-PERAZA
on
4 Jul 2007
at
13:05
The sun is variable in its magnetic activity with 11-year Schwabe cycle. This
cyclic variation of solar activity modulates the energy spectrum of galactic
cosmic rays entering the heliosphere and therefore the terrestrial radiocarbon
production rate in the atmosphere changes with the same periodicity. Since
the radiocarbon is taken into tree rings after the carbon cycle, the radiocarbon
... More
Presented by Prof. Kimiaki MASUDA
on
9 Jul 2007
at
14:45
PAMELA was launched on June $15^{th}$ 2006 in a pressurized container on board the
Russian Resurs-DK1 satellite. The satellite is flying in high inclination ($70^o$),
low Earth Orbit (350-600 km), allowing measurements in various points and
conditions of the geomagnetosphere. It is a multi-purpose apparatus composed of a
permanent
magnet spectrometer to provide particle charge, rig
... More
Presented by Dr. Marco CASOLINO
on
10 Jul 2007
at
09:30
In this work we report an analysis of various indices of solar magnetic variability
of closed and open field, concentrating particularly in the quasi-biennial
peridicities (1.7-2.5 years). The wavelet technique is used in the time series of
the solar indices to find the significant periodicities of our study, we also use
other wavelet analysis already made. We consider the theory of a doub
... More
Presented by Mr. Luis DE CASO
on
9 Jul 2007
at
14:45
The Sun provides unique opportunities for studying particle acceleration mechanisms
from Earth. Particles may be accelerated to high energies by the first-order Fermi
acceleration, by second-order Fermi acceleration, or by DC acceleration.
Differentiating between these possibilities is a fundamental problem of cosmic ray
physics.
In this talk, a brief summary of past solar neutron events th
... More
Presented by Prof. Yasushi MURAKI
on
4 Jul 2007
at
17:55
Since the December 2004 termination shock transit of Voyager 1, Voyager 2 data have
shown partly analogous, partly dissimilar features to the pre-shock activity seen by
Voyager 1. One important point is the different energy dependence of suprathermal and
mildly energetic omnidirectional particle flux variations for the two data sets.
First harmonic anisotropy amplitudes and phases also displa
... More
Presented by Péter KIRÁLY
on
10 Jul 2007
at
10:54
The lateral distribution funtion (LDF) of charged particles is a basic
characteristics of
extensive air showers (EAS). It is necessary for determination of total number
of particles at observation level and this number is used as an estima of
primary energy.
We consider the experimental LDF's obtained with MSU, Yakutsk and AGASA
arrays. It should be noted that scintillator detectors of
... More
Presented by Mr. Jorge COTZOMI
on
4 Jul 2007
at
14:45
Different locations in the galaxy are unequally participating into the production
of elements and isotopes observed in the solar system. In this work, we
present a model that includes spatial dimensions as a basic element. The
backward stochastic solution introduced in this paper will allow us to determine
the abundance of each nucleus at certain energy and a single location in the
galax
... More
Presented by Dr. Ashraf FARAHAT
on
6 Jul 2007
at
09:06
For the calorimetric determination of the primary energy of extensive air showers,
measured by fluorescence telescopes, a precise knowledge of the conversion factor
(fluorescence yield) between the deposited energy in the atmosphere and the number of
emitted fluorescence photons is essential. The fluorescence yield of the eight
strongest nitrogen emission bands between 300 nm and 400 nm has be
... More
Presented by Dr. Tilo WALDENMAIER
on
6 Jul 2007
at
14:45
A nonlinear kinetic theory of cosmic ray (CR) acceleration in
supernova remnants is employed to calculate CR spectra. The magnetic field
in SNRs is assumed to be significantly amplified by the effectively accelerating
nuclear CR component. It is shown that the calculated CR spectra agree in a
satisfactory way with the existing measurements of the observed Galactic CR
(GCR) spectrum up to
... More
Presented by Prof. Evgeny BEREZHKO
on
5 Jul 2007
at
09:42
Space era for cosmic ray physics began in 1957, when Soviet Union launched the
first satellite in October. The first experiment for cosmic radiation study was
conducted inboard Satellite -2 by prof . Sergey Vernov from Moscow State University.
He installed inboard this satellite the simple Geiger counter to measure fluxes of
cosmic rays above the Earth's atmosphere. Both this experiment and
... More
Presented by Prof. Mikhail PANASYUK
on
5 Jul 2007
at
16:30
The Telescope Array (TA) is a hybrid experiment of an air shower array
and fluorescence telescopes installed in Utah, USA. It aims at
drawing a conclusion on the (non-)existence of the GZK cutoff
reported controversially by the AGASA and HiRes experiments. An
anisotropy of the UHECR arrival directions will be studied in
the northern hemisphere where the galactic disturbances are
small. The u
... More
Presented by Masaki FUKUSHIMA
on
7 Jul 2007
at
12:05
The ARGO-YBJ ground-based detector allows to investigate many issues in
gamma-ray astronomy and cosmic ray physics spanning a large energy range
by means of its ability to operate down to a few hundreds of GeV up to a few
PeV. The apparatus consists of a single layer of about 2000 Resistive Plate
Chambers (RPCs) for a total instrumented area of ~6700 m2. The whole
detector has been fully
... More
Presented by Cristian STANESCU
on
6 Jul 2007
at
14:45
The CANGAROO-III telescope system for very-high-energy gamma-ray astrophysics
consists of four 10-m atmospheric Cherenkov telescopes located near Woomera, South
Australia.
We have been observing southern-sky objects since March 2004.
Here we report on the status of the system and some recent results from CANGAROO-III
observations.
Presented by Dr. Masaki MORI
on
9 Jul 2007
at
08:54
Fully reconstruction works of Super-Kamiokande, a large water cherenkov detector ,
has done in 2006 and data taking has been started from July 06' as SK-III with 11126
20inch PMTs. Calibration works were successfully done and now we are going to step
into analiysis stage. In this talk, I will show the calibration data and some early
data for atmospheric neutrino and solar neutrino from SK-III
... More
Presented by Dr. Makoto MIURA
on
7 Jul 2007
at
12:53
At the previous ICRC, Kruger et al. 2005, Proc. 29th ICRC, Pune, 2, 473, and 2,
477, reported on the first tests of two newly constructed calibration neutron
monitors. These monitors are designed to provide an intercalibration between the 50-
odd neutron monitors around the world, so that rigidity spectra can be calculated
from them. In those papers we described the difference in the latitu
... More
Presented by Prof. Harm MORAAL
on
7 Jul 2007
at
11:18
The uncertainty of hadron interaction models of Monte Carlo simulations have caused
some systematic errors of energy reconstruction and the determination of composition
in ultra high energy cosmic ray measurements. The uncertainty is due to the lack of
the experimental data on the nuclear interactions in the energy region over
2x10^14eV. The LHCf experiment will provide crucial calibration poi
... More
Presented by Mr. Hiroaki MENJO
on
10 Jul 2007
at
09:42
The RICE experiment, located at the South Pole, seeks detection of ultra-high energy
neutrinos based on measurement of the coherent radiofrequency Cherenkov pulse created
by an englacial neutrino-ice collision. Based on the eight-year dataset now
accumulated by RICE, we report on updated results on the neutrino flux in the >100
PeV energy range, limits on neutrino production from gamma-ray bur
... More
Presented by ilya KRAVCHENKO
on
9 Jul 2007
at
12:53
The space TUS detector of UV fluorescence light radiated by EAS of Ultra
High Energy Cosmic Rays (UHECR) is under preparation for the launch in 2009-
2010. The TUS instrument will have ~2 sq. m. mirror - concentrator area and
256 PMT pixels in the photo receiver at the mirror focal surface. The TUS mission
is now planned for operation at the Small Space Apparatus separated from the
main
... More
Presented by Dr. LEONID TKACHEV
on
10 Jul 2007
at
08:54
The 17m diameter MAGIC telescope is currently the largest single dish
Cherenkov telescope for gamma ray astronomy. Within the year 2007 it
will be upgraded with a second telescope MAGIC-II.
Stereo observations will improve the sensitivity of the observatory by a
factor of 2 and help to lower the energy threshold.
The design, status and expected performance of MAGIC-II will be presented.
Presented by Dr. Florian GOEBEL
on
9 Jul 2007
at
08:42
GRAND is an array of position sensitive proportional wire chambers (PWCs) located at
86.2 deg W, 41.7 deg
N at an elevation of 220 m and is adjacent to the campus of the University of Notre
Dame. The geometry of
the PWCs allows the angles of the charged secondary tracks to be measured to +/- 0.3
deg in each of two
orthogonal planes. Muons are 99% differentiated from electron tracks in t
... More
Presented by Prof. John POIRIER
on
9 Jul 2007
at
14:45
We describe a technique used to reconstruct the energy and Xmax of
Ultra High Energy Cosmic Rays (UHECR) observed by the HiRes detector in
stereoscopic mode. This technique calculates the relationship between the
number of shower particles at a given depth of the shower to the signal in
either angular or time bins. This relationship is calculated for a given
shower segment location. The estim
... More
Presented by william HANLON
on
4 Jul 2007
at
14:45
Stochastic acceleleration has been unimportant inside the solar wind termination
shock. This is due to the fact that, its characteristic time is much larger than the
time for particle propagation in this region. However, in the heliosheath, where the
turbulence in the heliospheric magnetic field increases with the radial distance and
the solar wind speed decreases as it moves out, the accelera
... More
Presented by Prof. Harm MORAAL
on
10 Jul 2007
at
13:05
We present a new method to include a wavy heliospheric current sheet into a 2D
numerical model of the heliospheric transport of galactic cosmic rays. Since the wavy
current sheet has essentially 3D structure, we have developed an approach of
averaging the corresponding drift effect over all longitudes for an axisymmetric
model. First, an analytical solution is found for the flat sheet, this mo
... More
Presented by Dr. Ilya USOSKIN
on
9 Jul 2007
at
14:45
Modified Henon–Heiles system describing geodesic in gravitational waves has
already been investigated. There chaotic sense is inferred by the presence of
fractal structure of the boundaries separating the basins of possible escapes.
In this paper, observed chaotic behaviour is characterized by the formalism
appropriating the signature of curvature tensor associated with the space-time
... More
Presented by Dr. Balendra Kr. DEV CHOUDHURY
on
9 Jul 2007
at
14:45
Ground-based composition measurements of high-energy cosmic rays can be significantly
improved by using the direct Cerenkov method. This technique targets the Cerenkov
light produced by the primary particle prior to its production of an extensive air
shower. With the appropriate time and angular resolution, the direct Cerenkov
photons can be separated from those produced in the extensive air
... More
Presented by Ms. Stephanie WISSEL
on
6 Jul 2007
at
12:53
The clustering properties of the arrival directions of ultra high energy cosmic
rays encode important information to determine their origin, composition,
and to constrain galactic and extragalactic magnetic fields. We present here
the results of a variety of analyses of data from the Pierre Auger Observatory
as a function of the angular scale and the energy threshold. We compare our
resu
... More
Presented by Dr. Silvia MOLLERACH
on
4 Jul 2007
at
13:15
It is well accepted today that diffusive acceleration in shocks results
to the cosmic ray spectrum formation. This is particularly true for non-relativistic
shocks
as there is a detailed theory covering a large range of their properties
On the other hand, the properties of relativistic
and highly relativistic shock waves, associated with supersonic plasma flows,
are still under investigat
... More
Presented by Prof. Apostolos MASTICHIADIS
on
4 Jul 2007
at
14:45
EAS hadron number spectrum has been measured at EAS array “Carpet-2” for
hadrons with energy > 50 GeV. The spectrum can be described by a power law
and exhibits a change in the integral spectral index from 1.8 to 3.1 at the
number of hadrons equal to 30. The ratio of the number of muons with
threshold energy 1 GeV to the number of hadrons has also been measured.
Presented by Dr. Dachir DZHAPPUEV
on
4 Jul 2007
at
14:45
The cosmic ray(CR) intensity data record with Goose bay Neutron Monitoring
Station have been investigated on 60 quietest days (QD) in a year for studying
the variation in tri-diurnal anisotropy during solar cycle 21 and 22. It has been
observed that in spite of abrupt change in the amplitude and phase of tri-
diurnal anisotropy in CR intensity, the amplitude is quite significance throu
... More
Presented by Mr. Mahendra RICHHARIA
on
9 Jul 2007
at
14:45
ARGO-YBJ is a full coverage Extensive Air Shower array located by the
high-altitude cosmic rays laboratory of Yangbajing (4300 m a.s.l., Tibet,
China). The detector consists of a layer of Resistive Plate Counters covering an area of
about 5800 m^2 with 58x62 cm^2 unit cells. This design allows a detailed
characterization of cosmic ray showers induced by primaries with energy in the range
fro
... More
Presented by Dr. Giovanni MARSELLA
on
6 Jul 2007
at
09:18
The Tibet air shower array, consisting of 533 scintillation counters
which are placed in a lattice with 7.5 m spacing, has been in
operation since 1999 at Yangbajing in Tibet, China at an altitude of
4,300 m above sea level. We found a modest discrimination between
gamma- and proton-initiated air showers based on air shower profiles
observed by the Tibet air shower array. This method is app
... More
Presented by Dr. Masato TAKITA
on
9 Jul 2007
at
14:45
Very High Energy Gamma Astronomy is one of the scientific aims of the ARGO-YBJ
experiment (YangBaJing, P.R. China), an extensive air shower detector made of a
single layer of Resistive Plate Chambers covering a surface of about 6700 m2. The
exploitation of the full coverage approach (93% of active area) together with the
very high altitude location (4300 m a.s.l.) allows to put the energy thre
... More
Presented by Mrs. Milena DATTOLI
on
9 Jul 2007
at
14:45
The MEMSTEL (Micro Electro Mechanical Systems Space Telescope) is a space
based experiment being designed to investigate the origin of extreme energy
cosmic-ray (EECR) particles above 5 x 10^19 eV. The fluorescent light
generated in extensive air showers (EAS) when EECRs hit the atmosphere can
be detected from low Earth orbit. MEMSTEL will implement a novel idea of a
tracking mirror base
... More
Presented by Dr. Moo Hyun LEE
on
6 Jul 2007
at
14:45
The particle density in extensive air showers fluctuates at the ground level. These
fluctuations, at the scale of the scintillator detector size (several meters), lead
to the diversity of the individual detector responses. Therefore, small scale
fluctuations contribute to the error in the estimation of the primary energy by a
ground array. As a results of analysis of simulated full (unthinned)
... More
Presented by Mr. Grigory RUBTSOV
on
5 Jul 2007
at
10:30
We study features of the 27-day variation of the galactic cosmic ray (GCR) three
dimensional anisotropy calculated by the global spherical analyses method (GSM) using
Fourier harmonic frequency filter, Chree’s diagram and epicyclegrams. We found that
the greater amplitudes of the 27-day variation of the GCR anisotropy in the minima
epoch of solar activity for the A>0 polarity period than for
... More
Presented by Ms. Renata MODZELEWSKA
on
9 Jul 2007
at
14:45
We have studied some characteristics of solar flares and surrounding medium (solar
plasma) by means of 2.223 MeV line time profile of gamma-emission from neutron
captures by hydrogen nuclei. It was composed the code with making allowance for the
main processes of neutron interactions and deceleration in the solar atmosphere,
character of neutron source, losses of neutrons and density model of
... More
Presented by Dr. Leonty MIROSHNICHENKO
on
4 Jul 2007
at
09:06
The blazar Markarian 501 (Mrk 501) was observed at energies above 100 GeV with the
MAGIC Telescope from May through July 2005. The high sensitivity of the instrument enabled
the determination of the flux and spectrum of the source on a night-by-night basis.
Throughout our observational campaign, the flux from Mrk 501 was found to vary by an
order of magnitude, and to be correlated with spe
... More
Presented by Dr. Antonio STAMERRA
on
9 Jul 2007
at
09:18
The Pierre Auger Observatory has been collecting data in a stable
manner since January 2004. We present here a study of the cosmic ray
composition using events recorded in hybrid mode during the first
three years of data taking. These are air showers observed by the
fluorescence detector as well as the surface detector, so the depth
of shower maximum (Xmax) is measured directly. T
... More
Presented by Dr. Michael UNGER
on
4 Jul 2007
at
12:25
The long term modulation of the cosmic ray intensity includes both
Sun and celestial anisotropies. The solar activity is due to high
energy flares producing a decrease (known as Forbush Decrease, FD)
in the cosmic ray intensity, with a time scale of the order of a few
days, often accompained by a Ground Level Enhancement,
due to direct Sun emission during the solar flare.
The celest
... More
Presented by Mrs. Irina JAMES
on
9 Jul 2007
at
14:45
In February 2007 the MAGIC Air Cherenkov Telescope for gamma-ray astronomy was fully
upgraded with a ultra fast 2GSamples/s digitization system. Since the gamma-ray
signals are very short, a fast readout can minimize the influence of the background
from the light of the night sky. Also, the time structure of the event is an
additional parameter to reduce the background from unwanted hadronic s
... More
Presented by Dr. Abelardo MORALEJO
on
9 Jul 2007
at
14:45
The study of time lags between spikes in Gamma-Ray Bursts light curves in different energy bands as a function
of redshift may lead to the detection of effects due to Quantum Gravity. We present an analysis of 15 Gamma-
Ray Bursts with measured redshift, detected by the HETE-2 mission between 2001 and 2006 in order to measure
time lags related to astrophysical effects and search for Quantum G
... More
Presented by Dr. Julien BOLMONT
on
9 Jul 2007
at
14:45
The Tibet air shower array experiment has been conducted at Yangbajing
(90.522°E, 30.102°N; 4300m above sea level) in Tibet, China, Since 1990. A
search for extended emission from Cygnus region was carried out using data
taken from the Tibet III (1999 November -2005 November) arrays. Spreading
across -3° to ~3° in Galactic latitude and 65°to ~85°in Galactic
longitude, an excess tha
... More
Presented by yue WANG
on
4 Jul 2007
at
10:42
Supermassive particles like magnetic monopoles, Q-balls and nuclearites may
emit light at subrelativistic speeds through different suggested mechanisms.
One of them is nucleon decay catalysis by magnetic monopoles, where the
decay products would emit Cherenkov radiation along a monopole track. The
emitted secondary light from subrelativistic particles could make them visible to
the AMAND
... More
Presented by Mr. Arvid POHL
on
5 Jul 2007
at
13:05
The MAGIC collaboration has been performing Target of Opportunity (ToO) observations
whenever alerted that known or potential very high energy gamma-ray emitting
extragalactic sources were in a high flux state in the optical, X-ray band or/and in
the TeV energy range. Here we report on triggered observations, results of the
analysis, and possible optical-TeV correlation seen in the data. Among
... More
Presented by Mr. Daniel MAZIN
on
6 Jul 2007
at
12:41
The solar activity in Cycle 23 gradually changes to final minimum phase. Sun's shadow generated by multi-TeV
cosmic-ray particles has been continuously observed with the Tibet-II and Tibet-III air shower array in 1996
through 2006 during almost whole period of the Solar Cycle 23. We have shown that the Sun’s shadow is strongly
affected by the solar and interplanetary magnetic fields chang
... More
Presented by Dr. MASAKI NISHIZAWA
on
9 Jul 2007
at
14:45
In this work numerical simulations showing the time evolution of a supernova
remnant (SNR) in an uniform and non-uniform intersteller medium (ISM) are
presented. For this we use a hydrodynamic model including a kinematic
calculation of the interstellar magnetic field. Important parameters include the
ejecta mass and energy of the remnant, as well as interstellar medium density
and adiaba
... More
Presented by Dr. Stefan FERREIRA
on
6 Jul 2007
at
14:45
Nearly thirty years ago it was shown that large scale drift plays a significant
role in cosmic ray modulation in the heliosphere. It was found, however, that
the classical values for the drift velocity used in the modulation models lead to
too much drift, and required some reduction. The typical argument for this
reduction of the drift velocity is that when cosmic rays propagate in a tur
... More
Presented by Prof. John BIEBER
on
9 Jul 2007
at
09:06
The wide-band all-sky monitor (WAM) is the secondary function
of large lateral BGO shield of the Hard X-ray Detector (HXD) onboard
the Suzaku mission. Owing to its large geometrical area of 800 cm2 per
side and wide-field of view, the WAM is very suitable to observe gamma-ray
bursts (GRBs) in the energy range of 50--5000 keV. It has actually
observed 183 GRBs confirmed by other satellit
... More
Presented by Dr. Kazutaka YAMAOKA
on
10 Jul 2007
at
09:06
The "fireball model" is often invoked to explain the prompt emission from Gamma-Ray
Bursts (GRBs) as observed in the MeV energy range. In this standard model, the prompt
emission
occurs due to collisions between layers within the relativistic jet. We will present
the expected
synchroton emission from electrons accelerated through the usual Fermi mechanism,
assuming that the
distribution of
... More
Presented by Sylvain GUIRIEC
on
6 Jul 2007
at
13:05
The balloon-borne Cosmic Ray Electron Synchrotron Telescope (CREST)
experiment will measure the flux of cosmic ray electrons at energies greater
than 2 TeV by detecting the x-ray component of the synchrotron radiation
emitted as the electrons traverse the Earth’s magnetic field. This method
enhances the instrument acceptance to several times its geometric area. A
Monte Carlo simulatio
... More
Presented by Scott NUTTER
on
4 Jul 2007
at
14:45
A new study of the cosmic ray electron and synchrotron spectra is presented.
Anomalous diffusion model, proposed in our recent papers, is used to describe the
particles propagation in fractal-like interstellar medium. The parameters defining
the anomalous diffusion have been determined from the analysis of nuclear component.
We carry out calculation of the synchrotron spectrum in the frequency
... More
Presented by Dr. V BUGAYOV
on
4 Jul 2007
at
14:45
The Pierre Auger Observatory employs a wide range of atmospheric monitoring
instruments: two laser facilities; elastic lidar stations; aerosol phase
function monitors; a horizontal attenuation monitor; star monitors;
weather stations; and balloon soundings. Using all available analyzed
atmospheric data we tested the impact on the shower reconstruction, namely
on the shower energy and the posi
... More
Presented by Michael PROUZA
on
4 Jul 2007
at
10:42
CREST is a balloon-borne detector array of barium fluoride
crystal scintillators which will measure the intensity and spectrum of
multi-TeV electrons in the Cosmic Rays. By detecting the synchrotron
photons emitted from electrons passing through the earth's magnetic field,
CREST's acceptance is several times its geometric area. We present
background measurement results from a small arra
... More
Presented by Dr. Michael SCHUBNELL
on
6 Jul 2007
at
10:30
The balloon-borne Cosmic Ray Electron Synchrotron Telescope (CREST)
experiment will employ a novel distributed
electronics system to collect timing and pulse height information from 1024
BaF2 crystal detectors and 42 PMTs in
its anticoincidence shield. The timing of single photoelectron triggers from the
PMTs in the crystal array is recorded
to an accuracy of 1 ns least count. Wide d
... More
Presented by G. TARLE
on
4 Jul 2007
at
14:45
The time profiles and energy spectra of 20.01.2005 (class X7.1), 17.01.2005
(class X3.8) and 15.01.2005 (class X2.6) solar flares from NOAA 00720 active
region in energy band 0.1-20 MeV by AVS-F data are discussed. The energy
spectra of 17.01.2005 and 20.01.2005 solar flares contain nuclear lines,
positron line and neutrons capture line. Only positron line and neutron capture
line in the
... More
Presented by Dr. Leonty MIROSHNICHENKO
on
4 Jul 2007
at
14:45
An algorithm has been derived from simulations above 10**19 eV to amend the conversion
of the densities measured at a given zenith angle to the energy estimators (for
instance,
densities at 600m for AGASA for the corresponding vertical shower). Above 5.10**19
eV, as the
shower vertical maximum depth is close to the experimental plane, a complex
situation happens for the "absorption"; for
... More
Presented by Prof. JEAN-NOEL CAPDEVIELLE
on
4 Jul 2007
at
14:45
Space detectors of UV fluorescence and Cherenkov light radiated by ultra high
energy extensive air showers (UHECR EAS) have advantages of high EAS
detection aperture in observing the whole sky by one instrument and will be
able to get statistically rich results on the UHECR arriving directions.
At the same time the space environment and particularly variable UV
background intensity put so
... More
Presented by Prof. Fumiyoshi KAJINO
on
6 Jul 2007
at
14:45
Comparative analysis of the characteristics of relativistic solar cosmic rays (SCR)
in the two largest GLEs of 23 February 1956 and 20 January 2005 has been
performed. Using a modeling technique, the parameters of relativistic solar
protons (RSP) were obtained from ground-based observations by neutron
monitors (NM) and muon detectors. The two particle populations (components),
prompt (PC
... More
Presented by Prof. Eduard VASHENYUK
on
6 Jul 2007
at
11:18
"Delayed" EAS with N_e>5.10^6 particles are
registered. It were detected 2117 showers with number of particles above 10^7, in 98
from these events "delayed" EAS with N_e>5.10^6 particles were detected. Impulse
delay for the time from 40 up to 600 ns was registered. In 14 events delayed impulses
were registered in 2 and more detectors and in 3 events - in 4 detectors.
Average delay betwe
... More
Presented by Prof. Vladimir YAKOVLEV
on
9 Jul 2007
at
14:45
The MAGIC telescope located on the Roque de los Muchachos on the Canary Island La Palma at a height of
2200m a.s.l. is able to point to the sea. This allows to search for air shower signatures induced by particles
coming out of the Earth. Taking into account the huge effective area, this configuration can be used to
search for tau-neutrinos.
We will show the outcome of simulations for tau
... More
Presented by Dr. Markus GAUG, Dr. Ching-Cheng HSU
on
9 Jul 2007
at
14:45
The past decade has seen enormous progress in the sensitivity TeV gamma-ray
survey instruments. With the ability to continuously observe 2sr of the sky,
survey instruments hold the promise of fully exploring the transient
high-energy universe. After decades of roaming in the desert, survey
instruments are now making detailed measurements of the Galactic diffuse
gamma-ray emission and discov
... More
Presented by Dr. Gus SINNIS
on
10 Jul 2007
at
17:55
Between September 2006 and January 2007 the galactic binary source LS I
+61 303 was observed at TeV energies by the VERITAS array of Cherenkov
imaging telescopes in Southern Arizona. During this time,
contemporaneous observations were taken at X-ray energies by both the
SWIFT and RXTE satellite experiments. Although the X-ray properties of
this source have been well studied in the past,
... More
Presented by Mr. Andy SMITH
on
6 Jul 2007
at
10:42
The gamma-quantum spectra produced by the electronic and hadronic components of
cosmic rays have similar shapes at the energies from 1GeV to 1 TeV due to the
synchrotron losses of the electrons. So, the only observational possibility to
discriminate between leptonic and hadronic contributions is to measure the
gamma-quantum spectrum at energies higher than 1 TeV, where these two spectra are
e
... More
Presented by Vera Yurievna SINITSYNA
on
4 Jul 2007
at
11:42
TeV gamma-rays can result from the photo-de-excitation of PeV cosmic ray nuclei after
their parents have undergone photo-disintegration in an environment of ultraviolet
photons. This process is proposed as a candidate explanation of the recently
discovered HESS source at the edge of Westerlund 2. The UV background
is provided by Lyman-alpha emission within the rich O and B stellar environment.
... More
Presented by Prof. Tom WEILER
on
7 Jul 2007
at
10:42
An overview of TeVCat, a new online interactive catalog for very high energy (VHE; E
> 50 GeV) gamma-ray astronomy is presented. As VHE astronomy continues to grow, the
usefulness of a one-stop clearing house for information on new sources is
increasingly evident. TeVCat is intended to be such a resource. With sky maps, source
information, visibility plotters and linked references, it will hel
... More
Presented by Prof. Scott WAKELY
on
9 Jul 2007
at
14:45
We have developed the technical data acquisition equipment (TEDA) for Green
House Observing Satellite (GOSAT). GOSAT will be launched in middle of 2008
into sun synchronous sub-recurrent orbit with altitude of 666km and inclination
of 98deg, and nominal mission duration is 5years.
TEDA is a comprehensive orbital radiation environment monitor system
designed to provide measurement of th
... More
Presented by Mr. yasutomo SASAKI
on
9 Jul 2007
at
14:45
We have developed detector simulators for the TA fluorescence telescopes (FD)
and the surface particle detector array. In this paper we describe a new
method to evaluate the TA-FD aperture with a Monte-Carlo technique. Since the
field of view and the effective area for the FDs are quite large, a considerable
CPU cost is required for air shower simulations in the full observable region. In
... More
Presented by Dr. Yoshiki TSUNESADA
on
7 Jul 2007
at
12:41
Anomalous cosmic ray spectra, observed by Voyager 1 at the solar wind
terminatiuon shock crossing, were not of the form expected of first
order Fermi (or shock) acceleration, but gave an indication that they
were modulated relative to that form. Further data analysis reveals two
other remarkable features, namely that the energy where the peak ACR
intensity occurs is about four times high
... More
Presented by Dr. Rogelio CABALLERO-LOPEZ
on
10 Jul 2007
at
12:17
The exciting results from H.E.S.S. point to a new population of gamma-ray sources at energies E above 10
TeV,
paving the way for future studies and new discoveries in this energy range. Connected with these
energies is
the origin of particle acceleration to PeV energies and the study of multi-TeV gamma-ray production in a
growing number of astrophysical environments. TenTen is a propose
... More
Presented by Dr. Gavin ROWELL
on
9 Jul 2007
at
11:18
Recent advances in the development of silicon photodetectors working in the Geiger
mode (SiPM), open new perspectives in space-based or balloon-borne calorimetry.
However, present SiPM devices suffer from a number of limitations, including the
instrinsic dynamic range of the photodetector and its operational stability, that
have to be overcome in view of their utilization in ionization calorim
... More
Presented by Prof. Pier Simone MARROCCHESI
on
4 Jul 2007
at
14:45
The Pierre Auger Observatory allows the measurement of both
longitudinal profiles and lateral particle distributions of high
energy showers. The former trace the overall shower development,
mainly of the electromagnetic component close to the core, and the
latter reflect the particle densities in the tail of the shower far
away from the core, and are sensitive to both the muonic and
electrom
... More
Presented by Dr. Ralph ENGEL
on
4 Jul 2007
at
12:35
Several phenomenological models of physics beyond the Standard Model
predict flavor mixing in the neutrino sector in addition to conventional
mass-induced oscillations. In particular, violation of Lorentz invariance,
violation of the equivalence principle, and quantum decoherence can each
result in observable distortions in the high-energy atmospheric neutrino
spectrum. We report on a sear
... More
Presented by Mr. John KELLEY
on
9 Jul 2007
at
14:45
Based on numerical solutions of the focused transport equation we
study the question whether pitch angle diffusion coefficients calculated
from various suggested models for wave-particle interactions and different
assumptions about the nature of magnetic fluctuations in the solar wind can
lead to measurable differences in observables such as the rigidity
dependence of the mean free path and t
... More
Presented by W. DRÖGE
on
5 Jul 2007
at
08:54
Air shower simulation programs are used to reconstruct the energy in the UHECR
surface detectors. This reconstruction is based on the lateral distribution function
obtained in the experiment. It is also known that this function at core distance
greater than 1 km strongly depends on the low energy hadronic models used in the
simulation. There are discrepancies in the particle production
due to
... More
Presented by Dr. Patricia Maria HANSEN
on
5 Jul 2007
at
10:54
The Muon Tracking Detector in the KASCADE-Grande experiment allows
the measurement of muon directions up to 700 m from the shower center.
It means, that nearly all muons produced in a shower and surviving to the
ground level are subject of investigation. It is important not only for
studying mean muon production heights but, even more, for investigations
of EAS muon pseudorapidity distribut
... More
Presented by Dr. Paul DOLL
on
4 Jul 2007
at
14:45
We examine the prompt and afterglow emission
within the context of the Supercritical Pile model for GRBs.
For this we have performed self-consistent calculations
by solving three time-dependent kinetic equations for protons,
electrons and photons in addition to the usual mass
and energy conservation equations. We follow the evolution
of the RBW as it sweeps up circumstellar matter and assume
... More
Presented by Prof. Apostolos MASTICHIADIS
on
6 Jul 2007
at
13:17
The solar periodicities of 80-88 yrs (Gleissberg cycle) and 205 yrs (de Vries cycle or Suess cycle) using different
time series of proxies of cosmogenic isotopes have been reported in a great number of papers.
In this work we present a more objective and general cycle-length determination applying the wavelet
transformation based on the Morlet wavelet to the cosmogenic isotopes. We use the IN
... More
Presented by Dr. Victor Manuel VELASCO HERRERA
on
9 Jul 2007
at
14:45
The AMS detector, to be installed on the International Space Station, includes a Ring
Imaging Cerenkov detector with two different radiators, silica aerogel (n=1.05) and
sodium fluoride (n=1.334). This detector is designed to provide very precise
measurements of velocity and electric charge in a wide range of cosmic nuclei
energies and atomic numbers.
The detector geometry, in particular th
... More
Presented by F. BARAO
on
4 Jul 2007
at
14:45
ANTARES is a large volume, deep-sea, neutrino telescope currently under construction off La Seyne-sur-mer,
France.
Neutrino telescopes aims at detecting neutrinos as a new probe for a sky study at energies greater than 1 TeV.
The detection principle relies on the observation, using photomultipliers, of the Cherenkov light emitted by
charged leptons induced by neutrino interactions in the s
... More
Presented by Dr. Antoine KOUCHNER
on
5 Jul 2007
at
08:29
The ANTARES Collaboration is deploying a large neutrino detector at a depth of 2500 m
in the Mediterranean Sea, 40 km off shore from La Seyne-sur-Mer in South France. The
construction of this 12-line detector with 75 phototubes per line will be completed
by the end of 2007. Data taking has begun since April 2005 with an instrumentation
line also equipped with optical modules. The first 5 detec
... More
Presented by Dr. Stephanie ESCOFFIER
on
5 Jul 2007
at
08:41
The ANTARES collaboration is building an underwater neutrino telescope at
2500 m depth in the Mediterranean Sea. The experiment aims to detect high-
energy cosmic neutrinos using a 3D array of 900 photomultipliers distributed
along 12 lines. 5 such lines have been operational since January 2007. The
PMTs collect the Cherenkov light induced by neutrino-produced charged
particles in the wat
... More
Presented by Dr. Marco CIRCELLA
on
9 Jul 2007
at
14:45
The ANTARES neutrino telescope is being constructed in the Mediterranean Sea.
The complete detector will consist of 12 strings, supplemented by an additional
instrumentation line. Five strings are at present deployed and operating.
Each string is equipped with 75 Optical Modules (OMs) housing the photomultipliers
to detect the Cherenkov light induced by the charged particles produced in
... More
Presented by Mr. Felix FEHR
on
9 Jul 2007
at
14:45
The ANTARES collaboration is building an undersea neutrino telescope at 2400
m depth in the Mediterranean Sea. The experiment aims to detect high-energy
cosmic neutrinos using a 3D array of 900 photomultipliers (PMTs) arranged in
12 strings. The advantages of neutrinos as astrophysical and cosmic
messengers are that they open a new window to observe known astrophysical
objects as well as to l
... More
Presented by Dr. Elisa FALCHINI
on
9 Jul 2007
at
12:29
Absolute calibration of the Pierre Auger Observatory fluorescence detectors
uses a 375 nm light source at the telescope aperture. This end-to-end
technique accounts for the combined effects of all detector components in
a single measurement. The relative response has been measured at
wavelengths of 320, 337, 355, 380 and 405 nm, defining a spectral response
curve which has been normalised to
... More
Presented by Mr. Robert KNAPIK
on
4 Jul 2007
at
14:45
One of the main design goals of the MAGIC telescopes is the very fast repositioning
in case of e.g. GRB alarms, implying a low weight of the reflector dish. This is
accomplished by using a space frame made of carbon fiber epoxy tubes, resulting in a
strong but not very rigid support structure. Therefore it is necessary to readjust
the individual mirror tiles to correct for deformations of the
... More
Presented by A. BILAND
on
9 Jul 2007
at
14:45
The Alpha Magnetic Spectrometer (AMS) is a particle physics detector designed
to measure charged cosmic rays spectra up to TV region, with high energy
photon detection capability up to few hundred GeV. With the large acceptance,
the long duration (3 years) and the state of the art particle identification
techniques, AMS will provide the most sensitive search for the existence of anti
mat
... More
Presented by Prof. Bruna BERTUCCI
on
9 Jul 2007
at
14:45
Ashra (All-sky Survey High Resolution Air-shower detector) is a project
to build an unconventional optical telescope complex that images very
wide field of view, covering 80% of the sky, yet with the angle
pixel resolution of 1.2 arcsin, sensitive to the blue to UV light with the use
of image intensifier and CMOS technology. The project primarily aims to
observe Cherenkov and fluorescence lig
... More
Presented by Prof. Makoto SASAKI
on
9 Jul 2007
at
10:42
The PoGOLite balloon-borne experiment applies well-type phoswich detector
technology to measurements of soft gamma-ray polarization in the 25 - 100
keV energy range. The polarization is determined using Compton scattering
and photoelectric absorption in an array of 217 plastic scintillators. This
sensitive volume is surrounded by a segmented Bismuth Germanium Oxide
(BGO) anticoincidence
... More
Presented by Ms. Cecilia MARINI-BETTOLO
on
4 Jul 2007
at
14:45
We present results on searches for exotic particles
(relativistic magnetic monopoles and WIMPs),
for neutrinos from an SGR Burst and for UHE muons,
obtained with the Baikal telescope NT200 from 1998-2005.
Presented by et al. WISCHNEWSKI, R.
on
9 Jul 2007
at
14:45
After successful recovery of the first CREAM (Cosmic Ray Energetics And Mass)
instrument during the 2004/5 Antarctic campaign, the calorimeter was
refurbished for the third launch, planned for December 2007. In this CREAM-III
calorimeter, the optics were replaced with multi-clad fiber ribbons to enhance
the light signal. New readout electronics boards reduce noise even further than
the
... More
Presented by A. MALININ
on
6 Jul 2007
at
09:30
Atmospheric monitoring is indispensable to calibrate the
reconstruction of extensive air shower that observed by air
fluorescence telescope. The Telescope Array (TA) experiment is using
an air fluorescence technique along with a shower array system to
observe the ultra-high energy cosmic ray. And we adopted two laser
systems measuring the atmospheric transmittance to calibrate the
Fluoresc
... More
Presented by Dr. shigeharu UDO
on
6 Jul 2007
at
14:45
The MAGIC telescope has been designed for the observation of the Cherenkov light
generated in
Extensive Air Showers. However, its 17 m. diameter and optical design makes it
suitable for optical
observations as well. In this contribution, we describe the final set-up and
performance of a system
installed at the center of the MAGIC camera (the central pixel) and based on the use
of a dedicate
... More
Presented by Prof. María Victoria FONSECA
on
9 Jul 2007
at
14:45
A new generation of instruments during solar cycle 23 made it possible to measure
solar energetic particle (SEP) energy spectra for many species over a broad energy
interval (~0.1 to ~100 MeV/nuc). These observations revealed that most large SEP
events have power-law spectra below a few MeV/nuc with rather hard spectral indices,
followed by spectral breaks at higher energies. The spectral brea
... More
Presented by R A MEWALDT
on
4 Jul 2007
at
12:17
The Cosmic Ray Observatory Project (CROP) is a statewide education and research
experiment involving Nebraska high school students, teachers, and university
undergraduates in the study of extensive cosmic-ray air showers. A network of high
school teams construct, install, and operate school-based detectors in coordination
with University of Nebraska physics professors and graduate students. Th
... More
Presented by Prof. Gregory SNOW
on
4 Jul 2007
at
14:45
During December 13 2006 a ground-level enhancement was recorded by the
world-wide network of neutron monitors. This paper discusses the response of
three cosmic ray detectors characterized by different rigidity cutoffs: LARC (King
George Island - Antarctica), SVIRCO (Rome - Italy) and OLC (Santiago of Chile).
*: Research partly supported by the Italian Antarctic Research Program.
Presented by Dr. MARISA STORINI
on
6 Jul 2007
at
14:45
In this paper we are introducing a technique to show the variation of the
22Ne/20Ne ratio at different galactic locations and the dependence of this ratio
on the distribution of massive stars in the galaxy. Most of the previously
developed models focused on explaining the ratio variation between the
galactic and solar 22Ne/20Ne but never pointed out to the possibility of
variation of the
... More
Presented by Dr. Ashraf FARAHAT
on
4 Jul 2007
at
14:45
The propagation of energetic particles in the heliosphere is described by the Parker
transport equation. It includes the physical processes of diffusion, drift,
convection and adiabatic energy changes. For the modulation of the particle's energy
spectra the geometry of the heliospheric magnetic field is important, but it is still
an unsolved
problem.
In this contribution we present model c
... More
Presented by Prof. Adri BURGER
on
9 Jul 2007
at
14:45
The EEE (/Extreme Energy Event/) Project is an experiment for the study of very
high-energy extensive air showers, actually starting in Italy. It is based on the
detection of the shower muon component by means of a network of tracking detectors,
installed in Italian High Schools.
The Project, supported by the Ministero dell’Università e della Ricerca (MIUR),
Istituto Nazionale di Fisica
... More
Presented by C. SBARRA
on
10 Jul 2007
at
13:05
The detection of astrophysical sources of high energy neutrinos is one of the
most interesting quests in modern astrophysics. Unlike gamma and X-ray
observations, the low number of signal events expected in high energy
neutrino telescopes, constrains significantly the discovery probability of the
sources. New algorithms to disentangle clusters of small number events from the
background events
... More
Presented by Mr. Juan Antonio AGUILAR SÁNCHEZ
on
9 Jul 2007
at
14:45
Cosmic ray electrons with energies greater that about 300 GeV are of particular
interest because, due to their high energy losses during interstellar propagation,
there are likely to be only a small number of nearby sources contributing to the
electron energy spectrum above several hundred GeV. It has been suggested that this
may result in observable structure. Further, if the annihilation o
... More
Presented by Prof. T. Gregory GUZIK
on
6 Jul 2007
at
10:42
The energies of the lepton (muon and electron) which is produced by neutrino
interaction and the direction pf the incident neutrino are two fundamental
parameters for high energy neutrino astrophysics.
In the experiment for high energy neutrino astrophysics, all the most of muons
from muon neutrino events which occur inside an effective volume of the
apparatus escape from it without loos
... More
Presented by Prof. Nobusuke TAKAHASHI
on
9 Jul 2007
at
14:45
The fluorescence measurement is the key in observations of ultra high energy cosmic
rays and in determinations of their primary energies in the TA experiment. All the
fluorescence detectors of TA will be in operation from June 2007. In this talk, we
will present the characteristics of the telescopes and the status of the associated
systems including for the atmospheric monitoring and the PMT c
... More
Presented by Dr. Shoichi OGIO
on
7 Jul 2007
at
12:29
On the 15th of June, the PAMELA experiment mounted on the Resurs DK1
satellite, was launched from the Baikonur cosmodrome and since July 2006 it
is collecting data. PAMELA is a satellite-borne apparatus designed to study
charged particles in the cosmic radiation, to investigate the nature of dark
matter, measuring the cosmic-ray antiproton and positron spectra over the
largest energy range ev
... More
Presented by Dr. Mirko BOEZIO
on
4 Jul 2007
at
08:30
The Extreme Universe Space Observatory on JEM/EF (JEM-EUSO) is a space mission to study extremely high-energy
cosmic rays. The JEM-EUSO instrument is a wide-angle refractive telescope in near-ultraviolet wavelength region to
observe time-resolved atmospheric fluorescence images of the extensive air showers from the International Space
Station. The focal surface is a spherical curved surface,
... More
Presented by Dr. Yoshiya KAWASAKI
on
6 Jul 2007
at
14:45
The Front-End Cards of the Pierre Auger Surface Detectors: Test Results and Performance in the Field
The Pierre Auger Observatory, presently under construction in Argentina, is nearing
completion. The instrument is designed to
measure the highest energy cosmic rays with unprecedented resolution and statistics.
Its surface array comprises 1600 water
Cherenkov detectors distributed over an area of 3000 km2. The Cherenkov light of each
tank is detected by three 9-inch
photomultipliers from whi
... More
Presented by Karl-Heinz KAMPERT
on
6 Jul 2007
at
14:45
The Gamma-ray Large Area Space Telescope (GLAST), scheduled for launch in late 2007,
is a satellite based observatory to study the high energy
gamma-ray sky. There are two instruments on GLAST: the Large Area
Telescope (LAT) which provides coverage from 20 MeV to over 300 GeV,
and the GLAST Burst Monitor (GBM) which provides supportive
observations of transients from 8 keV to 30 MeV. GLAST wi
... More
Presented by Dr. Julie MCENERY
on
10 Jul 2007
at
10:42
The analysis of the GLE 13.12.2006 using the data of neutron monitors,
balloons, and modeling computations has been carried out. The event was
connected to the flare and appeared rather unexpected, as it occurred during
the ongoing phase of solar minimum. The characteristics of relativistic solar
protons were derived by modeling technique from the neutron monitors data.
The direct solar
... More
Presented by Mr. Eduard VASHENYUK
on
6 Jul 2007
at
10:54
The exclusive Galactic gamma-ray club rallies new members. Supernova remnants,
pulsar wind nebulae, and binary systems hosting a compact object have recently
joined the young pulsars as firmly established sources of gamma rays in the
Milky Way. The first examples of these gamma-ray emitters had been suspected in
the early eighties with COS-B, many more in the nineties with EGRET, but only
the
... More
Presented by Dr. Isabelle GRENIER
on
6 Jul 2007
at
16:30
The High Energy Stereoscopic System (H.E.S.S.), located in the Khomas
Highlands of Namibia, is an array of four imaging atmospheric-Cherenkov
telescopes designed to detect gamma rays in the very high energy
(VHE; > 100 GeV) domain. Its high sensitivity and large field of view
(5 deg) make it an ideal instrument to perform a survey within the
Galactic plane for new VHE sources. Previous obse
... More
Presented by Mr. Stefan HOPPE
on
7 Jul 2007
at
10:54
The presence of a heliosphere surrounding the Sun was suggested by L. Davis fifty
years ago, when there was limited knowledge of interplanetary and interstellar
conditions. That suggestion was soon followed by Parker’s prediction of a supersonic
solar wind that was observed by Mariner 2, initiating a systematic exploration of the
heliosphere that now extends to high solar latitudes and to d
... More
Presented by Prof. E. C. STONE
on
10 Jul 2007
at
16:30
The spectra and light curve of near a hundred Solar X-ray Flare events, which
were observed by SZ2/XD in the energy band of 10-800 keV during 2001, have
been investigated. The events covered from C to X-class flares, which are
shown different characters of high energy photons emission. The results will be
presented in this paper. The discussions will be made especially for 3 of the
brigh
... More
Presented by Prof. Huanyu WANG
on
4 Jul 2007
at
08:54
We describe the High Energy Telescopes (HETs), which are part of the IMPACT
investigation for the STEREO mission (Principal Investigator: Janet Luhmann,
University of California at Berkeley). The two STEREO spacecraft were launched from
Cape Canaveral, FL on October 25, 2006. High energy electrons (~ 0.7 -6 MeV) and
nuclei from hydrogen to iron (~ 13 – 200 MeV/nucleon) are detected by the
... More
Presented by Tycho VON ROSENVINGE
on
4 Jul 2007
at
12:29
Since the last cosmic ray meeting we have witnessed the commissioning of a suite of
experiments that have the possibility to detect neutrinos from sources beyond the
sun. They will open a window on the Universe spanning from sub-TeV energy to energies
beyond EeV. We anticipate the observation of supernova remnants at the lowest
energies, provided that these are indeed the sources of the galact
... More
Presented by Dr. Francis HALZEN
on
4 Jul 2007
at
17:25
This lecture honors the discoverer of cosmic rays nearly 100 years ago.
Research on cosmic rays spawned the entire field of particle physics which
in the early 50's shifted to accelerators as marked by the famous
conference at Bagneres de Bigorres. Remaining to investigate were all the
astrophysical aspects of cosmic rays which has been the principal subject
of the ICRC meetings ever since. O
... More
Presented by Prof. James W. CRONIN
on
3 Jul 2007
at
18:20
JEM-EUSO is a science mission to explore extremes of the Universe. It
observes the dark-side of the Earth and detects UV photons emitted from
the giant air shower caused by an extremely high energy particle (about
10^20 eV). Such a particle arrives almost straightly through our Milky
Way Galaxy and is expected to allow us to trace the source location by
its arrival direction. This will open
... More
Presented by Dr. Toshikazu EBISUZAKI
on
10 Jul 2007
at
08:42
KASCADE-Grande is an extensive air shower experiment co-located to the original
KASCADE site at Forschungszentrum Karlsruhe, Germany. Main parts of the experiment
are the Grande array consisting of 37x10 sqm scintillation detectors spread over an
area of 700x700 sqm, the original KASCADE array with 252 stations covering 200x200
sqm with unshielded and shielded detectors, and additional muon tr
... More
Presented by Dr. Andreas HAUNGS
on
6 Jul 2007
at
13:06
The LOFAR radio telescope, under construction in the Netherlands, will be a powerful instrument
to measure extensive air showers through their radio signal. In order to fully understand the
properties of these signals, we are building a library of CORSIKA simulations of showers at
10^16--10^20.5 eV on the LOFAR BlueGene supercomputer. This library contains histogrammed
data on the
... More
Presented by Mr. Sven LAFEBRE
on
6 Jul 2007
at
14:45
The 10 Mton-scale high energy neutrino telescope NT200+
is currently in operation in Lake Baikal.
We review results obtained with the predecessor detector NT200,
and present first results from NT200+.
We discuss the envisaged next generation
Lake Baikal Gigaton Volume (km3) detector,
for which R&D activities in the lake have already started.
Presented by et al. WISCHNEWSKI, R.
on
10 Jul 2007
at
13:17
The Mexican Array Radio Telescope (MEXART) consists of a 64x64 (4096) full wavelength
dipole antenna array, operating at 140 MHz, occupying 9,500 square meters (70 m x 140
m) to carry out interplanetary scintillation (IPS) observations. This is a dedicated
radio array for IPS observations located in the state of Michoacan (350 km north-west
from Mexico City, lat. 19$^$ 48' N, long. 101$^$ 41'
... More
Presented by Dr. Gonzalez-Esparza AMERICO
on
4 Jul 2007
at
14:45
The NEMO (NEutrino Mediterranean Observatory) Project aims at the construction of a
km3-scale neutrino telescope in the Mediterranean Sea.
After extensive deep-sea surveys performed in several sites in the Mediterranean, an
optimal installation site for the apparatus has been identified at a depth of 3500 m,
about 80 km off Capo Passero, at the SE corner of Sicily, Italy.
In this talk, we wil
... More
Presented by Prof. MAURO TAIUTI
on
5 Jul 2007
at
10:42
The Pierre Auger Observatory is a multi-national project for research on ultra-high
energy cosmic rays. The Southern Auger Observatory in Mendoza province, Argentina,
is approaching completion in 2007 with an instrumented area of 3,000 square
kilometers. It will accurately measure the spectrum and composition of ultra-high
energy cosmic rays up to and beyond the predicted GZK feature. We ha
... More
Presented by Prof. David NITZ
on
10 Jul 2007
at
11:42
The present status of the PAMELA electromagnetic calorimeter on board the
satellite Resurs-DK1 will be presented. The PAMELA apparatus was put in orbit
on 15 June 2006. The main task of the calorimeter is to select cosmic-ray
antiprotons and positrons in a vast background of electrons and protons
respectively with an high rejection power. Furthermore, the calorimeter is
equipped with a s
... More
Presented by Dr. Emiliano MOCCHIUTTI
on
6 Jul 2007
at
11:18
On 15-th June 2006 from Baikonur cosmodrom the satellite RESURS - DK1 was successfuly
launched. The international team of researchers performs the scientific
investigations of cosmic rays in a wide energy range with the spectrometer PAMELA on
board of this satellite. The neutron detector is a part of the PAMELA spectrometer.
It’s task is to separate the cascades of hadron and lepton origin.
... More
Presented by Prof. Yuri STOZHKOV
on
4 Jul 2007
at
14:45
Thanks to recent progress in Cherenkov detection technique, VHE astrophysics has
stepped out of its infancy and has evolved into a mature branch of astronomy. The
next stage in the evolution of the field should be the construction of a major new
observatory accepting peer-reviewed proposals from the general astronomical
community. As part of the planning exercise for this Cherenkov Telescope
... More
Presented by Prof. Luke DRURY
on
10 Jul 2007
at
11:18
The Space Mission Pamela, launched in orbit on 15 June 2006, represents the
state-of-the-art of the investigation of the cosmic radiation to addressing the
most compelling issues facing astrophysics and cosmology: the nature of the
dark matter that pervades the universe, the apparent absence of cosmological
antimatter, the origin and evolution of matter in the galaxy.
The primary scien
... More
Presented by Prof. Piergiorgio PICOZZA
on
5 Jul 2007
at
08:42
GLAST is a gamma-ray mission which will be launched in November 2007. It is equipped
with the GLAST Burst Monitor (GBM) which detects Gamma-Ray Bursts (GRBs) with high
reliability and provides a position and energy spectrum in the range between 10 keV
and 30 MeV. The Large Area Telescope (LAT) will observe photons with energies from 20
MeV up to more than 300 GeV. With GLAST it will be possibl
... More
Presented by Nukri KOMIN
on
9 Jul 2007
at
13:05
Quasi Elastic Scattering in the dominant mechanism for producing both Fully
Contained Events and Partially Contained Events for the examination of the
neutrino oscillation in the Super-Kasmiokande(SK) detector for the atmospheric
neutrinos in the energy range from several hundreds MeV to several GeV.
In the analysis of these neutrino events, SK collaboration assume that the
direction of t
... More
Presented by Prof. Eiichi KONISHI
on
9 Jul 2007
at
14:45
At the 29th ICRC, Pune, India, a new methodology was presented for investigating the
rigidity dependence of galactic cosmic ray (GCR) modulation on all time scales. The
methodology uses the median rigidity of response (Rm) of cosmic ray detectors
deployed at global sites. We define Rm as the GCR rigidity below which lies 50 % of
the detector counting rate. It is computed from the latitude surv
... More
Presented by Prof. Harjit AHLUWALIA
on
6 Jul 2007
at
09:06
PAMELA is a satellite-borne experiment designed to study the charged component of the
cosmic radiation of galactic, solar and trapped nature. The main scientific objective
is the study of the antimatter component of cosmic rays over a wide range of
energies. PAMELA is mounted on the Resurs DK1 satellite that was launched on June
15th 2006 and is orbiting the Earth on a semipolar (70°) ellipt
... More
Presented by Dr. Silvio ORSI
on
4 Jul 2007
at
14:45
The proposed northern-hemisphere cubic-kilometre under water neutrino detector,
KM3NeT, promises unprecedented sensitivity to potential fluxes of neutrinos from
southern hemisphere gamma-ray counterparts. KM3NeT is briefly outlined before
gamma-ray observations of AGN are used to set upper-limits on the neutrino production
rate in these potential extragalactic cosmic ray engines. Absorption of
... More
Presented by Dr. Richard WHITE
on
9 Jul 2007
at
14:45
If the diffuse extragalactic gamma ray emission traces the large scale
structures of the universe, peculiar anisotropy patterns are expected in the
gamma ray sky. In particular, because of the cutoff distance introduced by the
absorption of 0.1-10 TeV photons on the infrared/optical background,
prominent correlations with the local structures within a range of few hundreds
Mpc should be
... More
Presented by Dr. alessandro CUOCO
on
7 Jul 2007
at
13:17
The intrinsic distribution of spectral indices in GeV energies of gamma-ray–loud
blazars is a critical input in determining the spectral shape of the unresolved
blazar contribution to the diffuse extragalactic gamma-ray background, as well as an
important test of blazar emission theories. We present a maximum-likelihood method of
determining the intrinsic spectral index distribution (ISID) o
... More
Presented by Ms. Tonia VENTERS
on
6 Jul 2007
at
14:45
In distinguishing between the atmospheric Cerenkov light initiated by the primary
cosmic ray and its associated air shower, the Track Imaging Cerenkov Experiment
(TrICE) is devised to measure the composition of cosmic rays at TeV-PeV energies.
The instrument is a fixed-mount zenith telescope that uses a fresnel lens as a early
trigger and 4m focal length spherical mirrors to produce the image
... More
Presented by Ms. Stephanie WISSEL
on
4 Jul 2007
at
14:45
The periodicities of cosmic ray space intensity variation are analyzed using
Lomb-Scargle Fourier transformation method with about 37 billion cosmic ray
events recorded by Tibet III Air Shower Array during the period from November
1999 to November 2005. To eliminate meteorological effect, we adopt East-
West subtraction method. According to our analysis, except the well known
solar diurn
... More
Presented by Dr. aifeng LI
on
9 Jul 2007
at
14:45
GRAPES-3 experiment is situated at Ooty in South India 76.7 East 11.4 North.
Effective observation area of our muon telescopes is 560 m^2. They are the
largest detector in the world of its kind.
There were several reports that increase of the solar wind velocity suppresses
the intensity of cosmic rays. But there are few which studied qualitatively.
We have analyzed the variation of daily me
... More
Presented by T NONAKA
on
9 Jul 2007
at
12:05
We have determined the cosmic ray source abundances of the isotopes of
sulfur, argon, and calcium using data from the Cosmic Ray Isotope
Spectrometer (CRIS) aboard the ACE spacecraft. We compare the source
abundances derived in this work, employing a leaky-box model, with
those calculated using the GALPROP cosmic ray propagation code. Cosmic
rays are thought to originate in the cores of super
... More
Presented by Dr. R.C. OGLIORE
on
4 Jul 2007
at
14:45
The TA Low Energy Extension will include a Tower FluorescenceDetector. Extensive air
showers at the lowest usful energies for fluorescence detectors will in general be
close to the detector. This requires viewing all elevation angles to be able to
reconstruct showers. The TALE Tower Detector, operating in conjunction with other
TALE detectors will view elevation angles up to above 70 degree
... More
Presented by Prof. Douglas BERGMAN
on
6 Jul 2007
at
14:45
A time-of-flight scintillator system (TOF) has been developed for the
PAMELA satellite-borne cosmic ray experiment, mounted on the Resurs DK1
satellite and launched from the Baikonur cosmodrome on June 15th
2006. PAMELA was built to measure charged particles in the cosmic radiation with a
particular focus on antiparticles. The TOF scintillator system provides the fast
trigger to the experimen
... More
Presented by Dr. Wolfgang MENN
on
4 Jul 2007
at
14:45
Accurate measurements of the composition and energy spectra of cosmic rays beyond the
TeV energy region have been an experimental challenge for years. TRACER ("Transition
Radiation Array for Cosmic Energetic Radiation"), is currently the largest cosmic-ray
detector for direct measurements, and has been developed for long-duration balloon
flights. The instrument is unconventional in that it u
... More
Presented by Prof. Dietrich MULLER
on
4 Jul 2007
at
10:30
The BL Lac object (blazar) Mrk 421 was observed in a high emission state in April
2005 with the Whipple 10 m telescope for about 24.5 hrs. The measured gamma-ray rate
varied substantially over the range of 4 to 10 γ’s/min and eventually exceeded the
steady γ-ray rate of the Crab Nebula (the standard candle) by a factor of 3. The
overall significance of the gamma-ray signal reached 50σ and
... More
Presented by Dr. Alexander KONOPELKO
on
6 Jul 2007
at
14:45
With H.E.S.S., a system of four Cherencov telescopes, a signal of very high energy
TeV-$\gamma$-radiation from the direction of the Galactic center has been detected.
The interpretation of the signal due to dark matter annihilations is discussed and
limits on the annihilation cross sections and density profiles are given. This is an
update of earlier publications including recent observations
... More
Presented by Joachim RIPKEN
on
6 Jul 2007
at
14:45
The physics goals of the The Telescope Array Low-Energy Extension (TALE)
include the hybrid measurement of spectrum and composition of cosmic rays down
to energies below 10^17 eV. To achieve composition measurements from
observation of extensive air showers, a ground array detector must have the
ability to distinguish the muonic and electromagnetic components of a shower.
Here, we consid
... More
Presented by Prof. John BELZ
on
6 Jul 2007
at
14:45
The Telescope Array Project (TA) is an Ultra High Energy Cosmic Ray
Observatory in central Utah. It performs a hybrid measurement of the
extensive air showers induced by cosmic rays. The two detector systems
are 1) an array of 576 scintillation detectors and 2) three fluorescence
telescope observatories which overlook the ground array. The Telescope
Array will measure the study spectral sh
... More
Presented by Dr. John Norman MATTHEWS
on
6 Jul 2007
at
14:45
The Southern part of the Pierre Auger Observatory, which is nearing completion, has
been in stable operation since January 2004 whilst it has grown in size. The large
sample of data collected so far has led to a significant improvement to the energy
spectrum of UHE cosmic rays over that previously reported by the Pierre Auger
Observatory, both in with regard to statistics and systematic uncert
... More
Presented by Dr. Yamamoto TOKANATSU
on
4 Jul 2007
at
11:42
The high-energy physics community has been discussing for years the need to
bring together the three principal disciplines that study hadron cross-section
physics - ground-based accelerators, cosmic-ray experiments in space, and air
shower research. Only recently have NASA investigators begun discussing the
use of space-borne cosmic-ray payloads to bridge the gap between accelerator
phys
... More
Presented by Dr. Thomas WILSON
on
9 Jul 2007
at
14:45
The VERITAS array trigger requires a simultaneous coincidence between multiple
telescopes to initiate the readout of data and is essential to reducing the
overwhelming background of local muons whilst efficiently recording light from VHE
gamma ray initiated air showers. The selection of coincident events in hardware
reduces the overall trigger rate allowing the individual telescopes to trigger
... More
Presented by Dr. Richard WHITE
on
9 Jul 2007
at
14:45
VERITAS is an array of Imaging Atmospheric Cherenkov Telescopes designed for
very high energy gamma ray (E>100GeV) observations of astrophysical sources.
The experiment began its scientific observation program in the 2006/2007
observing season. We describe here the analysis chain for reducing the data,
reconstructing the direction and energy of incident gamma-rays and the
rejection of backgro
... More
Presented by Dr. Michael DANIEL
on
9 Jul 2007
at
14:45
The VERITAS gamma-ray observatory, situated in southern Arizona, is an array of four
12-m diameter imaging Cherenkov telescopes, each with a 499-pixel
photomultiplier-tube camera. The instrument is designed to detect astrophysical
gamma rays in excess of 100GeV. At the low end of the VERITAS energy range,
fluctuations in the night sky background light and single muons from cosmic-ray
shower
... More
Presented by Dr. Amanda WEINSTEIN
on
9 Jul 2007
at
14:45
The galactic and solar cosmic radiation in the inner solar system has left indelible
records of their varying intensities over the past millennia in ice cores, tree
rings, and meteoritic material. While this was previously well known, atmospheric,
meteorological, and other factors have hindered the use of these data in quantitative
studies of the cosmic radiation. This is no longer so due to t
... More
Presented by Prof. Kenneth G. MCCRACKEN
on
7 Jul 2007
at
17:25
As part of the normal operation of the Whipple 10m Gamma Ray telescope, ten
minute drift scan “zenith” runs are made each night of observation for use as
calibration. Most of the events recorded during a zenith run are due to the
background of cosmic ray showers. However, it would be possible for a hitherto
unknown source of gamma rays to drift through the field. This paper reports
t
... More
Presented by Dr. Mary KERTZMAN
on
7 Jul 2007
at
11:30
Compared with the analysis of Fully Contained Events and Partially Contained
Events occurring inside the detector in Superkamiokande for the investigation of
the neutrino oscillation, the analysis of the Upward Stopping Muon Events and
Upward Through Going Muon Events occurring the outside detector is much
easier, although the quality of the experimental data is inferior to the former.
We
... More
Presented by Prof. Nobusuke TAKAHASHI
on
9 Jul 2007
at
14:45
A variety of mdoels for the origin of Extragalactic Cosmic Rays have been
examined in an attempt to see whether it is possible to explain the ankle in the
spectrum as a property of the EG particles alone. We find that it is not and see
no reason to doubt that it marks the cross-over point between Galactic and EG
particles.
Presented by Prof. Arnold WOLFENDALE
on
7 Jul 2007
at
09:10
The ARGO-YBJ experiment has now reached its final design configuration. The
detector system consists of a full coverage array ( about 5800 m2) of Resistive
Plate Chambers (RPCs). At the nominal threshold the system must be able to
sustain a maximum transfer rate of the order of 15 MB/s and an high peak data
flow. Data are read out using a typical front-end acquisition chain built around a
... More
Presented by Cristian STANESCU
on
6 Jul 2007
at
14:45
Near UV detector on-board the “Universitetsky-Tatiana” satellite has observed
the atmosphere glow at night side of the Earth. Digital oscilloscopes help to
select transient luminous events and to measure their temporal profiles in time
scale of 1-64 ms. Data from those detectors were analyzed for prediction the
duty cycle of future space detectors of ultra high energy cosmic rays.
Presented by Mr. Pavel KLIMOV
on
10 Jul 2007
at
10:42
The dependence of the muon flux from the atmospheric parameters (pressure and
temperature) is a well known effect since long time ago, that is usually
corrected for in cosmic ray measurements. We have correlated at EAS-TOP (LNGS)
the muon flux detected by the EMD detector (29 stations, 10m^2 each,
E_thr>3MeV) with the atmospheric temperature (10-1000mb levels) monitored by
the radio-soundings
... More
Presented by Dr. Mario BERTAINA
on
6 Jul 2007
at
14:45
The 17m diamter MAGIC telescope is currently the largest single dish Cherenkov
telescope for gamma ray astronomy. Within the year 2007 it will be upgraded with a
second telescope MAGIC-II. The camera of MAGIC-II will include several new features
compared to the MAGIC-I camera. Photomultipliers with the highest available photon
collection efficiency have been selected. A modular design allows e
... More
Presented by Mr. Ching-Cheng HSU
on
9 Jul 2007
at
14:45
The chemical composition of primary cosmic rays in the energy range ~10^15
eV are going to be examined from muon energy spectra using the AIRES
simulation program. The muon energy spectra observed by the compact
extensive air shower array and the solid iron magnet spectrometer are
compared with simulation result.
Presented by Mr. Hiroki MATSUMOTO
on
9 Jul 2007
at
10:42
The IceCube Neutrino Telescope is currently under construction at the geographic
South Pole and will eventually instrument a volume of one cubic kilometer by 2011. It
currently consists of 22 strings with 60 Digital Optical Modules each. Additionally
the AMANDA detector has been fully integrated into IceCube operation. This includes
hardware synchronisation, combined triggering, common event b
... More
Presented by Dr. Andreas GROSS
on
10 Jul 2007
at
12:05
We present an updated all-particle energy spectrum using data set collected in the
period from 2000 November through 2004 October by Tibet-III air-shower array. The
energy determination of the air showers is made by fitting the lateral density
distribution of the shower particles to the modified NKG function which is optimized
by simulation calculation using interaction models of QGSJET01c
... More
Presented by Mr. Ding CHEN
on
6 Jul 2007
at
08:54
The study of the evolution of the cosmic ray anisotropy over primary energy in the range 10^14-10^15 eV
can provide a significant tool for the understanding of the knee in the primary spectrum.
The EAS-TOP result obtained at Eo ~ 10^14 eV has been extended to higher energies in order to approach
the knee region, by exploiting the full data set (about 10 years of data taking).
Results derived
... More
Presented by Prof. - THE EAS-TOP COLLABORATION
on
9 Jul 2007
at
08:30
Diffuse emission from the Milky Way dominates the gamma-ray sky. About 80% of
the high-energy luminosity of the Milky Way comes from processes in the
interstellar medium. The Galactic diffuse emission traces interactions of
energetic particles, primarily protons and electrons, with the interstellar gas
and radiation field, thus delivering information about cosmic-ray spectra in
distant locati
... More
Presented by Dr. Troy PORTER
on
7 Jul 2007
at
11:42
The Fisk-model for the heliospheric magnetic field (HMF) was developed in an
attempt to connect the structure of the magnetic field at large heliocentric
distances to processes in and above the photosphere. A Fisk-Parker hybrid
model that is valid for the whole heliosphere (Burger and Hitge 2004, ApJL,
617) and the whole solar cycle (Kruger 2006, MSc dissertation, NWU University)
was dev
... More
Presented by Prof. Renier BURGER
on
9 Jul 2007
at
09:42
The effects on the galactic cosmic ray modulation of a Parker field modified by a
atitudinal-dependent solar wind speed are numerically investigated. The
calculation of the propagation of the galactic cosmic ray is made by solving a
coupled set of the stochastic differential equations which is equivalent to the
so-called diffusion convection partial differential equation. The stochastic
... More
Presented by Ms. Shoko MIYAKE
on
9 Jul 2007
at
14:45
Experiments with the new generation of neutron detectors --- the boron-containing
scintillators placed inside a standard NM64 type neutron supermonitor --- have shown, that
the peculiar high-multiplicity neutron events with anomalously prolonged temporal
distributions of neutron intensity, which have been observed earlier in a set of neutron
monitor installations, are connected with an
... More
Presented by A.L. SHEPETOV
on
4 Jul 2007
at
14:45
We present a detailed study of the impact
of jet expansion on the emission properties of blazars, in particular
their gamma-ray lightcurves, based on the notion that the radiation is produced in an
emission zone that is travelling down the jet.
Using analytical estimates and numerical studies with a particular model
of particle energization, we conclude that AGN jets must be very well
collim
... More
Presented by Prof. Martin POHL
on
6 Jul 2007
at
14:45
A linear relationship between the observed 26-day recurrent cosmic-ray
intensity variations and the global latitudinal gradient was first reported by
Zhang (1997, ApJ, 488). Burger and Hitge (2004, ApJL, 617) used a three-
dimensional steady-state numerical modulation model and showed that a Fisk-
type (Fisk 1996, JGR, 101) heliospheric magnetic field (HMF) can in principle
explain these o
... More
Presented by Prof. Renier BURGER
on
7 Jul 2007
at
12:41
We use two complementary models, diffusion and explicit particle propagation, to
analyze the end of the Galactic cosmic ray spectrum and its mixing with the
extragalactic cosmic ray flux. The extragalactic cosmic ray flux is estimated by
comparing Fly´s Eye, HiRes and AGASA spectra with Galactic spectrum expectations for
different injection models, populations of Galactic accelerators and mag
... More
Presented by Cinzia DE DONATO
on
4 Jul 2007
at
14:45
The understanding of mechanisms in active galactic nuclei requires the detection of a
large sample of very high energy gamma-ray objects at varying redshifts. The
gamma-astronomical researches are carrying out with SHALON mirror telescope at the
Tien-Shan high-mountain observatory since 1992. The redshifts of SHALON very high
energy gamma-ray sources range from z=0.0183 to z=1.375. The most di
... More
Presented by Prof. Vera Georgievna SINITSYNA
on
9 Jul 2007
at
11:06
We study the Sun as an extended source of gamma-ray
emission, produced by
inverse-Compton scattering of cosmic-ray electrons with the
solar radiation. This
emission contributes to the diffuse gamma-ray background
even at large angular
distances from the Sun. While this emission is expected to
be readily detectable by
the upcoming gamma-ray satellite GLAST, the situation for
available E
... More
Presented by Mrs. Elena ORLANDO
on
4 Jul 2007
at
08:42
Extremely high energy (EHE) cosmic neutrinos (E>10^8GeV) are considered to carry
important information about particle acceleration mechanisms in the universe and the
origin of EHE cosmic-ray. The IceCube experiment is uniquely designed to detect
highly energetic astrophysical neutrino events using Antarctic ice as a natural
Cherenkov radiator to overcome difficulties associated in the search
... More
Presented by Dr. Aya ISHIHARA
on
5 Jul 2007
at
12:02
Using the spacecraft and the stratospheric balloon cosmic ray data for 1973-2007 we
construct the radial profiles of the medium energy GCR intensity for the successive
solar activity minima (A>0 and A<0) and attempt to describe them in the simple
modulation model taking into account the potential difference between the heliosphere
and the infinity. Besides, using the above radial profiles we n
... More
Presented by Dr. Mikhail KRAINEV
on
9 Jul 2007
at
09:18
Gamma-hadron superfamily STRANA with E0 > 10^16 eV and unusual features
was detected by emulsion chamber at the board of stratospheric balloon. In the
center of the family there was found a halo. The halo and the high energy jet
producing it in the chamber are analysed here.
Presented by Dr. Vladislav OSEDLO
on
9 Jul 2007
at
14:45
The question of the origin of ultra-high-energy cosmic rays at relativistic shock
waves is discussed in the light of results of recent Monte Carlo studies of the
first-order Fermi particle acceleration (Niemiec & Ostrowski 2006; Niemiec, Ostrowski
& Pohl 2006). The models of the turbulent magnetic field near the shock considered in
these simulations include realistic features of the perturbed
... More
Presented by Dr. Jacek NIEMIEC
on
5 Jul 2007
at
12:05
Many experimental results around and above the energies where the solar
modulation affects cosmic ion fluxes were quantified, debated and
conceptualized using leaky box models. These models basically exploit the
notion of equilibrium between creation and destruction processes of cosmic
ions in an undifferentiated arbitrary volume representing the Galaxy, ignoring
the galactic magnetic fi
... More
Presented by Dr. Antonio CODINO
on
6 Jul 2007
at
08:54
The muon charge ratio of the lateral muon density distributions in single
Extended Air Showers (EAS) is considered on basis of Monte Carlo simulations,
in view of proposals to measure this observable in coincidence with EAS
observations. Differences of the azimuthal variation of the muon densities of
opposite charges and the azimuthal variation of the muon charge ratio appear
to be ve
... More
Presented by Prof. Octavian SIMA
on
9 Jul 2007
at
14:45
For the newly build extensive air shower array of the Tien-Shan mountain complex ATHLET
is designed the new type of a large-size charged particles detector on the basis of the thin
molded polystyrene scintillator in conjunction with the wavelength shifting fibers. The 10 mm
thick scintillation plates have a 1x1 m^2 sensitive area, a 99% registration efficiency of the
charged particles and
... More
Presented by A.L. SHEPETOV
on
6 Jul 2007
at
14:45
The MAGIC Collaboration is building a clone, MAGIC II, of the current MAGIC
Telescope. MAGIC II will be built at 85 m of distance from MAGIC I, and will also
feature a huge reflecting surface of ~240 m^2 of area. Unlike
the former telescope, the mirrors for the new one are lighter and larger, being
square of 1 m of side and weighting 10÷12 kg. For the
development and production of th
... More
Presented by Dr. Denis BASTIERI
on
9 Jul 2007
at
14:45
We present the results of simulations of the performance of a 1 sq-km array of
imaging atmospheric Cherenkov telescopes (IACTs). To evaluate limitations of
the imaging atmospheric Cherenkov technique the array is simulated under the
assumption of ideal optics, in a manner which is independent of any
particular telescope implementation. The primary characteristics of the
array performance, col
... More
Presented by Stephen FEGAN
on
10 Jul 2007
at
11:30
The LHCf is an early time physics experiment of the CERN Large Hadron Collider. The
LHCf will provide an indispensable data on the energy and transverse momentum spectra
of neutral particles in the very forward region at 1x10^17eV. The LHCf apparatus is
composed of two independent detectors installed +/- 140m and at zero degree collision
angle from the ATLAS interaction point. Each detector ha
... More
Presented by Mr. Hiroaki MENJO
on
6 Jul 2007
at
14:45
The proton-air inelastic cross section at sqrt(s) approximately 2 TeV has been
obtained from the EAS-TOP Extensive Air Shower experiment data.
The absorption length of cosmic ray proton primaries cascades is studied in the
energy range just below the knee of the primary spectrum. Primary energies are
selected through the EAS muon contents while proton originated cascades at maximum
develop
... More
Presented by Dr. Gian Carlo TRINCHERO
on
9 Jul 2007
at
09:18
We estimate to what extent the neutron monitor and stratospheric GCR data can be used
for getting information on the intensity of the GCRs in a so called medium energy
range (100-500 MeV/n), very important for studying the heliosphere and the GCR
modulation there. The hourly data of the neutron monitors Apatity (since 1969) and
Moscow (since 1958) are used as well as the standard set of the qu
... More
Presented by Dr. Mikhail KRAINEV
on
9 Jul 2007
at
14:45
The TeV blazars Mrk 421, Mrk 501, PSK 2155-304 and 1ES1959+650 are among the brightest known blazars,
yet the existing experimental set of data does not allow one to make unambiguous statements about the physical
mechanisms responsible for the electromagnetic emission. The lack of sensitive coverage in the energy range 1
MeV to 500 GeV (up to 2004), and the scarce truly simultaneous data res
... More
Presented by Dr. David PANEQUE
on
6 Jul 2007
at
14:45
Ultra High Energy Cosmic Rays and Neutrinos, with energies from a few 10^18 eV to
beyond the decade of 10^20 eV, and Cosmic Rays with E >= 5 10^19 eV appear to be the
only suitable messengers to explore the Universe at frontier energies, where
radiation is expected to be produced under the most extreme physical conditions.
Observations of these UHE particles will certainly provide new informa
... More
Presented by Dr. Andrea SANTANGELO
on
10 Jul 2007
at
11:30
The Pierre Auger Observatory is sensitive to ultra-high energy
neutrinos in the EeV range
and above. In this work we discuss in detail the complete chain
allowing
its acceptance to them to be computed. The probability that an
ultra-high energy neutrino produces an Extended Air Shower is first
computed. Then the simulations to get the detector response to those
showers are presented. Finally
... More
Presented by Dr. Jaime ALVAREZ-MUNIZ
on
4 Jul 2007
at
14:45
The Grande array as main part of the KASCADE-Grande experiment consists of 37x10 sqm
scintillation detectors spread over an area of 700x700 sqm. Grande enables triggers
and reconstruction of primary cosmic rays in the energy range of ~30 PeV to 1 EeV.
This contribution discusses the reconstruction of the shower size spectrum, i.e. the
total number of charged particles. The KASCADE-Grande set-
... More
Presented by Dr. Federico DI PIERRO
on
6 Jul 2007
at
12:30
A new gamma ray observatory comprising a large area imaging Cherenkov telescope and
an array of wavefront sampling telescopes is being set up at a high altitude
astronomical site, Hanle (32.8 deg N, 78.9 deg E, 4200 m asl) , in the Ladakh region of
the Himalayas to detect celestial gamma rays. The high altitude and low night sky
background of the site palys an important role in lowering the en
... More
Presented by Prof. Bannanje Sripathi ACHARYA
on
9 Jul 2007
at
10:30
The study of the energy dependence of the depth of shower maximum
and of the muon content in high energy cosmic ray showers are two widely
used methods for the derivation of cosmic ray composition. An alternative
interpretation of the energy dependence of these two observables is
a change in the features of hadronic interactions at high energy.
In this contribution we show that the string per
... More
Presented by Dr. Jaime ALVAREZ-MUNIZ
on
9 Jul 2007
at
12:05
The shapes of cosmic ray trajectories in the Galaxy result from the effect of the
chaotic and regular magnetic field, the rates of the nuclear collisions, the gas
density and other minor parameters. For a given magnetic field configuration
the forms of the trajectories, regardless their lengths, naturally subdivide in
rectilinear and highly tortuous, depending on the ion energy. It is show
... More
Presented by Dr. Antonio CODINO
on
7 Jul 2007
at
09:46
The trigger system of JEM-EUSO should face
different major challenging points: a) cope with the limited down-link
transmission rate from the ISS to Earth, by operating a severe on-board
and on-time data reduction; b) use very fast, low power consuming and radiation
hard electronics; c) have a high signal-over-noise performance and flexibility
in order to lower as much as possible the energy t
... More
Presented by Dr. Mario BERTAINA
on
6 Jul 2007
at
14:45
Gamma-ray bursts (GRB) sign energetic explosions in the Universe, occurring at
cosmological distances. Multi-wavelength observations of GRB allow to study their
properties and to use them as cosmological tools.
In 2011 the space borne gamma-ray telescope ECLAIRs is expected to provide accurate
GRB localizations on the sky in near real-time, necessary for ground-based follow-up
observations.
... More
Presented by Dr. Stéphane SCHANNE
on
6 Jul 2007
at
14:45
The energy spectrum of ultra-high energy cosmic rays (UHECR) is
usually calculated for sources with identical properties. Assuming
that all sources can accelerate UHECR protons to the same extremely
high maximal energy E_max > 10^{20} eV and have the steeply falling
injection spectrum 1/E^{2.7}, one can reproduce the measured cosmic
ray flux above E > 10^{18} eV. We show that relaxing th
... More
Presented by Dr. Dmitri SEMIKOZ, Prof. Michael KACHELRIESS
on
4 Jul 2007
at
14:45
By the neutron monitor placed in the underground room of Tien-Shan mountain station is
measured the spectrum of neutron multiplicities of the registered events. The
spectrum has an approximately power shape with the differential slope index 3.7, its
absolute
intensity being 350-450 times lower than that of the events in the on-ground NM64
type neutron
supermonitor. According to the late
... More
Presented by A.L. SHEPETOV
on
4 Jul 2007
at
14:45
Be-7 is produced by interaction between cosmic rays and nitrogen or oxygen in
the atmosphere. The variation of its concentration indicates the variation of
cosmic-rays intensity. Cosmic rays which reach the earth are modulated by the
solar activities in the heliosphere. It is important to investigate the relationship
between the concentrations of Be-7 and the solar activities, because of t
... More
Presented by Mr. Satoshi KIKUCHI
on
7 Jul 2007
at
09:30
This paper examines the properties of the ~2300-year periodicity in the galactic
cosmic radiation, previously recognized in power spectra of cosmogenic 10Be
and 14C. It shows that the periodicity consists of short episodes (50-100 year)
of high cosmic ray intensity, such as accompanied the Spoerer and Maunder
Minima, separated by long intervals (>1000years) of low intensities similar to,
... More
Presented by Dr. Ken MCCRACKEN
on
9 Jul 2007
at
13:05
We evaluate the muon and tau energy loss produced by photonuclear interactions at
high energies by using different theoretical models. The theoretical uncertainty is
estimated by taking different extrapolations of the DIS structure functions in the low and
moderate $Q^2$ range at extremely low values of $x$ where nuclear shadowing
could be stronger than usually thought.
Photonuclear inte
... More
Presented by Gonzalo PARENTE
on
9 Jul 2007
at
14:45
A nonlinear kinetic theory of cosmic ray (CR) acceleration in
supernova remnants (SNRs) is employed to investigate the properties of SNR
RX J1713.7-3946. Observations of the nonthermal radio and X-ray emission
spectra as well as the H.E.S.S. measurements of the very high energy gamma-ray
emission are used to constrain the astronomical and the particle
acceleration par
... More
Presented by Prof. Heinrich J. VOELK
on
7 Jul 2007
at
09:30
We present some recent developments in the theory of particle acceleration at shock
fronts in the presence of dynamical reaction of the accelerated particles and
self-generation of magnetic field due to streaming instability. The spectra of
accelerated particles, the velocity, magnetic field and temperature profiles can be
calculated in this approach anywhere in the precursor and in the downst
... More
Presented by Dr. Pasquale BLASI
on
5 Jul 2007
at
12:41
It is shown that recording of thermal neutrons accompanying the EAS with
specific scintillator detectors for thermal neutron detection
gives a new and very interesting additional information.
Results of CORSIKA based Monte Carlo simulations as well as preliminary
experimental data are presented. A new method to study Extensive Air
Showers is proposed.
Presented by Dr. Yuri STENKIN
on
6 Jul 2007
at
14:45
The hard X-ray (>150 keV, ACS SPI) emission during the X-class solar flares of
2006
December 5 and 6 lasted about 5 and 15 min respectively and the time profiles
show
several distinct peaks of about 1-2 min. If the time-profiles are plotted relatively
the onset of 15.4 GHz radio emission, then the hard X-ray emission of the
December 6
event would be delayed by 4 minutes in comparison wit
... More
Presented by Dr. Alexei STRUMINSKY
on
4 Jul 2007
at
08:30
Obseravations of neaby blazar PKS 2155-304(z=0.116) was performed
in July and August 2006 with the CANGAROO-III atmospheric Cherenkov
telescope in South Australia, which was triggered by the H.E.S.S.
group as a high state. Stereo observations with three telescopes
were performed except for the observations done before culmination
in each night of July periods due to mechanical tracking proble
... More
Presented by Prof. Kyoshi NISHIJIMA
on
6 Jul 2007
at
14:45
IBEX-lo on the Interstellar Boundary Explorer (IBEX) will image energetic neutral H atoms (ENA) from the
termination shock at 10 – 2000 eV and the flow distribution of interstellar O in spring and fall. The sensor
combines a mechanical collimator to restrict the detectable arrival directions, an atom to negative ion conversion
surface, an electrostatic analyzer, post-acceleration up to 20
... More
Presented by Prof. Eberhard MOEBIUS
on
10 Jul 2007
at
11:42
This paper describes the timing calibration system for the NEMO (NEutrino
Mediterranean Observatory) underwater neutrino telescope. Timing calibration
is a critical task to perform in such a large apparatus, as the track
reconstruction capabilities strongly depend on the accuracy of the time
alignment of the measurements made by the different sensors. A system based
on an optical fibre n
... More
Presented by Dr. Marco CIRCELLA
on
9 Jul 2007
at
14:45
KASCADE-Grande is a multi detector setup for the investigation of extensive air
showers in the primary energy range of the knee including energies around the
so-called second knee. With the data of the 700 x 700 sqm large Grande array shower
core position, shower direction, and the total number of electrons are reconstructed
for events with primary energy above 50 PeV.
Among others, the Grand
... More
Presented by Dr. Vitor DE SOUZA
on
6 Jul 2007
at
12:54
Despite the radical change of origin, the transition from galactic
to extragalactic cosmic rays (CR) is not well established and not
well understood. In principle three important characteristics of CR,
spectrum, chemical composition and anisotropy, must change at
energy of transition. The spectrum is naturally changing from steep
to flat component. The end of galactic CR is characterised
... More
Presented by Dr. Veniamin BEREZINSKY
on
9 Jul 2007
at
16:30
The transport and acceleration of a few-MeV anomalous cosmic rays in the
heliosheath is studied. We show that the compression of the solar wind (due to
charge exchange) result in adiabatic acceleration of these particles.
Furthermore, anomalous cosmic rays also experience acceleration of a
stochastic nature in the inner heliosheath. Comparing numerical model results
with Voyager 1 cosmic
... More
Presented by Dr. Stefan FERREIRA
on
10 Jul 2007
at
12:53
The assumption that the first arriving particles in impulsive
solar energetic particle (SEP) events travel scatter-free along
regular Parker-spiral magnetic field lines from injection
at the Sun to detection at 1 AU has led to the conclusion that
impulsive SEPs are often injected well after a type III
radio burst is observed at the Sun. If all the turbulent scales are taken into
accou
... More
Presented by Stephen KAHLER
on
4 Jul 2007
at
14:45
In the framework of LOPES (LOFAR PrototypE Station), a Self-Triggered Array of Radio
detectors (STAR) is developed. The challenge of LOPES^STAR is to provide an
independent self-trigger on radio emission of extensive air showers with primary
energy above approximate 5*10^17 eV.
Measurements are done both with an external and self-trigger in radio loud and quiet
areas. Based on these data the
... More
Presented by Mr. Thomas ASCH
on
10 Jul 2007
at
12:05
Using all stations of LOFAR we are planning to explore the possibility of using
Moon as a detector of ultra high energy (>10 21 eV) cosmic rays. The idea is to
cover the whole visible lunar surface and to look for short pulses of Cherenkov
radiation emitted by showers induced just below the surface of the Moon when
the cosmic rays strike it.
In the LOFAR station, a large number of digi
... More
Presented by Dr. Kalpana SINGH
on
4 Jul 2007
at
14:45
The new EAS Cherenkov array Tunka-133 of a sensitive area about 1 km^2 is mounting in
Tunka valley since the end of 2005. The new array will permit a detailed study of cosmic ray
energy spectrum and mass composition in the energy range 10^15 - 10^18 eV with the
unique method. The array will consist of 19 clasters each containing 7 optical detectors. The
first claster started operation sinc
... More
Presented by Prof. Vasily PROSIN
on
6 Jul 2007
at
14:45
The previous paper showed that particles in the 20 January 2005 GLE were
probably accelerated in two distinct regions. X- and gamma-ray observations
of the RHESSI spacecraft identify these regions as a loop-like, bipolar
structure in the lower corona which accelerates the particles on a short,
ephemeral time scale to several GeV in energy, and the shock around the CME
emanating from the paren
... More
Presented by Dr. Ken MCCRACKEN
on
6 Jul 2007
at
12:41
In the last two years, the MAGIC telescope has performed an observational campaign on
the X-ray binary LS I +61 303. Observations during the first year covered 6 orbital
cycles and resulted in the first detection of the source above ~200 GeV. LS I +61 303
was also found to be variable. The second campaign spanned 4 more orbital cycles,
covering orbital phases which had not been explored befor
... More
Presented by Ms. Nuria SIDRO MARTIN
on
6 Jul 2007
at
10:30
Ground level enhancements due to solar flare protons have been recorded at
Sanae since 1971 by two neutron monitors with different sensitivities to primary
protons in the rigidity range < 1 GV to ~5 GV. Spectral indexes can be
determined from the enhancement ratios of the two detectors if their specific
yield functions (SYF) are known. The SYF obtained from latitude surveys and
primary c
... More
Presented by Dr. Pieter STOKER
on
6 Jul 2007
at
10:30
The two-dimensional solar diurnal variation of the galactic cosmic-ray intensity
is measured in TeV energy range using data taken from Tibet III air shower
array (Nov.1999-Nov.2005). The variation are consistent with the Compton-
Getting anisotropy due to the terrestrial orbital motion around the sun in the
high energy (12TeV) data sample;while an additional variation is observed in
the l
... More
Presented by Dr. Yi ZHANG
on
9 Jul 2007
at
14:45
The Lunar Cherenkov technique, which aims to detect the coherent Cherenkov
radiation
produced when UHE particles interact in the lunar regolith, was first attempted
with
the Parkes radio-telescope in 1995, though the theory was not sufficiently
developed
at this time to calculate a limit on the UHE neutrino flux from the non-
observation.
Since then, the technique has evolved to includ
... More
Presented by Mr. Clancy JAMES
on
10 Jul 2007
at
13:05
The search for rare massive particles in the cosmic radiation remains one of the main aim of non-accelerator particle
astrophysics. Experiments at high altitude allow lower mass thresholds with respect to detectors at sea level or
underground. We present here the analysis of the full SLIM detector (400 m^2) after 4y exposure at the
Chacaltaya site (5300m a.s.l.). A part is devoted to the stu
... More
Presented by Dr. stefano CECCHINI
on
5 Jul 2007
at
12:29
We will discuss the main theoretical and phenomenological consequences
of the diffusion equation solution for Ultra High Energy Cosmic Rays
in an expanding Universe. The comparison of the two solution in the
case of static and expanding Universe will be also discussed.
Presented by Dr. Roberto ALOISIO
on
7 Jul 2007
at
09:30
The principle of the CODALEMA experiment is based on an original approach for the
detection of radio transients associated with extensive air showers induced by ultra
high energy cosmic rays. Since September 2006, CODALEMA is under operation with a new
setup (technically described in another contribution to this conference) at the
Nancay Radio Observatory in France. It uses 16 broadband dipole
... More
Presented by Dr. Olivier RAVEL
on
7 Jul 2007
at
08:30
Large-scale accretion shocks around massive clusters of galaxies, generically
expected in hierarchical scenarios of cosmological structure formation, are shown to
be plausible sources of the observed ultrahigh energy cosmic rays (UHECRs) by
accelerating a mixture of heavy nuclei including the iron group elements. Current
observations can be explained if the source composition at injection for
... More
Presented by Dr. Susumu INOUE
on
7 Jul 2007
at
08:54
The annihilation of relic Dark Matter(DM) in the galactic halo leads to a
new primary source of gamma rays, positrons and antiprotons, which may
be observed as an excess on top of the cosmic rays (CR) background
calculated within a galactic model. With assumptions of isotropic propagation
and smooth gas distribution the uncertainties in the prediction of local CR
fluxes do not exceed 20%
... More
Presented by Dr. Valery ZHUKOV
on
10 Jul 2007
at
08:42
Starting from a survey of experimental measurements, we assign uncertainties to the
two most critical inputs to the calculation of fluxes of unoscillated atmospheric
neutrinos, the hadron production and the primary cosmic ray fluxes. We then
propagate these uncertainties through the entire flux calculation to arrive at
estimates of the uncertainties in the fluxes of neutrinos and of various r
... More
Presented by Dr. Giles BARR
on
10 Jul 2007
at
12:53
The report describes a 4-channel digital device which can be regarded as a
prototype elementary unit for future underwater acoustic neutrino telescopes.
Signals from the hydrophones, arranged in a pyramid-like geometry with 144 cm
spacing between the hydrophones, are amplified and processed by a 16-bit
ADC card with a frequency up to 200 kHz. There are three regimes of operation
of the i
... More
Presented by Dr. Ralf WISCHNEWSKI
on
9 Jul 2007
at
14:45
In mid December 2006 several flares on the Sun occurred in rapid succession,
spawning several CMEs and bathing the Earth in multiple solar energetic
particle (SEP) events. One such SEP occurring on December 15th was observed
at the Earth just as an interplanetary CME (ICME) from a previous flare on
December 13th was transiting the Earth. Although solar wind observations
during this time
... More
Presented by Tamitha MULLIGAN
on
5 Jul 2007
at
09:18
Inclined air showers are a particularly interesting target for observation
with the radio technique. They are expected to be well detectable and allow
analyses of angular correlations over a much broader range in geomagnetic
angle than near-vertical events. We present an updated analysis of highly
inclined (>50° zenith angle), high energy (>10^5 N_mu) air showers measured
with KASCADE-G
... More
Presented by Dr. Tim HUEGE
on
4 Jul 2007
at
14:45
In February 2007 the MAGIC Air Cherenkov Telescope for gamma ray
astronomy was fully upgraded with a ultra fast 2GSamples/s digitization system.
Since the gamma ray signals are very short, a fast readout can
minimize the influence of the background from the light of the night sky.
Fast flash analog to digital converters (FADCs) are commercially
available, but they are prohibitively expensiv
... More
Presented by Dr. Florian GOEBEL
on
9 Jul 2007
at
14:45
A sample of selected active galactic nuclei (AGN) was observed
from 2005 to 2007 with the High Energy Stereoscopic System (H.E.S.S.),
an array of imaging atmospheric-Cherenkov telescopes in Namibia.
Significant detections for some of these objects are reported
elsewhere. Integral flux upper limits for the other candidate
very-high-energy (VHE; >100 GeV) gamma-ray emitters will be presen
... More
Presented by Dr. Wystan BENBOW
on
6 Jul 2007
at
14:45
The Yangbajing neutron monitor is suitable for observing solar neutrons in
association with solar flares due to a location with an altitude of 4,300 m above sea
level.
Using data of the Yangbajing neutron monitor obtained during 1998 and 2001,
we searched for solar neutrons from individual solar flares detected by BATSE and
Yohkoh. No signal due to solar neutrons was found in coincidence wi
... More
Presented by Dr. HARUFUMI TSUCHIYA
on
4 Jul 2007
at
14:45
The twin observatories of the STEREO mission, launched on October 25, 2006,
will perform comprehensive studies of Coronal Mass Ejections (CMEs) directed
towards Earth from two vantage points which allow stereoscopic remote observations of
CMEs and multi-point in-situ measurements of their interplanetary counterparts
(ICMEs). The Solar Electron and Proton Telescope (SEPT), part of the IMPACT
i
... More
Presented by Mr. Reinhold MÜLLER-MELLIN
on
4 Jul 2007
at
14:45
The issue of the Dark Matter distribution inside the halos is a
very complicated one.
N-body simulations data, which are usually assumed to represent the dark
matter shape inside the halos, suffer from the bug of flattening the model
to all types of Galaxy, without taking into account the peculiar properties
of each Galaxy.
In this work we extract informations on the Dark Matter distribution
... More
Presented by Dr. Lidia PIERI
on
9 Jul 2007
at
14:45
Using the data taken by the ARGO-YBJ experiment (606 $g/cm^{2}$, Tibet, P.R.China)
in the period of July to September 2006, the first measurement of
EAS size spectrum in the range of $N_{e}=5\times10^{4}-5\times10^{6}$
is presented at different zenith angles. The attenuation and absorption
lengths have been determined by applying different analysis methods.
Furthermore the proton-air inelasti
... More
Presented by Dr. Min ZHA
on
6 Jul 2007
at
09:42
Variations of cosmic ray (CR) rigidity spectrum during Forbush effect on 17
January and solar proton event on 20 January, 2005 (the beginning at 06:36
UT, solar coordinates N14W61) have been researched using the method of
spectrographic global survey according to ground-based observations of cosmic
ray intensity at the world-wide network of stations. In integrally analyzing
ground-based
... More
Presented by Dr. Olga KRYAKUNOVA
on
4 Jul 2007
at
14:45
VERITAS, the Very Energetic Radiation Imaging Telescope Array System, is an array of four 12 m diameter imaging
atmospheric Cherenkov telescopes for gamma-ray astronomy above 100 GeV currently in operation in Arizona. The
VERITAS Collaboration has developed VEGAS, the VERITAS Gamma-ray Analysis Suite, a data-analysis software
package for the processing of single- and multiple-telescope data
... More
Presented by Dr. Peter COGAN
on
9 Jul 2007
at
14:45
VERITAS employs a multi-stage data acquisition chain that extends from the VME
readout of custom 500 MHz flash ADC electronics to the construction of telescope
events and ultimately the compilation of information from each telescope into array
level data. These systems provide access to the programming of the channel level
triggers and the FADCs. They also ensure the proper synchronization of
... More
Presented by Elizabeth HAYS
on
9 Jul 2007
at
14:45
Recent all-sky surveys by the Tibet AS and the MILAGRO Observatories have
identified several new potential TeV Gamma-Ray sources.One of these sources
(MGRO J2019+37) is positionally coincident with a Pulsar Wind Nebula
G75.1+0.1, ,and the second source (MGRO J1909+06) is nearby the Supernova
Remnant G40.5-0.5. MGRO J2019+37 was observed by the VERITAS
Observatory during November 2006, a
... More
Presented by Prof. David KIEDA
on
4 Jul 2007
at
09:42
VERITAS is an atmospheric Cherenkov telescope array designed
to study astrophysical sources of very high energy gamma radiation.
Located in southern Arizona, USA, the array consists of four
12-m diameter imaging Cherenkov telescopes. All four telescopes
have been deployed at the basecamp of the Whipple Observatory
and they became fully operational in early 2007. This paper
describes the
... More
Presented by Dr. Gernot MAIER
on
9 Jul 2007
at
08:30
Starburst galaxies are characterized by extremely high star-formation rates and, as a
consequence, very high supernova rates. These rates, as well as the gas density, are
orders of magnitude higher than in our Galaxy. Such an environment contains both a
high cosmic ray flux and high density of target material for pp and inverse compton
interactions. These objects are therefore viable candidate
... More
Presented by Mr. Dalibor NEDBAL
on
6 Jul 2007
at
14:45
Observations of pulsars and pulsar wind nebulae
have been conducted during the last two years using the
MAGIC Imaging Cerenkov Telescope. In addition to the study
of the nebula emission, the low energy threshold of MAGIC
offers the opportunity to search for the pulsed emission
with very high sensitivity.
The selection of the objects was based on their spin-down luminosity
and the probabi
... More
Presented by Ms. Raquel DE LOS REYES, Ms. Ester ALIU
on
4 Jul 2007
at
12:53
C-14 concentrations of single-yr tree rings indicate solar modulations of cosmic
rays such as 11-yr solar cycle. Old tree rings are a powerful tool to detect the
variations of cosmic-rays in past time. From C-14 dating, the calendar age of
the Choukai Jindai cedar in Japan (39°N) was ranged in from 2757 to 2437 cal
BP with 320 tree rings. According to IntCal04 which is the standard
inte
... More
Presented by Ms. Yui TAKAHASHI
on
7 Jul 2007
at
10:54
Sunspot numbers, which reflect solar activity, have presented clear 11-year
periodicity since the early 18th century. However in the period around 1645 to
1715 AD sunspots were almost absent, and this period is called the Maunder
Minimum, one of grand solar minima implying weak solar activity. Variation of
solar activity in grand solar minima can be investigated by determining the
concen
... More
Presented by Mr. Kentaro NAGAYA
on
9 Jul 2007
at
12:53
The vertical profile of air density at a given site varies considerably with time.
Well understood seasonal differences are present, but sizeable effects on shorter
time scales, like day to night or day to day variations, are also observed. In
consequence, the Moliere radius changes, influencing the lateral distribution of
particles in the air showers and therefore may influence the shower de
... More
Presented by Dr. Barbara WILCZYNSKA
on
4 Jul 2007
at
14:45
The variations of anisotropy of primary spectrum of cosmic rays (CR) during the
period of CR intensity increasing on January 20, 2005, have been obtained
using the method of spectrographic global survey according to the data of
ground-based observations of CR at the world-wide network of stations. It is
shown that in the flare main phase, there was observed a CR strong
anisotropy and the
... More
Presented by Dr. Sergey STARODUBTSEV
on
6 Jul 2007
at
14:45
With a volume of ~1 km3, IceCube will be able to detect very high energy
neutrinos above ~1E17 eV. At these energies, bremsstrahlung and pair
production are suppressed by the Landau-Pomeranchuk-Migdal effect (LPM).
Therefore, nu_e and nu_tau interactions in the ice can produce several hundred
meter long showers. We present an analysis of IceCube sensitivity to such events. It includes
simulat
... More
Presented by Dr. Julien BOLMONT
on
9 Jul 2007
at
14:45
Exploration of the galactic and metagalactic objects in which the acceleration of
protons and nuclei is accompanying with generation of gamma-quanta and neutrinos is
of great current interest for astroparticle physics because the gammas and neutrinos
do not dissipate energy after propagation through the magnetic fields of the Universe
providing a unique probe into these cosmic accelerators. Th
... More
Presented by Prof. Vera Georgievna SINITSYNA
on
6 Jul 2007
at
14:45
The Virtual Cosmic Ray Observatory (ViCRO) is proposed to extend planned capabilities
of NASA’s existing or developing heliophysics virtual observatories with a collection
of important cosmic ray datasets with an initial focus on interplanetary solar and
heliospheric science applications. Recent work from the Advanced Composition Explorer
(ACE) and Voyager spacecraft shows the science value
... More
Presented by Dr. John COOPER
on
10 Jul 2007
at
10:42
On the basis of world network data of neutron monitors and muon telescopes
at the Yakutsk and Nagoya stations the galactic cosmic ray anisotropy directed
transverse to the mean field line (in the direction of 15.00 LT) has been
revealed. This component undergoes the 11-year variation. Its value rises as
the IMF intensity, solar activity level and neutral sheet deformation increase.
Such
... More
Presented by Dr. Sardaana GERASIMOVA
on
10 Jul 2007
at
09:06
Voyager 1 (V1) continues to explore the heliosheath after crossing the solar
wind termination shock on 16 December 2004. Voyager 2 (V2) is observing
termination shock particles (TSPs) and may cross the shock at any time.
The source of the classic anomalous cosmic rays (ACRs) is still
under debate as it was not located at the shock where V1 crossed
(~34 N heliolatitude). The ACR spectrum at
... More
Presented by E. C. STONE
on
10 Jul 2007
at
11:18
On December 16, 2004 Voyager 1 at 94 AU crossed the heliospheric termination
shock and began the exploration of the vast region of the heliosheath. At the
termination shock the observed intensity of anomalous cosmic rays > 4 MeV/n was
much below that expected at what was generally believed to be their acceleration site
while the galactic cosmic ray intensity (150-380 MeV/n He) was close to its
... More
Presented by Prof. Frank B. MCDONALD
on
9 Jul 2007
at
17:25
A world grid of vertical cosmic ray cutoff rigidities was calculated using the
Definitive International Geomagnetic Reference Field for Epoch 1995.0. These
cutoff rigidity values show the effects of the continued evolution of the
geomagnetic field. The average cutoff values continue to decrease especially in
the South Atlantic and South American areas. However, in some areas of the
wo
... More
Presented by Dr. Don SMART
on
6 Jul 2007
at
14:45
A world grid of vertical cosmic ray cutoff rigidities was calculated using the
Definitive International Geomagnetic Reference Field for Epoch 2000.0. These
cutoff rigidity values were specifically computed for updating the aircraft
radiation dose. These cutoff rigidity values show the effects of the continued
evolution of the geomagnetic field. The average cutoff values continue to
de
... More
Presented by Dr. Don SMART
on
6 Jul 2007
at
14:45
The waiting time distribution of emissions in Coronal Mass Ejections (CMEs) with
several emissions is examined. We define the waiting time () as the time
interval between the commencement of an emission and the commencement of
the next emission considered as parts of a unique CME. The distribution seems
to follow a power-law.Two classes of CMEs several emissions are
considered: “clo
... More
Presented by Dr. Adolfo MENDEZ BERHONDO
on
4 Jul 2007
at
14:45
The rate of events measured with the surface detector (SD) of the Pierre Auger
Observatory is found to be
modulated by the weather conditions. This effect, observed in different ranges of
S(1000), the signal
measured at 1000 m from the shower core, is due to the increasing amount of matter
traversed by a shower
as the ground pressure increases and to the inverse proportionality of the Mo
... More
on
4 Jul 2007
at
14:45
Presented by Jose VALDES-GALICIA
on
3 Jul 2007
at
16:30
We discuss the small scale anisotropy signal predicted for present and future UHECR
experiments such as Auger, Telescope Array, Auger North and EUSO. We relax the
unrealistic, but commonly used assumption that the sources are all equal and we
concentrate our attention on how the expected signal depends on possible
distributions of the properties of the sources such as a luminosity function or
... More
Presented by Dr. Daniel DE MARCO
on
7 Jul 2007
at
10:42
In recent years, ground-based gamma-ray observatories have made a number of important
astrophysical discoveries which have attracted the attention of the wider scientific
community. The continuation of these achievements into the next decade will require a
new generation of observatories. In view of the long lead time for developing and
installing new instruments, the Division of Astrophysics
... More
Presented by Prof. Henric KRAWCZYNSKI
on
10 Jul 2007
at
11:42
We present a design for novel two-mirror aplanatic telescopes for use in
ground-based gamma-ray astronomy. Comparing to a traditional Davies-Cotton
reflector, an aplanatic telescope can achieve significant reduction of plate scale.
The telescope design can be configured to balance the need for wide-field of
view, high angular resolution, large light collecting area, and high degree of
un
... More
Presented by Stephen FEGAN
on
9 Jul 2007
at
14:45
Electromagnetic radiation from blazars can be observed from the radio band up to very high energy
gamma rays, with spectral energy distributions (SEDs) apparently characterized by a two-bump structure. So far,
most of the measured SEDs could be interpreted using simple leptonic origin scenarios, like Synchrotron Self-
Compton models. However, models where the gamma rays are due to accelerated
... More
Presented by Mr. Masaaki HAYASHIDA
on
6 Jul 2007
at
12:05
The relation between solar particle enhancements near the Earth and solar
flares properties is studied using as a working tool an extensive database of
SXR flares and proton fluxes. This database includes about 63000 SXR flares
observed by GOES satellites and >1200 proton enhancements over period of
time covered 1975-2006. Heliolongitudinal distribution of solar sources of the
most inten
... More
Presented by Dr. Evgenia EROSHENKO
on
5 Jul 2007
at
10:42
Extensive air shower (EAS) observation has been performed by
the compact and synchronized EAS arrays by LAAS experiments.
The zenith angle distribution and atmospheric effects were examined
in order to obtain EAS absorption coefficients in the air and the
relation between them and spectral index.
The atmospheric effects are going to be analyzed as function of
local solar time in harmonic a
... More
Presented by Dr. Atsushi IYONO, Ms. Chisato NODA
on
4 Jul 2007
at
14:45
The air shower size (Ne) spectrum of cosmic rays around the knee at different zenith
angles has been studied with the Tibet-III air-shower array. The air shower size is
estimated by fitting the lateral density distribution of the shower particles using
the modified NKG function, which is optimized by the Monte Carlo simulation by using
interaction models of QGSJET01c and SIBYLL2.1 taking into
... More
Presented by Dr. Jing HUANG
on
6 Jul 2007
at
10:54
The joint analysis of experimental data on cosmic ray fluxes measured in the
stratosphere at 1 a.u. and measured by Voyager - 1 spacecraft at the different
distances from the Earth is made. The relationship between cosmic ray fluxes in
the stratosphere and interplanetary magnetic field strength are used to get cosmic
ray flux outside the modulation region. The evaluation of the modulation reg
... More
Presented by Prof. Yuri STOZHKOV
on
9 Jul 2007
at
14:45
