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
Present