Event calendar file
3-11 July 2007
Merida, Mexico
Mexico/General timezone
- icrc2007@icrc2007.unam.mx
Support
Posters 2 + Coffee
Place
Location: Merida, Mexico
Room: Regency (Hyatt)
Date:
from 6 Jul 14:45 to 7 Jul 16:15
Description
OG 2.1-2.4; HE 1.5, 1.6; SH 1.8, 3.6
Contribution List
Displaying 253
contributions
out of
253
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
Detecting periodicity from a gamma-ray pulsar is exceedingly difficult without prior
knowledge of its pulsation frequency and frequency derivative. The low fluxes attainable in
the gamma-ray band mandate very long exposures, making the direct application of
Fourier analysis methods computationally prohibitive. We demonstrate that a new
analysis technique, based on analyzing the difference
... More
Presented by Prof. Robert JOHNSON
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
A study and review is made of the extragalactic gamma ray energy spectrum,
diffused over the energy range of 30 Mev to 10 Gev, on the basis that the
galactic clusters could be strong sources of diffuse gamma rays. The used data
in this approach are from EGRET instrument on the Compton Gamma Ray
Observatory. Comparing the results to the present Models, and other
measurements shows the e
... More
Presented by Mr. hamid ARJOMAND
MonRAt is a compact experiment aiming to measure the fluorescence radiation in the
atmosphere initiated by cosmic rays with energies between 100 TeV and 100 PeV. It is
composite by a spherical mirror, a multi-anodic photomultiplier and an ultraviolet
filter to select photons with wavelength between 300 and 450 nm. The monitor is
intended to contibute in problems such as the study of fluorescen
... More
Presented by Prof. M. A. LEIGUI DE OLIVEIRA
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
The Time Of Flight detector of the AMS-02 experiment is
composed by four layers of scintillator counters, two above (UTOF)
and two below (LTOF) the superconducting magnet.
All the 18 counters of the LTOF were characterized with a cosmic
ray telescope and tested in vacuum, and the lower part of the TOF
detector was assembled in the flight model.
In order to demonstrate the ability of the LTOF
... More
Presented by Dr. LUCIO QUADRANI
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
The response of the atmosphere circulation processes to the heliosphere action
is one of the most interesting problems of climatology. Northern hemisphere
atmosphere circulation processes has been investigated in connection with
solar activity phenomena, solar wind parameters, geomagnetic disturbance and
cosmic rays. It may be examined the chain of weather transformations as a
series, co
... More
Presented by Dr. Tatiana VAL'CHUK
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
6/7/2007
at
19:45
The relation between atmospheric pressure and trigger rate variation
is presented after live time correction in extensive air shower detected
by the ARGO-YBJ experiment (4300 m a.s.l., Tibet, P.R.China)
In particular we determine Fourier components of the temperature
near by the detector and atmospheric pressure in solar time, sidereal time
and antisidereal time. Also we obtain barometric coe
... More
Presented by Ms. Fengrong ZHU
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
Results of synchronous measurements of variations of intensity of cosmic rays
during forbush-decrease with the help of system of muon telescopes and a
spectrograph on local oscillation of neutrons are used. Coefficients of
connection for muons under different angles to zenith calculate with the help a
method of the trial detector proceeding from results of observations. The
method is bas
... More
Presented by Dr. Valery YANCHUKOVSKY
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
Massive stars in compact binaries produce strong winds in which collisions shock
waves are created. Hadrons can be accelerated on these shocks to energies expected
in the galactic component of the cosmic rays. We calculate different types of
radiation produced by these relativistic hadrons. They can serve as a signatures of
acceleration of hadrons up to about EeV energies.
Presented by Dr. Wlodek BEDNAREK
Cosmic rays from dark matter particles should couple to standard matter mainly
through the Higgs channel. We review various models which have been
proposed recently, and calculate relevant dark matter lifetimes and annihilation
cross sections.
Presented by Dr. Rainer DICK
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
The DUKS project (“Danish educational cosmic ray project”) is a future system of
scintillator detector stations at high-schools in the Copenhagen and Århus regions.
This presentation concerns the development of the DUKS project in Copenhagen.
Each DUKS station is composed of two plastic scintillator detectors (~1m2 each). GPS
signals are used to synchronize coincident events from the sepa
... More
Presented by Dr. Johan LUNDQUIST
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
In this paper we have considered the decay of gamma ray having very high
energy in presence of a strong magnetic field. It is assumed that a high
energetic photon may be splitted into electron-positron pair. To calculate such
decay process we have considered the possible Feynman diagrams and
calculated to obtain an analytical expression of the decay rate. We have
computed the decay rate
... More
Presented by Mr. Indranath BHATTACHARYYA
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
The Large Area Telescope (LAT) on the Gamma-ray Large Area Space Telescope
(GLAST) will have unprecedented sensitivity to gamma-ray sources. The
significantly improved signal-to-noise performance of GLAST relative to previous
missions greatly enhances the prospects of blind searches for radio-quiet
gamma-ray pulsars. We describe our search procedures, which are based on a
novel time-di
... More
Presented by Dr. Marcus ZIEGLER
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
In spite of the permanent advances in electronic particle detectors, the X-ray
emulsion chambers (XREC) still remain a unique tracking detector which enable
cosmic ray physicists to create large-scale set-ups (up to a few thousand
square meters) at mountain altitudes and to study with them a fine structure of
EAS cores resolving most energetic hadrons at distances about 10 microns.
To me
... More
Presented by Dr. Alexander BORISOV
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
Space radiation from galactic cosmic rays (GCR) is a major hazard to space crews,
especially in long duration human space explorations. For this reason, they will be
protected by radiation shielding that fragments the GCR heavy ions. Here we
investigate how sensitive the crew’s radiation exposure is to nuclear fragmentation
cross sections at different energies. We find that in deep space cro
... More
Presented by Dr. Zi-Wei LIN
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
Here we present a simple model for evolution of young radio galaxies. These objects
are known to form a numerous class of extragalactic radio sources, characterized by
the synchrotron spectrum peaking around GHz frequencies (`GPS sources'). Based on the
proposed model, we argue that inverse-Compton emission of ultrarelatvistic electrons
in sub-kpc-scale lobes of GPS galaxies should extend up t
... More
Presented by Dr. Lukasz STAWARZ
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
From in situ measurements in the heliosphere researchers
have reported the ``reservoir'' phenomenon during the decay
phase of gradual solar energetic particle events. Particle
intensities observed by different spacecraft during individual
gradual events are nearly equal even if the spacecraft are
separated by several AU in radius and latitudinal separations
as large as 70 degrees. M.~A
... More
Presented by Mr. C. PEI
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
6/7/2007
at
19:45
Atmospheric ionisation rate for the incident electrons and protons was
simulated using GEANT4 code. The photon-nuclei cascade generated by primary
particle is included in this code. Secondary bremstrahlung effect from electrons
causes peak ionisation at low altitudes in addition to the more powerful peak
at high altitudes. We discuss the contribution of helium to the total ionisation
rat
... More
Presented by Prof. Valery OSTRYAKOV
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
Be-7 radionuclide is (half life 53.3 days) is produced from cosmic ray interactions with atmospheric
nuclei. We analyzed long-term (1983-2006) variations in surface Be-7 concentrations in Japan
(geomagnetic latitude ~25N and cutoff rigidity 10 GV) to study an influence of the solar activity.
The measured Be-7 concentrations in surface air depend on not only a production rate of Be-7 but
al
... More
Presented by Prof. Masato YOSHIMORI
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
At present universally recognized software packages appeared on the
calculation of cascade processes in different medium and energy ranges. The
most fitted for our tasks version is the package of ATMOCOSMOS. Using this
software the integral multiplicities for neutron, muon and electron-photon
components of cosmic ray were obtained for different depths in the atmosphere
and for 1-100 GeV
... More
Presented by Dr. Viktor YANKE
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
The very high energy gamma-ray source HESS J1804-216 was discovered during the
H.E.S.S. galactic plane survey in 2004, and further observed in 2005 and 2006. It is
an extended source with a number of possible associations, including the pulsar PSR
B1800-21. Observations in X-rays with various X-ray satellites (including Suzaku and
Chandra) have been made of this region and the results of thes
... More
Presented by Dr. Conor MASTERSON
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
6/7/2007
at
19:45
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
6/7/2007
at
19:45
A simple model of hadronic cascade (Chudakov's model) in the atmosphere
gives muon and hadron spectra very similar to those obtained with full scale Monte
Carlo calculations made with various models of CORSIKA code, thus confirming that
not interaction model but cascade process plays the main role. A brief overview of the
experimental situation is given. It is shown that EAS trigger condit
... More
Presented by Dr. Yuri STENKIN
In August 2005, MAGIC telescope observed the cataclysmic variable AE Aquarii.
Observations were done during four consecutive nights within the context of a
coordinated quasi-simultaneous multiwavelength campaign covering radio, optical, UV,
and X-ray range. We report on the results of this campaign.
Presented by Ms. Nuria SIDRO MARTIN
on
6/7/2007
at
19:45
HESS J1303-631 is one of the unidentified TeV gamma-ray sources
which H.E.S.S. group discovered as a diffuse source.
We observed HESS J1303-631 between February and May in 2006
with the CANGAROO-III imaging atmospheric Cherenkov telescope system.
After considering the weather conditions, the total exposure is
about 35 hours live-time. Estimated threshold energy based on
the Monte Carlo
... More
Presented by Dr. Junko KUSHIDA
on
6/7/2007
at
19:45
The H.E.S.S. collaboration has reported the detection of gamma-ray emission from
eight new sources located in the Galactic Plane. HESS J1804-216 is one of the
brightest of them, and its size and photon index make it one of the largest and
softest sources. The H.E.S.S. collaboration proposed two possible counter parts,
young Vela-like pulsar B1800-21 and the SNR G8.7-0.1, but it does not perfec
... More
Presented by Mr. Yusuke HIGASHI
on
6/7/2007
at
19:45
During the first two years of regular operation, the MAGIC telescope has observed several
low frequency peaked BL Lacs at low redshifts between z=0.03 and z=0.54. The candidates
were taken from the 3rd EGRET catalog and the Donato catalog of X-ray bright objects
based on their GeV gamma ray and X-ray flux. About 140 hours of observation time has
been spent on these objects in total, 30 hou
... More
Presented by Dr. Daniel KRANICH
The ultra-luminous infra red galaxies (ULIRGs) have an enhanced starburst
rate which might be related to a large emission of very high
energy gamma rays.
Arp 220 is the nearest ULIRG (72 Mpc) and a well studied object.
This source was observed with the stand alone imaging atmospheric
Cherenkov telescope MAGIC for more than 15 hours on-source.
No significant gamma ray excess was detected dur
... More
Presented by Dr. vincenzo VITALE
on
6/7/2007
at
19:45
The high mass x-ray binary LSI +61 303 was observed for several months in 2006 and
2007 by VERITAS, an array of several imaging Cherenkov telescopes located at the Fred
Lawrence Whipple Observatory in southern Arizona. The unusual system of a black hole
or neutron star orbiting a Be star proves to be an efficient particle accelerator.
Here we present the detection of LSI +61 303 in very high
... More
Presented by Dr. Gernot MAIER
on
6/7/2007
at
19:45
The increase of the gamma-ray dose-rate in association with the activity of the
thunderstorm was observed by the detectors located at the ground level in the
winter of Japan. To investigate the particle acceleration mechanism during
winter thunderstorms, the four sets of radiation detectors were used which
consist of four long proportional counters (PRCs). These PRCs have a different
res
... More
Presented by Dr. Tatsuo TORII
on
6/7/2007
at
19:45
Observations of the blazars 1ES 0647+250 and 1ES 0806+524 with VERITAS
are reported here. These objects are among the favoured candidate
extragalactic sources in the very high-energy regime due to the
presence of high-energy electrons and adequate seed photons. The
presence of high-energy electrons is established from the location of
the synrchrotron peak in the spectral energy distribution o
... More
Presented by Dr. Peter COGAN
on
6/7/2007
at
19:45
The TeV emitting high-mass X-ray binary system LSI+61303 was observed with the
Swift satellite from early September 2006 to early January 2007. Many of these
observations were contemporaneous with TeV observations. The data consist of
observations on 24 separate days with durations ranging between 700s and
4700s, and cover 4.5 orbital periods of the binary system. We present here a
temporal a
... More
Presented by Dr. Jamie HOLDER
on
6/7/2007
at
19:45
VERITAS, the Very Energetic Radiation Telescope Array System, is an
array of four imaging Atmosphereic Cherenkov telescopes in southern
Arizona. It is sensitive to gamma-rays at energies above 100GeV. Here,
we discuss the results of observations of two well known VHE blazars,
Markarian 421 and Markarian 501, during Spring 2006 which were made
with the first two telescopes during the comission
... More
Presented by Stephen FEGAN
on
6/7/2007
at
19:45
PAMELA was launched on June $15^{th}$ 2006 in a pressurized container on board the
Russian Resurs-DK1 satellite. The satellite is flying in high inclination ($70^o$),
low Earth Orbit (350-600 km), performing measurements in different points and
conditions of the geomagnetosphere. The device is a multi-purpose apparatus
composed of a permanent magnet spectrometer to provide particle ch
... More
Presented by Dr. Marco CASOLINO
on
6/7/2007
at
19:45
The Crab nebula was observed with the Whipple 10 m telescope from September
2000 to March 2006 for a total exposure of nearly 200 hours. Standard
calibration and gamma-ray reconstruction methods applied to Whipple 10 m data
are described in detail. Measurements of the total and yearly Crab nebula
flux and energy spectrum are compared with recent results from Cherenkov
telescope systems. C
... More
Presented by Mr. Jeffrey GRUBE
on
6/7/2007
at
19:45
An unexpected rise of solar activity close to its minimum in December 2006 resulted
in four X-class flares and four energetic particle events. These events were observed
close to Earth and above 70 degree South by the Ulysses spacecraft, which was at a
heliocentric distance of 2.8 AU at that time. Three out of these four events produced
significant intensity increases up to several hundred MeV
... More
Presented by Prof. A. STRUMINSKY
on
6/7/2007
at
19:45
The Draco dwarf spheroidal galaxy has garnered interest as a possible source for the
indirect detection of dark matter. Draco has a large mass-to-light ratio, and its
relative proximity to the Earth provides favorable conditions for the production of
detectable gamma-rays from dark matter self-annihilation in the galaxy's core. The
Solar Tower Atmospheric Cherenkov Effect Experiment (STACEE)
... More
Presented by C. E. COVAULT
on
6/7/2007
at
19:45
Since 2005 the giant radio galaxy M87 has been observed in the 100 GeV energy domain
with the MAGIC Telescope. Results from the analysis of those observations will be
presented.
Presented by Mr. Markus MEYER
on
6/7/2007
at
19:45
Observations of the pulsar PSR B1951+32 with the Solar Tower Atmospheric Cherenkov Effect Experiment
We present the analysis and results of 12.5 hours of high-energy
gamma-ray observations of the EGRET-detected pulsar PSR B1951+32 using
the Solar Tower Atmospheric Cherenkov Effect Experiment (STACEE).
STACEE is an atmospheric Cherenkov detector, in Albuquerque, New
Mexico, that detects cosmic gamma rays using the shower front-sampling
technique. STACEE's sensitivity to astrophysical sources
... More
Presented by John KILDEA
on
6/7/2007
at
19:45
It is well known that anthropogenic activity can modify the Earth environment
in a global scale. Several restrictions and policies may be adopted in order to
attenuate the contamination effects and protect the environment. However, in
order to design and evaluate the impact of these policies and restrictions in the
human activity, it is important to identify if exists other sources that
... More
Presented by Dr. MANUEL ALVAREZ-MADRIGAL
on
6/7/2007
at
19:45
We have observed Crab pulsar in the TeV energy band using the Pachmarhi Array of
Cherenkov Telescopes for about 90 hours. Our observations span about 6 year period
from 2000 to 2006. We have analysed our data with using TEMPO package for analysing
pulsar data. We have searched for eveidence of pulsed emission of gamma rays from
crab pulsar using the contemporaneous radio pulsar parameters. We
... More
Presented by Prof. Bannanje Sripathi ACHARYA
on
6/7/2007
at
19:45
One of the main goals of Solar-Terrestrial Physics is to know how and when the
periodicities of Solar Activity do modulate terrestrial Climatic changes? The
purpose of this study is to examine the cosmophysical periodicities that could
possible be related with a modulation in the number and magnitude of
hurricanes.
Previous efforts on elucidating a plausible contribution of cosmophysica
... More
Presented by Prof. JORGE PEREZ-PERAZA
on
6/7/2007
at
19:45
A new tool monitoring the status of the fluorescence telescopes has been
developed to guarantee smooth operation of all detector components during
data taking. Monitoring data from FD telescopes are collected online
regularly during data acquisition as well as in dedicated modes such as
calibration. They are stored locally in databases that are replicated on a
dedicated central server. A web
... More
Presented by Prof. Karl-Heinz KAMPERT
on
6/7/2007
at
19:45
The LOPES-30 experiment, located with the air shower experiment
KASCADE-Grande at Forschungszentrum Karlsruhe, Germany, is an array of 30
dipole antennas set-up to investigate the pulsed radio emission from
cosmic ray air showers in the Earth's atmosphere. After one year of
measurements of the East-West polarization by all 30 antennas, recently,
the LOPES-30 set-up was reconfigured to perform
... More
Presented by Mr. Steffen NEHLS
on
6/7/2007
at
19:45
A new method for high energy cosmic ray detection was suggested by A.E.Chudakov in
1972. According to this method a reflected from the snow surface Cherenkov light is
observed by an optical camera lifted above the surface on the balloon.
Optical system of the SPHERE-2 detector consists of 1500mm diameter spherical mirror
and has 1sr view angle. Shmidt aperture diaphragm allows to reach 109 p
... More
Presented by Dr. Dmitry CHERNOV
on
6/7/2007
at
19:45
We present the proposal for reanimation of the half-built experimental complex
ANI at Mt. Aragats (Armenia, 3200 m a.s.l.). It is proposed as a first stage to
complete the functioning GAMMA installation by big X-ray emulsion chamber for
detailed study of EAS cores at energies 1-100 PeV.
Preliminary data obtained in this fieled by the Tien Shan “Hadron” installation
are presented.
T
... More
Presented by Prof. Sergey SHAULOV
on
6/7/2007
at
19:45
By using an 8-channel custom chip in GaAs technology, over 1.5*10^5 front-end
electronics channels were built, tested and installed in the resistive plate
chambers (RPCs) of the ARGO-YBJ experiment. These channels were designed
to obtain 1 ns time resolution over about 6000 m^2 of sensitive area. Here we
present the design features, the performance and the results during a long
operation
... More
Presented by Prof. Roberto CARDARELLI
on
6/7/2007
at
19:45
The near UV glow of the night atmosphere and near UV transient events in the
atmosphere are sources of the background phenomena in search for ultra high
energy cosmic ray fluorescence signals in the atmosphere. Nature of the UV
atmospheric transient events is not known yet and more experimental data on
them are needed. Study of space-time development of UV transient events is
suggeste
... More
Presented by Mr. Epifanio PONCE
on
6/7/2007
at
19:45
HESS observations of the galactic plane have revealed several confirmed and
candidate pulsar wind nebulae (PWN), which show that pair production in
pulsars is significant and that many of these PWN are particle dominated to
give a detectable signal via IC scattering on the CMBR. The lifetimes of
electrons from the low energy (uncooled) spectral tail, scattering soft photons
into the GLAS
... More
Presented by Prof. Ocker DE JAGER
The Northern sky pulsar wind nebula 3C58 has been regarded as the
remnant of the SN1181, although radio expansion rate and optical
filaments velocity measurements suggest a larger age for this
nebula. We present two approaches for solving the transport equation
of particles in a convective wind. On the one hand, a 2D evolution
modeling employs the proper boundary conditions to expl
... More
Presented by Ms. Ester Aliu ALIU
We present results of simulations of muon content in the air showers induced
by very high energy cosmic rays. Muon energy distributions and muon densities
at ground level are given. We discuss a prompt muon component generated by
decays of charmed mesons. The method combines standard Monte Carlo
generators incorporated in the CORSIKA code and phenomenological estimates
of charm hadroprod
... More
Presented by Dr. Jan RIDKY
on
6/7/2007
at
19:45
The space TUS detector of UV fluorescence light radiated by EAS of Ultra
High Energy Cosmic Rays (UHECR) is under preparation. The TUS optical system
will consist of the Fresnel mirror-concentrator of ~2 sq. m. and 256 PMT pixels
as the photo receiver at the mirror focal surface. The 2 PMT pixel prototypes
were tested and used for data taken at the “Universitetsky-Tatiana” and
Compas
... More
Presented by Dr. LEONID TKACHEV
on
6/7/2007
at
19:45
In the paper the results of investigation of radiational situation in the space
near the Earth at the different altitudes of the Earth atmosphere and at the
ground level in dependence on geocoordinates and solar activity during 1957 -
2000 are presented. Radiation is due to the Galactic Cosmic Rays flux for
different periods of the Solar activity. The radiation near ground level of the
E
... More
Presented by Dr. Abai AITMUHAMBETOV
The main goal of the CODALEMA experiment, located in the Station de Radioastronomie
de Nançay, France, is the radiodetection of extensive air showers initiated by high
energy cosmic rays using log-periodic antenna and short active dipoles in the 1-200
MHz bandwidth.
First results showed that both antennas are able to detect the transient radio
signals emitted by extensive air showers.
In ad
... More
Presented by Mr. Jacob LAMBLIN
on
6/7/2007
at
19:45
Simulations of geosynchrotron radio emission from extensive air showers
performed with the Monte Carlo code REAS1 used analytical parameterisations
to describe the spatial, temporal, energy and angular particle distributions
in air showers. The successor REAS2 replaces these parameterisations with
precise, multi-dimensional histograms derived from per-shower CORSIKA
simulations. REAS2 al
... More
Presented by Dr. Tim HUEGE
on
6/7/2007
at
19:45
We consider the internal shock formation in magnetized outflows and we
examine the plastic collision between such relativistic blobs taking
into account a possible dissipation of magnetic flux. We find that
after the collision a large amount of energy is released in
thermal form and consequently we assume that this is transferred
into protons which obtain a relativistic
Maxwellian distribut
... More
Presented by Dr. Apostolos MASTICHIADIS
on
6/7/2007
at
19:45
The Southern Auger Observatory provides an excellent test bed to study the
radio detection of extensive air showers as an alternative, cost-effective, and
accurate tool for cosmic-rays physics. The data from the radio setup can be
correlated with those from the well-calibrated Auger baseline detectors.
Furthermore, human-induced radio noise levels at the Southern Auger site are
relativel
... More
Presented by Dr. Ad VAN DEN BERG
on
6/7/2007
at
19:45
We report here our observations on particle counting rates with 10-20 mm
thick plastic scintillation detectors used for studies on air showers at
CERN and Ooty. Due to efficient and uniform collection of scintillation
photons with 20-30 wave-length shifting fibers placed in parallel above
the scintillator surface, the number of photoelectrons collected by the
photomultiplier is relatively lar
... More
Presented by Prof. Suresh TONWAR
Telescope Array (TA) is a EAS detector which is now building in the
western desert in Utah, USA.
In order to estimate the performance of TA, a detailed detector
simulation is being developed in Java. The number
of particles produced during the development of the EAS shower with
various inclinations is calculated by
COSMOS code.
Surface detector (SD) of TA consists of two layers of plastic
... More
Presented by Dr. Nobuyuki SAKURAI
on
6/7/2007
at
19:45
The modeling analysis of 15 large GLEs occurred in the period 1956-2006 on
the data of the worldwide neutron monitors has been performed. In all studied
cases two distinct RSP populations (components) were revealed: the early
impulse-like intensity increase with exponential energy spectrum (prompt
component, PC), and the late gradual increase with a softer energy spectrum of
the power la
... More
Presented by Prof. Eduard VASHENYUK
on
6/7/2007
at
19:45
IceTop is the surface component of the IceCube neutrino telescope at the South Pole.
It will serve as an air-shower array that consists of cylindrical tanks of clear ice.
Electrons, positrons, gamma rays and muons produce Cherenkov radiation directly or
through interaction products. It is therefore important to have a good understanding
of these processes. A thorough knowledge will permit the
... More
Presented by Mr. Peter NIESSEN
on
6/7/2007
at
19:45
We present the analysis and results of recent high-energy gamma-ray
observations of the high energy-peaked BL Lac (HBL) object 1ES 1218+304 with
the Solar Tower Atmospheric Cherenkov Effect Experiment (STACEE). 1ES
1218+304 is an X-ray bright HBL at a redshift
z=0.182, and has been predicted to emit high energy gamma rays above
100 GeV, detectable by ground-based Cherenkov telescopes. Recent
... More
Presented by Reshmi MUKHERJEE
on
6/7/2007
at
19:45
ARGO-YBJ is a "full coverage" air shower detector consisting of a 6700 m^2
carpet of Resistive Plate Chambers, located at Yangbajing (Tibet, P.R. China,
4300 m a.s.l.).
Its large field of view (~2 sr) makes ARGO-YBJ particularly suitable to
detect unpredictable and short duration events such as Gamma Ray Bursts.
ARGO-YBJ can search for GRBs using two detection techniques: the "Scaler
Mod
... More
Presented by Dr. Piero VALLANIA
on
6/7/2007
at
19:45
We present the current status of the search for sources and prospects for
gamma-ray astronomy in the PeV energy domain using the extensive air
shower detector array GAMMA, situated at 3200 m a.s.l. on Mt. Aragats,
Armenia. The recent extension of the array with detectors at a distance of 100
m from the array center improves the reconstruction accuracy for high-energy
showers. We examine
... More
Presented by Dr. R.M. MARTIROSOV
We present recent results of a search for pulsed very-high-energy (VHE) gamma-ray
emission from pulsars using data taken with the High Energy Stereoscopic System
(H.E.S.S.), an array of imaging Cherenkov telescopes located in Namibia. The data
set, accumulated during four years of operation until 2006, comprises observations of
eleven young pulsars, selected according to their spin-down lumino
... More
Presented by Mr. Matthias FUESSLING
on
6/7/2007
at
19:45
The galaxy clusters might be the TeV gamma-ray sources with Inverse Compton
scattering of photons by non-thermal electrons eccelerated by the chocks and galactic
wind. The Tibet-III air shower array has a wide field of view and a high-duty cycle
to observe celestial bodies in the TeV energy range. In this analysis we checked
three galaxy clusters, Perseus, Coma and Virgo using the Tibet-III da
... More
Presented by Mr. Xiao WANG
The large area tracking muon telescope in the GRAPES-3 experiment
allows determination of the muon content of the detected extensive air
showers with good precision. Detailed Monte Carlo simulations have been
carried out to determine the muon content of nucleon induced showers.
Using the results of these simulation we try to identify the sample of
potential gamma induced showers in the data.
... More
Presented by Prof. Sunil GUPTA
A space detector has an advantage of observing during a year the arrival
directions of ultra-high-energy (UHE) cosmic-ray (CR) particles from the
whole sky. We study the prospects of detecting global asymmetries predicted
by two distinct scenarios of the origin of UHECR: the Galactic dipole
asymmetry expected in the superheavy dark-matter scenario and asymmetries
expected if sources of U
... More
Presented by Mr. Pavel KLIMOV
The GRAPES-3 experiment observes extensive air showers using a high-density array of
scintillators and a large area tracking muon detector. The array consists of 300
scintillation detectors (each 1m^2 in area) and 16 modules of muon detectors having a
total area of 560m^2. We have developed a new method of detector time offset
correction to
improve the angular resolution of the array by usin
... More
Presented by Mr. Akitoshi OSHIMA
on
6/7/2007
at
19:45
Pulsed emission of gamma/X rays from Geminga pulsar were detected earlier at the
period of ~237 msec using EGRET/ROSAT instruments. However, there are conflicting
reports about emission of pulsed gamma rays from this pulsar at very high energies.
We have observed this source for about 56 hours using the PACT setup during the last
6 years spanning c. 2000 to 2006. This pulsar was found to und
... More
Presented by Prof. Bannanje Sripathi ACHARYA
on
6/7/2007
at
19:45
We observe the steady emission of multi-TeV gamma rays from
the crab nebula from observation of the Tibet air shower array.
In this conference, we will also report that no evidence for long-term
variability of flux intensity from the Crab Nebula is found.
In this article, we will present the result that a search for pulsed
multi-TeV gamma rays emission from crab pulsar using data taken
wi
... More
Presented by Prof. Kinya HIBINO
on
6/7/2007
at
19:45
One interesting possibility is that the galactic center source HESS J1745-290
is associated with the galactic center source Sgr A*, the galactic center black
hole, in which case we may expect variability as seen in IR and X-rays, with
QPO frequencies predicted by Aschenbach et al. (2004). We will present the
results of a search for such variable signatures using HESS observations of this
sou
... More
Presented by Prof. Ocker DE JAGER
on
6/7/2007
at
19:45
The origin of the ultra-high energy cosmic rays (UHECRs; several times 10^19 eV and
higher) is an open question
in the astroparticle physics. So far no astrophysical object has been still
identified as UHECR sources within a limited
source distance of several tens of Mpc by the Grisen-Zatsepin-Kuzmin effect. In
accelation of such particles, the
very high energy (VHE) gamma-ray emission
... More
Presented by Dr. Kenji Shinozaki SHINOZAKI
on
6/7/2007
at
19:45
The Gould belt, a well-known region of enhanced star formation in the solar
neighborhood, is observed to be an expanding rim with a diameter of a few
hundred parsecs and a width of approximately 100 pc. Most of the nearby
OB stellar associations and molecular clouds are found to be
aligned with the Gould belt. With the high star formation rate along the
Gould belt, the local supernova rate
... More
Presented by Dr. D. HORNS, Dr. G. P. ROWELL
on
6/7/2007
at
19:45
Westerlund 1 is a unique case of a massive young cluster with at least 11
Wolf-Rayet stars driving strong stellar winds. It is possible that various
configurations of these stellar winds (wind-wind interaction, superposition of
stellar winds etc.) can convert a fraction of the kinetic energy of the wind
into accelerated particles. Observations of spatially extended non-thermal
X-ray emiss
... More
Presented by Dr. Dieter HORNS
on
6/7/2007
at
19:45
We present a detailed leptonic model for the spectral evolution of TeV blazars.
Synchrotron emission is modelled, with the TeV component explained by both Inverse
Compton upscattering of synchrotron photons and photons originating externally to the
jet. The Broad Line Region and accretion disc are considered for the source of soft
external target photons. We investigate the effects on the emis
... More
Presented by Ms. Ana MILOVANOVIC
on
6/7/2007
at
19:45
Ground based telescopes have marginally observed very high energy emission (>100GeV)
from gamma-ray bursts(GRB). For instance, Milagrito observed GRB970417a with a
significance of 3.7 sigmas over the background. Milagro have not yet observed TeV
emission from a GRB with its triggered and untriggered searches or GeV emission with
a triggered search using its scalers. These results suggest the n
... More
Presented by Dr. Maria Magdalena GONZALEZ SANCHEZ
on
6/7/2007
at
19:45
The Tibet air shower array, consisting of 533 scintillation counters
which are placed in a lattice with 7.5 m spacing, has been in
operation since 1999 at Yangbajing in Tibet, China at an altitude of
4,300 m above sea level. In this conference, we will report on the
continuous observation of multi-TeV gamma rays from the Crab Nebula
with the Tibet air shower array. We found no evidence for
... More
Presented by Dr. Masato TAKITA
on
6/7/2007
at
19:45
Daily temperature variation in the electronic box of the surface detector in the
Pierre Auger Observatory may reach more than 40ºC, which causes a significant
variation of the pedestal of FADC traces. Pedestal variation, more than 5 ADC–
counts in full temperature range, could significantly affect the trigger conditions
especially for the Time-over-Threshold Trigger working at very low t
... More
Presented by Dr. Zbigniew SZADKOWSKI
on
6/7/2007
at
19:45
Solar Energetic Particle event onset times have been traditionally studied by using
the velocity dispersion analysis. Using spacecraft at 1 AU, the derived apparent path
lengths can vary between 0.5 AU and 3 AU, while the distribution peaks at the
nominal range (1-1.5 AU). The recently introduced simulation approach to the onset
research takes into account the effect of the interplanetary sca
... More
Presented by Mr. Kalle HUTTUNEN-HEIKINMAA
Earth-skimming neutrino experiment such as NuTel or CRTNT detects air
shower, which is produced by decay of tau lepton, from near horizontal
direction. Traditional shower simulations have difficulty in simulating shower at
zenith angle near 90 degree, where some variables diverge to infinity. Recent
CORSIKA simulation code had updates on simulation of horizontal air shower.
We also deve
... More
Presented by Dr. TsungChe LIU
on
6/7/2007
at
19:45
UHE cosmic ray ESA (above 10^15eV) are continuously being detected by the
Mini array laboratory, Department of Physics, Gauhati University [1]] using
Linseley’s novel Miniarray method [2]. The detector array consist of eight
plastic scitilatillation counter (size:50x50x5cm3) with total carpet area 2m^2
inside a hut situated at the roof top of the Physics building, Gauhati Univ
... More
Presented by Mr. Nayanmoni SAIKIA
In the TUS detector being prepared for launch on the separate platform the
mirror- concentrator is enlarged to 2 sq. m, the photo receiver electronics is
ready to register not only short EAS signals (less than 100 microseconds) but
also long signals from TLE events. The registration of EAS and TLE events were
simulated taking into account data on atmosphere glow and TLE events from
the
... More
Presented by Mr. Pavel KLIMOV
It has previously been suggested that the Jicamarca Radio Observatory (JRO) could be
used for the detection of extended air showers using radar echo [1]. The use of radar
is appealing as it could allow to map the longitudinal development of air showers
through the atmosphere. This paper presents studies on the implementation of an array
of particle detectors (scintillator, water tank) at the J
... More
Presented by Dr. David WAHL
on
6/7/2007
at
19:45
It is well known that on many middle and high latitude stations (especially on
the mountains) the snow effect is very important (see review in [1]). We
develop method for determining of this effect on the basis of multi-station
analysis. It made possible to remove this effect from observation data and to
use corrected data in long-term and short-term CR variations analysis.
References:
... More
Presented by Dr. Lev PUSTILNIK
The modeled and observed responses of neutron monitors of two various
types: the standard 3NM-64 and a leadless 4NMD one at the SANAE South
African Antarctic station during a number of large GLE events were compared to
precise the specific yield of the NMD at low rigidity range. The parameters of
primary relativistic solar protons outside magnetosphere: rigidity spectrum,
anisotropy dire
... More
Presented by Dr. Yury BALABIN
on
6/7/2007
at
19:45
Energy spectra of solar protons during the 20 January 2005 event have
been determined by using data of the neutron monitor network. The
obtained energy spectra were extrapolated down to 100 MeV and used as
input of the GEANT4/PLANETOCOSMICS code to simulate the interactions of
cosmic ray particles in the atmosphere. The computations with
GEANT4/PLANETOCOSMICS gave angular and energy distribut
... More
Presented by Dr. Vladimir MAKHMUTOV
We report, a survey on transient events measured at sea level using a new technique
on the basis of a muon telescope with a tracking system and working with a high
counting rate (~100 kHz). Results during the solar events on 2005/05/13 are
presented. Although we have only the data in the last 12 hours under ideal condition
(telescope always oriented to the IMF lines), it is possible to see w
... More
Presented by Dr. Carlos NAVIA
For the calorimetric determination of the primary energy of extensive air showers,
measured by fluorescence telescopes, a precise knowledge of the conversion factor
(fluorescence yield) between the deposited energy in the atmosphere and the number of
emitted fluorescence photons is essential. The fluorescence yield of the eight
strongest nitrogen emission bands between 300 nm and 400 nm has be
... More
Presented by Dr. Tilo WALDENMAIER
on
6/7/2007
at
19:45
The ARGO-YBJ ground-based detector allows to investigate many issues in
gamma-ray astronomy and cosmic ray physics spanning a large energy range
by means of its ability to operate down to a few hundreds of GeV up to a few
PeV. The apparatus consists of a single layer of about 2000 Resistive Plate
Chambers (RPCs) for a total instrumented area of ~6700 m2. The whole
detector has been fully
... More
Presented by Cristian STANESCU
on
6/7/2007
at
19:45
The MEMSTEL (Micro Electro Mechanical Systems Space Telescope) is a space
based experiment being designed to investigate the origin of extreme energy
cosmic-ray (EECR) particles above 5 x 10^19 eV. The fluorescent light
generated in extensive air showers (EAS) when EECRs hit the atmosphere can
be detected from low Earth orbit. MEMSTEL will implement a novel idea of a
tracking mirror base
... More
Presented by Dr. Moo Hyun LEE
on
6/7/2007
at
19:45
Study of the Atmospheric Electric Field and EAS particle increase during thunderstorms with ARGO-YBJ
The study of the Atmospheric Electric Field (AEF) and EAS particle increase
during thunderstorms is very significant to understand the effects of AEF on
secondary cosmic rays detected on ground. In this paper, the short term
variations of scaler mode counts are studied during thunderstorms when the
AEF has violent changes. Since April 1st to August 14th, 2006, lightnings have
been record
... More
Presented by Mr. Bin XU
A new significant solar energetic particle event was recorded by the ground
level neutron monitor network during the descending phase of the 23rd solar
cycle. This ground level enhancement event (GLE 70) occurred on 13 December,
2006 during a magnetically disturbed period manifested by a series of Forbush
decreases of the cosmic ray intensity at neutron monitors, starting from 6
December
... More
Presented by Ms. Yunqiu TANG
In this work numerical simulations showing the time evolution of a supernova
remnant (SNR) in an uniform and non-uniform intersteller medium (ISM) are
presented. For this we use a hydrodynamic model including a kinematic
calculation of the interstellar magnetic field. Important parameters include the
ejecta mass and energy of the remnant, as well as interstellar medium density
and adiaba
... More
Presented by Dr. Stefan FERREIRA
on
6/7/2007
at
19:45
Space detectors of UV fluorescence and Cherenkov light radiated by ultra high
energy extensive air showers (UHECR EAS) have advantages of high EAS
detection aperture in observing the whole sky by one instrument and will be
able to get statistically rich results on the UHECR arriving directions.
At the same time the space environment and particularly variable UV
background intensity put so
... More
Presented by Prof. Fumiyoshi KAJINO
on
6/7/2007
at
19:45
In this contribution we discuss models of the X-rays and TeV gamma-ray emission from
BL Lac objects based on parallel electron-positron or electron-proton beams that form
close to the central black hole owing to the strong electric fields generated by the
accretion disk and possibly also by the black hole itself. Fitting the energy
spectrum of the BL Lac object Mrk 501, we obtain tight constra
... More
Presented by Prof. Henric KRAWCZYNSKI
Two types of radionuclides, cosmogenic Be-7 (half life 53.3 days) and terrestrial Ra-226 (half life
1600 years), were measured in Tokyo in 2002-2006. Be-7 is produced by galactic cosmic rays in
the upper atmosphere and Ra-226 is a decay daughter of the uranium-series radionuclide. The
concentrations of these radionuclides in surface air were determined from a gamma-ray
spectroscopic experi
... More
Presented by Prof. Masato YOSHIMORI
The low-frequency peaked BL Lac object (LBL) 3C66A was subject of an extensiv
multi-wavelength campaign from July 2003 till April 2004, which includes
quasi-simultaneous observations at optical, X-rays and very high energy (VHE)
gamma-rays. Here we apply the hadronic Synchrotron-Proton Blazar model to the
observed spectral energy distribution at various activity states, and compare the
result
... More
Presented by Dr. Anita REIMER
Atmospheric monitoring is indispensable to calibrate the
reconstruction of extensive air shower that observed by air
fluorescence telescope. The Telescope Array (TA) experiment is using
an air fluorescence technique along with a shower array system to
observe the ultra-high energy cosmic ray. And we adopted two laser
systems measuring the atmospheric transmittance to calibrate the
Fluoresc
... More
Presented by Dr. shigeharu UDO
on
6/7/2007
at
19:45
During December 13 2006 a ground-level enhancement was recorded by the
world-wide network of neutron monitors. This paper discusses the response of
three cosmic ray detectors characterized by different rigidity cutoffs: LARC (King
George Island - Antarctica), SVIRCO (Rome - Italy) and OLC (Santiago of Chile).
*: Research partly supported by the Italian Antarctic Research Program.
Presented by Dr. MARISA STORINI
on
6/7/2007
at
19:45
The Extreme Universe Space Observatory on JEM/EF (JEM-EUSO) is a space mission to study extremely high-energy
cosmic rays. The JEM-EUSO instrument is a wide-angle refractive telescope in near-ultraviolet wavelength region to
observe time-resolved atmospheric fluorescence images of the extensive air showers from the International Space
Station. The focal surface is a spherical curved surface,
... More
Presented by Dr. Yoshiya KAWASAKI
on
6/7/2007
at
19:45
The Front-End Cards of the Pierre Auger Surface Detectors: Test Results and Performance in the Field
The Pierre Auger Observatory, presently under construction in Argentina, is nearing
completion. The instrument is designed to
measure the highest energy cosmic rays with unprecedented resolution and statistics.
Its surface array comprises 1600 water
Cherenkov detectors distributed over an area of 3000 km2. The Cherenkov light of each
tank is detected by three 9-inch
photomultipliers from whi
... More
Presented by Karl-Heinz KAMPERT
on
6/7/2007
at
19:45
The ‘HEllenic LYceum Cosmic Observatories Network’ - HELYCON collaboration is
establishing a network of detector stations distributed over western Greece. The goal
of HELYCON is to observe extensive air showers and to collect data
corresponding to the flux, the direction and correlations between very energetic
cosmic rays. In parallel this project aims to provide the educational platform t
... More
Presented by Mr. Georgios BOURLIS
Efficient cosmic-ray production can have a significant effect on the evolution of
SNRs and will modify thermal X-ray line emission as well as producing broad-band
continuum radiation. Using a hydrodynamic simulation with ad hoc magnetic field
amplification and an approximate treatment for the ionization state of the plasma, we
investigate the effects of slow vs. rapid heating of the postshock
... More
Presented by Prof. Don ELLISON
The LOFAR radio telescope, under construction in the Netherlands, will be a powerful instrument
to measure extensive air showers through their radio signal. In order to fully understand the
properties of these signals, we are building a library of CORSIKA simulations of showers at
10^16--10^20.5 eV on the LOFAR BlueGene supercomputer. This library contains histogrammed
data on the
... More
Presented by Mr. Sven LAFEBRE
on
6/7/2007
at
19:45
The intrinsic distribution of spectral indices in GeV energies of gamma-ray–loud
blazars is a critical input in determining the spectral shape of the unresolved
blazar contribution to the diffuse extragalactic gamma-ray background, as well as an
important test of blazar emission theories. We present a maximum-likelihood method of
determining the intrinsic spectral index distribution (ISID) o
... More
Presented by Ms. Tonia VENTERS
on
6/7/2007
at
19:45
The TA Low Energy Extension will include a Tower FluorescenceDetector. Extensive air
showers at the lowest usful energies for fluorescence detectors will in general be
close to the detector. This requires viewing all elevation angles to be able to
reconstruct showers. The TALE Tower Detector, operating in conjunction with other
TALE detectors will view elevation angles up to above 70 degree
... More
Presented by Prof. Douglas BERGMAN
on
6/7/2007
at
19:45
The BL Lac object (blazar) Mrk 421 was observed in a high emission state in April
2005 with the Whipple 10 m telescope for about 24.5 hrs. The measured gamma-ray rate
varied substantially over the range of 4 to 10 γ’s/min and eventually exceeded the
steady γ-ray rate of the Crab Nebula (the standard candle) by a factor of 3. The
overall significance of the gamma-ray signal reached 50σ and
... More
Presented by Dr. Alexander KONOPELKO
on
6/7/2007
at
19:45
With H.E.S.S., a system of four Cherencov telescopes, a signal of very high energy
TeV-$\gamma$-radiation from the direction of the Galactic center has been detected.
The interpretation of the signal due to dark matter annihilations is discussed and
limits on the annihilation cross sections and density profiles are given. This is an
update of earlier publications including recent observations
... More
Presented by Joachim RIPKEN
on
6/7/2007
at
19:45
The physics goals of the The Telescope Array Low-Energy Extension (TALE)
include the hybrid measurement of spectrum and composition of cosmic rays down
to energies below 10^17 eV. To achieve composition measurements from
observation of extensive air showers, a ground array detector must have the
ability to distinguish the muonic and electromagnetic components of a shower.
Here, we consid
... More
Presented by Prof. John BELZ
on
6/7/2007
at
19:45
The Telescope Array Project (TA) is an Ultra High Energy Cosmic Ray
Observatory in central Utah. It performs a hybrid measurement of the
extensive air showers induced by cosmic rays. The two detector systems
are 1) an array of 576 scintillation detectors and 2) three fluorescence
telescope observatories which overlook the ground array. The Telescope
Array will measure the study spectral sh
... More
Presented by Dr. John Norman MATTHEWS
on
6/7/2007
at
19:45
The ARGO-YBJ experiment has now reached its final design configuration. The
detector system consists of a full coverage array ( about 5800 m2) of Resistive
Plate Chambers (RPCs). At the nominal threshold the system must be able to
sustain a maximum transfer rate of the order of 15 MB/s and an high peak data
flow. Data are read out using a typical front-end acquisition chain built around a
... More
Presented by Cristian STANESCU
on
6/7/2007
at
19:45
The dependence of the muon flux from the atmospheric parameters (pressure and
temperature) is a well known effect since long time ago, that is usually
corrected for in cosmic ray measurements. We have correlated at EAS-TOP (LNGS)
the muon flux detected by the EMD detector (29 stations, 10m^2 each,
E_thr>3MeV) with the atmospheric temperature (10-1000mb levels) monitored by
the radio-soundings
... More
Presented by Dr. Mario BERTAINA
on
6/7/2007
at
19:45
We present a detailed study of the impact
of jet expansion on the emission properties of blazars, in particular
their gamma-ray lightcurves, based on the notion that the radiation is produced in an
emission zone that is travelling down the jet.
Using analytical estimates and numerical studies with a particular model
of particle energization, we conclude that AGN jets must be very well
collim
... More
Presented by Prof. Martin POHL
on
6/7/2007
at
19:45
The extra-high energy (above 10^17 eV) extensive air showers may be used as a trigger
for registration of the acoustic signals from the seismically active medium. This
possibility is due to creation of the microscopic seed fissures by energetic muons
deeply in the Earth (tens of kilometers). If some seismic tension is present in the
medium, the fissures start to quickly develop, emission of ac
... More
Presented by A.P. CHUBENKO
For the newly build extensive air shower array of the Tien-Shan mountain complex ATHLET
is designed the new type of a large-size charged particles detector on the basis of the thin
molded polystyrene scintillator in conjunction with the wavelength shifting fibers. The 10 mm
thick scintillation plates have a 1x1 m^2 sensitive area, a 99% registration efficiency of the
charged particles and
... More
Presented by A.L. SHEPETOV
on
6/7/2007
at
19:45
The prototype Cosmic Ray Tau Neutrino Telescopes (CRTNT) are operated at the
Yangbajing Cosmic Ray Observatory (4300 m a.s.l Tibet, P.R.China). To evaluate
the performance of the CRTNT prototype, two telescopes are operated in
stereoscopic mode and in coincidence with the ARGO-YBJ detector. Air shower
simulation (based on CORSIKA), detector simulation, and event reconstruction
are combin
... More
Presented by Dr. Bai YUNXIANG
The LHCf is an early time physics experiment of the CERN Large Hadron Collider. The
LHCf will provide an indispensable data on the energy and transverse momentum spectra
of neutral particles in the very forward region at 1x10^17eV. The LHCf apparatus is
composed of two independent detectors installed +/- 140m and at zero degree collision
angle from the ATLAS interaction point. Each detector ha
... More
Presented by Mr. Hiroaki MENJO
on
6/7/2007
at
19:45
The TeV blazars Mrk 421, Mrk 501, PSK 2155-304 and 1ES1959+650 are among the brightest known blazars,
yet the existing experimental set of data does not allow one to make unambiguous statements about the physical
mechanisms responsible for the electromagnetic emission. The lack of sensitive coverage in the energy range 1
MeV to 500 GeV (up to 2004), and the scarce truly simultaneous data res
... More
Presented by Dr. David PANEQUE
on
6/7/2007
at
19:45
As it was showed earlier the EAS array Carpet at the Baksan neutrino
observatory (N43.3 E42.7) owing to the large area (200 m2) has appeared
more effective in detecting the solar proton effect than a neutron monitor at
geomagnetic cutoff ~ 6 GV. However, for use of this instrument in deriving the
solar proton parameters it is necessary to know exact specific yield function
(SYF) at rathe
... More
Presented by Dr. Yury BALABIN
The trigger system of JEM-EUSO should face
different major challenging points: a) cope with the limited down-link
transmission rate from the ISS to Earth, by operating a severe on-board
and on-time data reduction; b) use very fast, low power consuming and radiation
hard electronics; c) have a high signal-over-noise performance and flexibility
in order to lower as much as possible the energy t
... More
Presented by Dr. Mario BERTAINA
on
6/7/2007
at
19:45
Gamma-ray bursts (GRB) sign energetic explosions in the Universe, occurring at
cosmological distances. Multi-wavelength observations of GRB allow to study their
properties and to use them as cosmological tools.
In 2011 the space borne gamma-ray telescope ECLAIRs is expected to provide accurate
GRB localizations on the sky in near real-time, necessary for ground-based follow-up
observations.
... More
Presented by Dr. Stéphane SCHANNE
on
6/7/2007
at
19:45
It is shown that recording of thermal neutrons accompanying the EAS with
specific scintillator detectors for thermal neutron detection
gives a new and very interesting additional information.
Results of CORSIKA based Monte Carlo simulations as well as preliminary
experimental data are presented. A new method to study Extensive Air
Showers is proposed.
Presented by Dr. Yuri STENKIN
on
6/7/2007
at
19:45
Obseravations of neaby blazar PKS 2155-304(z=0.116) was performed
in July and August 2006 with the CANGAROO-III atmospheric Cherenkov
telescope in South Australia, which was triggered by the H.E.S.S.
group as a high state. Stereo observations with three telescopes
were performed except for the observations done before culmination
in each night of July periods due to mechanical tracking proble
... More
Presented by Prof. Kyoshi NISHIJIMA
on
6/7/2007
at
19:45
The new EAS Cherenkov array Tunka-133 of a sensitive area about 1 km^2 is mounting in
Tunka valley since the end of 2005. The new array will permit a detailed study of cosmic ray
energy spectrum and mass composition in the energy range 10^15 - 10^18 eV with the
unique method. The array will consist of 19 clasters each containing 7 optical detectors. The
first claster started operation sinc
... More
Presented by Prof. Vasily PROSIN
on
6/7/2007
at
19:45
A sample of selected active galactic nuclei (AGN) was observed
from 2005 to 2007 with the High Energy Stereoscopic System (H.E.S.S.),
an array of imaging atmospheric-Cherenkov telescopes in Namibia.
Significant detections for some of these objects are reported
elsewhere. Integral flux upper limits for the other candidate
very-high-energy (VHE; >100 GeV) gamma-ray emitters will be presen
... More
Presented by Dr. Wystan BENBOW
on
6/7/2007
at
19:45
Starburst galaxies are characterized by extremely high star-formation rates and, as a
consequence, very high supernova rates. These rates, as well as the gas density, are
orders of magnitude higher than in our Galaxy. Such an environment contains both a
high cosmic ray flux and high density of target material for pp and inverse compton
interactions. These objects are therefore viable candidate
... More
Presented by Mr. Dalibor NEDBAL
on
6/7/2007
at
19:45
The variations of anisotropy of primary spectrum of cosmic rays (CR) during the
period of CR intensity increasing on January 20, 2005, have been obtained
using the method of spectrographic global survey according to the data of
ground-based observations of CR at the world-wide network of stations. It is
shown that in the flare main phase, there was observed a CR strong
anisotropy and the
... More
Presented by Dr. Sergey STARODUBTSEV
on
6/7/2007
at
19:45
Exploration of the galactic and metagalactic objects in which the acceleration of
protons and nuclei is accompanying with generation of gamma-quanta and neutrinos is
of great current interest for astroparticle physics because the gammas and neutrinos
do not dissipate energy after propagation through the magnetic fields of the Universe
providing a unique probe into these cosmic accelerators. Th
... More
Presented by Prof. Vera Georgievna SINITSYNA
on
6/7/2007
at
19:45
A world grid of vertical cosmic ray cutoff rigidities was calculated using the
Definitive International Geomagnetic Reference Field for Epoch 1995.0. These
cutoff rigidity values show the effects of the continued evolution of the
geomagnetic field. The average cutoff values continue to decrease especially in
the South Atlantic and South American areas. However, in some areas of the
wo
... More
Presented by Dr. Don SMART
on
6/7/2007
at
19:45
A world grid of vertical cosmic ray cutoff rigidities was calculated using the
Definitive International Geomagnetic Reference Field for Epoch 2000.0. These
cutoff rigidity values were specifically computed for updating the aircraft
radiation dose. These cutoff rigidity values show the effects of the continued
evolution of the geomagnetic field. The average cutoff values continue to
de
... More
Presented by Dr. Don SMART
on
6/7/2007
at
19:45
(1) N.N. Volodichev, O.Yu. Nechaev, E.A. Sigaeva.
(2) V.P. Antonova, S.V. Kryukov.
(3) A.P. Chubenko, A.L. Shepetov.
(1) Skobeltsyn Institute of Physics MSU, Moscow, Russia.
(2) Institute of Ionosphere, Almaty, Kazakhstan.
(3) Lebedev Physical Institute Russian Academy of Science, Moscow, Russia.
The results of measurments of a flow of thermal neutrons for 1986-1997 years
on Pamir,
... More
Presented by Dr. Nikolai VOLODICHEV
