3-11 July 2007
Merida, Mexico
Mexico/General timezone
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Contribution List

Displaying 1049 contributions out of 1049
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 120 (6B)
Recent discoveries in gamma ray astronomy at a few 100GeV provide many motivations for extending our coverage of the gamma ray sky to higher energies, up to several 100TeV. After reviewing these motivations we will present simulation-based considerations to drive the design of arrays of Atmospheric Cherenkov telescopes to obtain relevant sensitivity from a few TeV to a few 100TeV.
Presented by Dr. Stephan LEBOHEC, Dr. Pierre COLIN on 9 Jul 2007 at 14:45
Type: Poster Session: Posters 2 + Coffee
Track: HE.1.5 Board #: 006 (1A)
The proposal of a new 4th generation of the Front-End with the advanced 1st level triggers for the Infill Array of the Pierre Auger Observatory and for the Auger North is described. Newest FPGA chips offer much higher capacity of logic registers and memories, as well as DSP blocks. The calibration channel, previously supported by an external dual-port RAM, has been fully implemented into ... More
Presented by Dr. Zbigniew SZADKOWSKI on 6 Jul 2007 at 14:45
Type: Oral Session: OG 2.2
Track: OG.2.2
The Cygnus arm of the galaxy contains a large number of energetic astrophysical sources, including numerous supernova remnants (SNRs), pulsar wind nebulae (PWN) and X-ray binary systems. Indeed, in terms of potential galactic sources needed to explain the origin of the high energy cosmic rays, Cygnus is the promising region accessible to northern hemisphere observatories using the air s ... More
Presented by Prof. Rene ONG on 4 Jul 2007 at 10:54
Type: Poster Session: Posters 2 + Coffee
Track: HE.1.5 Board #: 005 (1A)
Hadron induced, very inclined EAS, starting their development early in the atmosphere produce narrow, relatively flat muonic fronts on the Pierre Auger detection level. The signatures of FADC traces (very short rise time with fast exponential attenuation) from water Cherenkov tanks can be used for their detection. Currently used triggers in the Pierre Auger surface detector (Threshold an ... More
Presented by Dr. Zbigniew SZADKOWSKI on 6 Jul 2007 at 14:45
Type: Poster Session: Posters 1 + Coffee
Track: SH.2.4 Board #: 180 (9B)
Based on a large series (N=14038) of daily solar-wind densities, we obtained the fluctuation power spectrum. The spectrum shows that the 399-day variation (the synodic period of Jupiter) has the largest amplitude in the interval of periods from 20 to 800 day. It is second in magnitude only to the secular, 22- ,and 11-year variations. The amplitudes of the 399-day variations in solar-wind ... More
Presented by Dr. Vladislav TIMOFEEV on 4 Jul 2007 at 14:45
Type: Poster Session: Posters 2 + Coffee
Track: HE.1.5 Board #: 020 (1B)
A method to reconstruct the 3-dimensional structure of extensive air showers, seen by fluorescence detectors, is described. The observation of the shower is done in 2-dimensional pixels, for consecutive time bins. Time corresponds to a third dimension. Assuming that the cosmic ray shower propagates as a plane wave front moving at the speed of light, a complex 3D volume in space can be ass ... More
Presented by Prof. Mario PIMENTA, Dr. Sofia ANDRINGA on 6 Jul 2007 at 14:45
Type: Poster Session: Posters 1 + Coffee
Track: OG.1.5 Board #: 136 (7A)
A proximity focusing Cherenkov imager called CHERCAM (CHERenkov CAMera) has been added to the Cosmic Ray Energetics and Mass (CREAM) instrument for its forthcoming balloon flight in Antarctica. The detector is optimized for charge measurements with nearly constant resolution over the range of nuclear charge between Z = 1 and about 26 (Fe). The Cherenkov radiator is a 108 x108 cm2 plane of two ... More
Presented by Dr. Michel BUÉNERD on 4 Jul 2007 at 14:45
Type: Poster Session: Posters 3 + Coffee
Track: SH.3.2 Board #: 194 (10A)
We study the dependence of the exponent of the power law rigidity spectrum of the galactic cosmic ray (GCR) intensity variations on the range of the GCR particles rigidity using data of neutron monitors and ground meson telescopes. We found that the rigidity spectrum of the GCR intensity variations is hard for neutron monitors with the effective rigidities ~10-15GV and soft for neutron m ... More
Presented by Dr. Krzysztof ISKRA, Prof. Michael ALANIA on 9 Jul 2007 at 14:45
Type: Oral Session: OG 1.5
Track: OG.1.5
A design concept for a future ground-based cosmic-ray observatory using the Direct Cerenkov technique will be presented. This technique can provide high precision, largely model-independent, measurements of the energy and charge of heavy cosmic-ray primaries in the region of the knee. It does so by exploiting the direct component of Cerenkov radiation emitted by these primaries prior to thei ... More
Presented by Prof. Scott WAKELY on 6 Jul 2007 at 13:05
Type: Poster Session: Posters 2 + Coffee
Track: HE.1.5 Board #: 071 (4A)
A Fabry-Perot interferometer prototype is studied, as part of a Doppler LIDAR (DL) receiver, for determining the aerosol to molecular scattering ratio for use in EAS Fluorescence Detectors. The etalon of this instrument has a Free Spectral Range of 0.1 cm[-1] and resolution in wavenumber 0.04 cm[-1] . Possible additional use of the proposed DL receiver can be as a spectrally selective d ... More
Presented by Mr. Emmanuel FOKITIS on 6 Jul 2007 at 14:45
Type: Poster Session: Posters 2 + Coffee
Track: HE.1.6 Board #: 015 (1B)
As described in an accompanying paper (kasahara), full M.C simulation of air showers in the GZK region is possible by a distributed-parallel processing method. However, this still needs a long computation time even with ~50 to ~100 cpu's which may be available in many pc cluster environments. Air showers always fluctuate event to event largely, and only 1 or few events are not app ... More
Presented by Prof. katsuaki kasahara KASAHARA on 6 Jul 2007 at 14:45
Type: Poster Session: Posters 2 + Coffee
Track: HE.1.6 Board #: 031 (2A)
Analysis of various data accumulated in X-ray emulsion chamber experiments, especially, data on gamma-ray–hadron families with unusual characteristics (Centauros, aligned events etc.), requires a comprehensive program to simulate the propagation of electromagnetic and various-type hadron particles through sandwich-like media of emulsion chambers as well as measuring procedures used for emul ... More
Presented by Prof. Rauf MUKHAMEDSHIN on 6 Jul 2007 at 14:45
Type: Poster Session: Posters 2 + Coffee
Track: HE.1.5 Board #: 051 (3A)
Some aspects of the cosmic ray astronomy require the access and the processing of the data in the shortest possible time. We implemented a data files moving system , based on GRID tools and services, to automatically transfer the files from the high altitude ARGO-Yangbajing Laboratory in Tibet to the Storage Elements at the processing sites in IHEP-Beijing (China) and CNAF- Bologna (Italy ... More
Presented by Cristian STANESCU on 6 Jul 2007 at 14:45
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 100 (5B)
Geant4 is a Monte Carlo radiation transport toolkit of generalized application in areas such as high-energy physics, nuclear physics, astroparticle physics, or medical physics. Geant4 provides an optical physics process category, allowing the simulation of the production and propagation of light. Such capabilities are well tailored for the simulation of optics systems namely in cosmic-rays e ... More
Presented by Dr. Bernardo TOMÉ on 9 Jul 2007 at 14:45
Type: Poster Session: Posters 3 + Coffee
Track: SH.3.4 Board #: 185 (9B)
Here we present the results of a harmonic analysis of the large scale cosmic ray anisotropy as observed by the Milagro observatory. The Milagro observatory is a water Cherenkov detector located in the Jemez mountains outside of Los Alamos, New Mexico. With a high duty cycle and large field-of-view, Milagro is an excellent instrument for measuring this anisotropy with high sensitivity at TeV e ... More
Presented by Mr. Brian KOLTERMAN on 9 Jul 2007 at 14:45
Type: Poster Session: Posters 1 + Coffee
Track: OG.1.5 Board #: 143 (7B)
The Track Imaging Cerenkov Experiment (TrICE) is an air Cerenkov telescope designed to use multi-anode photomultipliers to achieve a high angular resolution for measuring cosmic-ray composition at TeV-PeV energies. The TrICE camera, composed of 16 Hamamatsu R8900 16-channel multi-anode photomultiplier tubes achieves 0.086 degree pixel spacing over 1.5 degree field of view. We present ... More
Presented by Dr. Karen BYRUM on 4 Jul 2007 at 14:45
Type: Poster Session: Posters 2 + Coffee
Track: HE.1.5 Board #: 066 (4A)
A LED flasher has been developed for TUNKA-133 EAS Cherenkov detector. Blue ultra bright InGaN LED is used as a light source in the flasher. The flasher's driver based on a complementary pair of fast RF transistors. The light yield of the flasher is adjusted in a wide range from 0 to upt to 10**9 photons per pulse. The results of studies of the flasher's amplitude and timing parameters a ... More
Presented by Mr. Bator SHAIBONOV on 6 Jul 2007 at 14:45
Type: Poster Session: Posters 2 + Coffee
Track: HE.1.5 Board #: 056 (3B)
The energy of the primary cosmic ray can be calculated from fluorescence photons detected by fluorescence telescope. However, since we can not know the true energy of primary cosmic ray, it is difficult to calibrate between number of photons and energy directly. In TA project, we will create pseudo- cosmic ray events by using accelerated electron beam which is injected in the air. The injecte ... More
Presented by Tatsunobu SHIBATA on 6 Jul 2007 at 14:45
Type: Oral Session: SH 1.8
Track: SH.1.8
Ground Level Enhancements (GLE) are more likely to occur when the Sun is very active. The most recent GLE was a maverick. It occurred near solar minimum, but it was a large event by historical standards, with a peak increase exceeding 100% at some stations. This talk reports initial observations and modeling of the GLE of December 13, 2006 based on data returned by the “Spaceship Earth ... More
Presented by Prof. John BIEBER on 6 Jul 2007 at 12:05
Type: Oral Session: HE 2.4
Track: HE.2.4
High energetic neutrinos coming from space can interact either in the atmosphere or in the Earth. In the first scenario neutrino may initiate extensive air showers (EAS) in the atmosphere, but due to their very small interaction cross section in air only very inclined EAS might be detectable by large detectors. In the second scenario neutrino may interact inside the Earth and prod ... More
Presented by Dr. Dariusz GORA on 10 Jul 2007 at 12:17
Type: Poster Session: Posters 2 + Coffee
Track: HE.1.6 Board #: 003 (1A)
In an air shower induced by a cosmic ray, due to the high velocities, most of the particles are concentrated in the relatively thin shower front, which, for obvious reasons, is called the 'pancake'. This pancake, which for the present discussion is assumed to be charge neutral, contains large numbers of electrons and positrons. It has a typical thickness of a few meters and is moving to the s ... More
Presented by Olaf SCHOLTEN on 6 Jul 2007 at 14:45
Type: Oral Session: HE 1.4.A
Track: HE.1.4.A
Ultra High Energy Cosmic Rays (UHECRs) have an energy many times greater than that of particles accelerated in colliders. The Extended Air Showers (EAS) resulting from their interaction in the atmosphere give us the opportunity to study not only Cosmic Rays but also these extremely energetic cascades. A method to calculate the Average Longitudinal Shower profile has been applied to the Hig ... More
Presented by Mr. Gareth HUGHES on 4 Jul 2007 at 09:42
Type: Poster Session: Posters 2 + Coffee
Track: OG.2.1 Board #: 141 (7B)
The diffuse extragalactic gamma-ray background (EGRB) has been derived by various groups from observations by the EGRET instrument on CGRO. The derived EGRB consists of gamma-rays that may come from true astrophysical components, such as from unresolved extragalactic point sources (blazars, normal galaxies, etc.) and truly diffuse signals from the Galaxy and inverse Compton scattering on the s ... More
Presented by Dr. Troy PORTER on 6 Jul 2007 at 14:45
Type: Poster Session: Posters 1 + Coffee
Track: OG.1.5 Board #: 095 (5B)
The first phase experiment of the Tibet hybrid experiment to measure the energy spectrum of the light components (proton and helium) strongly suggested that the knee region should be dominated by heavy components. A new type of air shower core detector Tibet-YAC (Yangbajing Air shower Core detector) as well as Tibet-MD (a large underground muon detector array) are being planned. In this paper, ... More
Presented by Dr. Jing HUANG on 4 Jul 2007 at 14:45
Type: Poster Session: Posters 2 + Coffee
Track: OG.2.1 Board #: 161 (8B)
The EGRET experiment onboard the Compton Gamma-ray Observatory have provided the most precise measurements of the gamma-ray sky to date. EGRET measurements of diffuse emission across the sky show an excess above 1 GeV. This “GeV excess” has been a topic of great debate and interest since its original discovery by Hunter et al. in 1997. We have modified the GLAST simulation and recons ... More
Presented by Prof. Robert JOHNSON on 6 Jul 2007 at 14:45
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 119 (6B)
Milagro is a TeV gamma-ray detector that utilizes a large water Cherenkov detector to observe extensive air showers produced by high energy particles impacting the Earth's atmosphere. Milagro's distinct advantage compared to other TeV gamma-ray detectors is that it views a wide field (2 steradian over-head sky) and it continuously operates (>90% live time). A new background rejection techniq ... More
Presented by Dr. Aous ABDO on 9 Jul 2007 at 14:45
Type: Poster Session: Posters 2 + Coffee
Track: HE.1.6 Board #: 014 (1B)
We developed a new parallel processing method enabling full M.C EAS simulation (say, with minimum energy of 500 keV) without using thin sampling even at 10^19 eV. Normally, distributed-parallel processing needs a specific software and programs must be organized to match with such system. During the computation such a scheme also requires complex communications among many computer hosts ... More
Presented by Prof. katsuaki kasahara KASAHARA on 6 Jul 2007 at 14:45
Type: Oral Session: OG 1.2
Track: OG.1.2
Referring to the observed data in the depletions of elements in the interstellar clouds, the chemical composition of dust grains has been deduced, though it is highly variable among these clouds. This variability seems to reflect upon the place where such dust grains are formed inside these clouds. Deep inside the clouds, the chemical composition of dust grains is well coincident with that of ... More
Presented by Dr. Kunitomo SAKURAI on 4 Jul 2007 at 12:53
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 134 (7A)
A probability density method for VHE gamma-ray source analysis, applicable to both stand alone IAC telescopes and stereoscopic arrays, is presented here. Developed using simulations and Crab data for the Whipple 10m telescope, the technique covers both two-dimensional image and spectral analyses, and background subtraction is implemented either by a modified standard approach using cuts on Hil ... More
Presented by Ms. Alex SYSON on 9 Jul 2007 at 14:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.5 Board #: 006 (1A)
Detection of radiopulses from moon's surface employing moon based as well as earth based detectors was proposed about several decades back. Inspired by this novel idea a good number of experimental groups have been continuing such investigations. In this paper a moon based experimental set up for receiving lunar radiopulses and then transmitting the same to earth based or satellite base ... More
Presented by Ms. Kalpana ROY SINHA on 9 Jul 2007 at 14:45
Type: Oral Session: OG 2.1, OG 2.2
Track: OG.2.1
We searched for gamma-ray sources in the EGRET data from cycle 1 to cycle 9. We used a 2D maximum likelihood method similar to that developed for the Egret 3EG catalog. Two interstellar background models, due to cosmic-ray interactions in the Milky Way, were used: a model where the most recent HI, CO, and inverse Compton maps were linearly fitted to the EGRET gamma rays and a model obtained fr ... More
Presented by Mr. Jean-Marc CASANDJIAN on 4 Jul 2007 at 08:30
Type: Oral Session: OG 2.3, 2.4
Track: OG.2.4
Gamma-ray bursts (GRBs) have been detected up to GeV energies and are predicted by many models to emit in the very high energy (VHE, >100 GeV) regime too. Detection of such emission would allow us to constrain GRB models. Since its launch, in late 2004, the Swift satellite has been locating GRBs at a rate of approximately 100 per year. The rapid localization and follow-up in many wavelengths ... More
Presented by Dr. Brenda DINGUS on 10 Jul 2007 at 09:30
Type: Poster Session: Posters 2 + Coffee
Track: OG.2.2 Board #: 127 (7A)
The Vela Supernova remnant is a large, nearby remnant with a complex morphology, containing a bright pulsar at its centre. This pulsar has an associated pulsar wind nebula (PWN), gamma-ray emission from which was detected by the H.E.S.S. collaboration at very high energies. As the Vela remnant is the closest known PWN to us, detailed study of the spectral and morphological characteristics of t ... More
Presented by Dr. Bruno KHELIFI on 6 Jul 2007 at 14:45
Type: Poster Session: Posters 3 + Coffee
Track: SH.3.2 Board #: 202 (10B)
We have investigated a solar activity dependence of a solar wind (SW) effect on cosmic ray intensity (CRI) variations. The SW effect discussed here is not concerned with transient origins such as Forbush decreases nor with known solar modulations. The effect is represented by the regression coefficient of CRI variations with SW velocities. CRI data we used have been recorded by the neutron m ... More
Presented by Prof. Hiroshi KOJIMA on 9 Jul 2007 at 14:45
Type: Oral Session: OG 2.3, OG 2.4
Track: OG.2.3
A spectacular outburst of VHE (>100 GeV) gamma-ray emission was observed from PKS 2155-304 in 2006 with the H.E.S.S. experiment. The VHE flux reached levels of ~20 times the Crab Nebula flux, more that 2 orders of magnitude above typical values observed from the object. This extremely high flux, when coupled with the sensitivity of H.E.S.S., enables temporal studies of the emission wit ... More
Presented by Dr. Wystan BENBOW on 6 Jul 2007 at 12:17
Type: Oral Session: SH 2.1
Track: SH.2.1
Interplanetary coronal mass ejections, the interplanetary counterparts of coronal mass ejections at the Sun, are the major drivers of interplanetary shocks in the heliosphere, and are associated with modulations of the galactic cosmic ray intensity, both short term (Forbush decreases caused by the passage of the shock, post-shock sheath, and ICME) and possibly with longer term modulation. Usi ... More
Presented by Dr. Hilary CANE on 5 Jul 2007 at 12:41
Type: Poster Session: Posters 2 + Coffee
Track: OG.2.2 Board #: 135 (7A)
Milagro is a TeV gamma-ray observatory with a ~2 sr field of view and a >90% duty factor. A recent survey at 12 TeV of the Galactic Plane by Milagro has discovered three new sources, along with four promising source candidates. Each of the new sources and most of the candidates have likely counterparts in the EGRET GeV catalog, some of which are possibly associated with pulsar wind nebulae ( ... More
Presented by Gary WALKER on 6 Jul 2007 at 14:45
Type: Poster Session: Posters 2 + Coffee
Track: OG.2.2 Board #: 115 (6A)
Since the discovery of TeV emission from the LS 5039/RX J1826.2-1450 binary system, microquasars are an established class of Very High Energy gamma-ray sources. Nonetheless, the current catalog of gamma-ray binaries remains somewhat limited, with only three examples known. We present the results of a systematic search for TeV emission from known X-ray binaries with similar properties to LS 5 ... More
Presented by Mr. Hugh DICKINSON on 6 Jul 2007 at 14:45
Type: Poster Session: Posters 2 + Coffee
Track: HE.1.5 Board #: 054 (3B)
The existing imaging air Cherenkov Telescopes (IACT) are using imaging cameras of aperture 2-4 degrees. These telescopes have F/0.7 to F/1.2 optics. The best optical resolution that one can obtain with these optical designs is in the range of 3 minutes of arc, and that only in the central region of the imaging camera. There are indications from simulations that one can further improve th ... More
Presented by Dr. Razmick MIRZOYAN on 6 Jul 2007 at 14:45
Type: Oral Session: HE 3.3
Track: HE.3.3
We discuss the general observational upper limits on the total annihilation rate of dark matter derived from the diffuse gamma ray background measured by the EGRET satellitr. We assume that the dark matter annihilates at tree level in the least detectable final states in the Standard Model, namely neutrinos. Any other decay channel would lead to stronger constraints. Electroweak jet cascading ... More
Presented by Dr. Pasquale Dario SERPICO on 10 Jul 2007 at 08:54
Type: Poster Session: Posters 1 + Coffee
Track: HE.1.3.A Board #: 038 (2B)
The KASCADE-Grande experiment at Forschungszentrum Karlsruhe, Germany, measures extensive air showers initiated by primary particles with energies between 100 TeV and 1 EeV. Detector pulses digitized by a Flash-ADC based data acquisition system were unfolded to study the arrival times of secondary particles separately for the electromagnetic and the muonic shower component. Muons arrive on av ... More
Presented by Dr. Paul DOLL on 4 Jul 2007 at 14:45
Type: Poster Session: Posters 2 + Coffee
Track: OG.2.2 Board #: 133 (7A)
Deconvolution algorithms have been used successfully for optimization/restoration/deblurring of astronomical images in a variety of wavelengths, especially in the optical band (e.g., for HST). We present here an iterative Richardson-Lucy type method designed for treatment of images obtained with the High Energy Stereoscopy System (H.E.S.S.) array of ground- based gamma-ray telescopes. Its ... More
Presented by Dr. Gilles MAURIN on 6 Jul 2007 at 14:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.5 Board #: 018 (1B)
For the design of an optical module for deep-sea cubic kilometre sized neutrino telescopes it is important to optimise performance versus cost. In the framework of the KM3NeT design study we have designed an optical module consisting of a single glass pressure vessel and containing up to about 40 small photomultiplier tubes 40 small photomultiplier tubes including their high-voltage supp ... More
Presented by Prof. PAUL KOOIJMAN on 9 Jul 2007 at 14:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.3.3 Board #: 054 (3B)
In the standard model of cosmic structure formation, dark matter haloes form by gravitational instability. The process is hierarchical: smaller systems collapse earlier, and later merge to form larger halos. The probability that a halo of mass m at redshift z will be part of a larger halo of mass M at the present time is described by the progenitor (conditional) mass function f(m,z|M,0), accor ... More
Presented by Dr. Lidia PIERI on 9 Jul 2007 at 14:45
Type: Poster Session: Posters 2 + Coffee
Track: OG.2.3 Board #: 090 (5A)
Since 2002, the number of detected blazars at gamma-ray energies of 100 GeV and above has more than doubled. A synoptic study of these objects therefore might reveal important collective characteristics. I present a study of all currently known high-frequency peaked BL Lac-type objects for which photon energy spectra at E>100 GeV have been inferred. The intrinsic energy spectra of the sources ... More
Presented by Dr. Robert WAGNER on 6 Jul 2007 at 14:45
Type: Oral Session: OG 1.4+2.2
Track: OG.1.4
We present the results of a kinetic calculation of the growth rates of non resonant modes excited by streaming cosmic rays in non-relativistic shock waves. We show how different assumptions for the compensating current lead to the appearance of different modes with different growth rates. We discuss the conditions under which the modes are non resonant (a la Bell) and lead to large growth rat ... More
Presented by Dr. Pasquale BLASI on 7 Jul 2007 at 08:30
Type: Oral Session: SH 1.8
Track: SH.1.8
To determine the characteristics of galactic and solar cosmic ray flux near Earth by using neutron monitor measurements, the observation data are usually submitted to analysis procedures involving extensive calculations and expert knowledge. For space weather applications an equally valid method is desirable that is straightforward, fast, and simple, to allow quasi-automatic data analysis ... More
Presented by Prof. Erwin O. FLUECKIGER on 6 Jul 2007 at 11:42
Type: Poster Session: Posters 2 + Coffee
Track: OG.2.3 Board #: 085 (5A)
Observations of the Coma cluster by Beppo-SAX have shown a hard X-ray excess in the spectrum that could be interpreted as the presence of a particle acceleration site. However, given that the hard X-ray instrument on board Beppo-SAX was non-imaging, existence of point sources could change this interpretation. The better angular resolution of INTEGRAL allowed us to analyze the morphology of the ... More
Presented by Mr. Dominique ECKERT on 6 Jul 2007 at 14:45
Type: Poster Session: Posters 2 + Coffee
Track: HE.1.5 Board #: 038 (2B)
We have designed and built a programmable hardware module for TTL pulse generation and capture in absolute time. The time reference is an on-board GPS (Global Positioning System) receiver. Tests of a prototype performed at the US National Institute of Standards (NIST) found a nominal accuracy better than 20 ns relative to the secondary US frequency standard. Potential applications for this ... More
Presented by Mr. Jeremy SMITH, Mr. Jason THOMAS, Mr. Stan THOMAS, Prof. Lawrence WIENCKE on 6 Jul 2007 at 14:45
Type: Oral Session: HE 1.5
Track: HE.1.5
The IceCube neutrino detector is built into the Antarctic ice sheet at the South Pole to measure high energy neutrinos. For this, 4800 PMTs are being deployed at depths between 1,450 and 2,450 meters into the ice to measure neutrino induced charged particles like muons. IceTop is a surface air shower detector consisting of 160 Cherenkov ice tanks located on top of IceCube. To extend IceTop, ... More
Presented by Dr. Timo KARG on 10 Jul 2007 at 12:53
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.5 Board #: 019 (1B)
The readout of optical modules for deep-sea kilometre sized neutrino telescopes is challenging for many reasons. Power consumption of the electronics placed at the bottom of the sea must be low, and the data have to be transported to shore over distances up to possibly 100 km. We present a novel readout system - developed in the framework of the KM3NeT design study - where the data from ... More
Presented by Prof. PAUL KOOIJMAN on 9 Jul 2007 at 14:45
Type: Poster Session: Posters 2 + Coffee
Track: OG.2.2 Board #: 101 (5B)
Stimulated by the recent HESS galactic survey which discovered 14 new TeV gamma-ray sources, it is now important to measure 100 TeV gamma rays from celetial sources to locate possible cosmic-ray accelerators up to PeV energies in our galaxy. The Tibet air shower array (37,000m**2), located at 4,300 m above sea levelin Tibet, is a wide field-of-view gamma-ray telescope above TeV energie ... More
Presented by Dr. Masato TAKITA on 6 Jul 2007 at 14:45
Type: Poster Session: Posters 2 + Coffee
Track: OG.2.3 Board #: 116 (6B)
Jets of Active Galactic Nuclei (AGN) are established emitters of Very High Energy (VHE; >100 GeV) gamma rays. In addition, VHE radiation is expected to be emitted from the vicinity of Supermassive Black Holes (SMBH) irrespective of their activity state. Accreting SMBH rotate and generate a dipolar magnetic field. In the magnetosphere of the spinning black hole acceleration of particles can ta ... More
Presented by Ms. Giovanna PEDALETTI on 6 Jul 2007 at 14:45
Type: Poster Session: Posters 2 + Coffee
Track: OG.2.2 Board #: 113 (6A)
Utilising the unprecedented TeV sky coverage of the H.E.S.S. galactic plane scan, we present the results of a search for Very High Energy gamma-ray sources coincident with the positions of known X-ray binaries. Although no significant detections were obtained, upper limits to the TeV flux from 36 microquasars and X-ray binaries were derived.
Presented by Mr. Hugh DICKINSON on 6 Jul 2007 at 14:45
Type: Oral Session: HE 1.4.A
Track: HE.1.4.A
There are some prerequisites to possible success in searching for small-scale anisotropy of cosmic ray arrival directions at the highest energies. Recent claims of autocorrelations in the data of giant extensive air shower (EAS) arrays and presumable correlations between BL Lacertae and ultra-high energy cosmic rays (UHECRs) incite to sift the Yakutsk array data. Present analysis is based ... More
Presented by Dr. Anatoly IVANOV on 7 Jul 2007 at 13:05
Type: Oral Session: HE 2.3
Track: HE.2.3
Current status and results of the experiment on recording neutrino bursts are presented. The observation livetime (since 1980) is 22.6 years. The upper bound of collapse frequency in our Galaxy is 0.10 $y^{-1}$ (90% CL).
Presented by Dr. Yuriy NOVOSELTSEV on 5 Jul 2007 at 12:46
Type: Oral Session: HE 1.3.A
Track: HE.1.3.A
We present updated results for anisotropy searches in the direction of the Galactic centre at energies in the EeV range. We use data from the Pierre Auger Southern Observatory up to March, 2007. Present analyses are therefore based on a substantially larger data set than our previous published results. The larger statistics from the surface array allow for more precise measurements as a ... More
Presented by Edivaldo SANTOS on 4 Jul 2007 at 12:45
Type: Oral Session: OG 2.5
Track: OG.2.5
Problems in observation of extensive air showers generated by neutrinos are connected with an extremely small cross section of inelastic collisions of neutrinos with nuclei. However, two facts allow to search for showers generated by neutrinos: (1) a hadron cascade with the primary energy of more than 10^13 eV leaves a mountain ridge to the atmosphere from the depth ~ 300g/cm^2 without an esse ... More
Presented by Prof. Vera Georgievna SINITSYNA on 9 Jul 2007 at 12:41
Type: Poster Session: Posters 1 + Coffee
Track: HE.1.4.A Board #: 009 (1A)
A shape of lateral distribution for charged particles in events with energy above 10**19eV is considered. Two methods were used for individual LDF parametrization. In the first approach, the index of power was determined for generalized Greisen-Linsley approximation. In second, mean square radius of the shower was determined for approximation proposed by Lagutin et al. Comparison of resulted p ... More
Presented by Mr. Artem SABOUROV on 4 Jul 2007 at 14:45
Type: Poster Session: Posters 1 + Coffee
Track: OG.1.4 Board #: 118 (6B)
The discovery of direct evidence for the acceleration of high energetic particles at the shell supernova remnant RXJ1713.7-3946 underlined the need to calculate the cosmic ray (CR) distribution in the Galaxy on a spatial grid fine enough to resolve the changes in the CR density due to these kind of objects. It was shown before by Buesching et al 2005 that the discrete nature (both in space and ... More
Presented by Dr. Ingo BUESCHING on 4 Jul 2007 at 14:45
Type: Poster Session: Posters 2 + Coffee
Track: HE.1.5 Board #: 068 (4A)
We address the problem of determining the spectrum of night sky background in a spectral resolution which allows understanding quick changes in the intensity and shape of these spectra. One can use this information in EAS observatories for carrying out possible corrective actions during the testing, designing or normal operation phases. We present a design of a low cost medium resolution ... More
Presented by Mr. Emmanuel FOKITIS on 6 Jul 2007 at 14:45
Type: Oral Session: SH 3.4, SH 3.5
Track: SH.3.4
The propagation of galactic and solar cosmic rays in the solar wind (SW) can be strongly influenced by the SW fluctuations properties. Magnetohydrodynamic (MHD) scale fluctuations in the solar wind are usually highly anisotropic, and have also been found to exhibit different properties in regions of high and low solar wind speed. We analyze here the anisotropy properties of the solar wind f ... More
Presented by Dr. Sergio DASSO on 10 Jul 2007 at 09:18
Type: Oral Session: HE 2.1
Track: HE.2.1
ACORDE (ALICE cosmic ray detector) is one of the ALICE detectors, presently in construction. It will consist of an array of plastic scintillator counters placed on the three upper faces of the magnet. This array will act as the cosmic ray trigger for ALICE calibration, as well as multiple muon trigger to study high energy cosmic rays. ACORDE, together with other ALICE subdetectors, will prov ... More
Presented by Dr. Arturo FERNANDEZ TELLEZ on 5 Jul 2007 at 09:30
Type: Poster Session: Posters 2 + Coffee
Track: HE.1.5 Board #: 083 (4B)
It is planned to up-grade the Pierre Auger Observatory through some enhancements so that the energy spectrum of cosmic rays can be studied down to 0.1 EeV and the muon component of showers can be determined. The former will lead to a spectrum measured by one technique from 0.1 EeV to beyond 100 EeV while the latter will aid identification of the primary particles. These enhancements consist o ... More
Presented by Prof. Alberto ETCHEGOYEN on 6 Jul 2007 at 14:45
Type: Poster Session: Posters 2 + Coffee
Track: OG.2.2 Board #: 094 (5A)
We present for the case of Tycho's supernova remnant the relation between the blast wave and contact discontinuity sizes calculated within the nonlinear kinetic theory of cosmic ray acceleration in SNRs. It is demonstrated that they are very well confirmed by recently published Chandra measurements, which show that the observed contact discontinuity radius is so close to the shock radius, th ... More
Presented by Dr. Leonid KSENOFONTOV on 6 Jul 2007 at 14:45
Type: Oral Session: HE 2.3
Track: HE.2.3
The ANtarctic Impulsive Transient Antenna (ANITA) searches for ultra high energy neutrinos interacting in the antarctic ice cap. It is a long duration balloon experiment composed of an array of broadband dual-polarized horn antennas that had its first science flight over Antarctica in December 2006 through January 2007. ANITA relies upon the Askaryan effect, in which a particle shower in a d ... More
Presented by Kimberly J. PALLADINO on 7 Jul 2007 at 11:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.3 Board #: 026 (2A)
The ANTARES Collaboration is building a high energy neutrino telescope at 2500 m depth in the Mediterranean Sea. The experiment aims to search for high- energy cosmic neutrinos through the detection of Cerenkov light induced by muons and showers resulting from neutrino interactions with the surrounding medium. The detector will consist of a three-dimensional array of 900 optical modules h ... More
Presented by Dr. Yvonne BECHERINI on 9 Jul 2007 at 14:45
Type: Oral Session: HE 2.5
Track: HE.2.5
The ARIANNA concept utilizes the Ross Ice Shelf near the coast of Antarctica to increase the sensitivity to cosmogenic neutrinos by roughly an order of magnitude when compared to the sensitivity of existing detectors and those under construction. Therefore, ARIANNA can test a wide variety of scenarios for GZK neutrino production, and probe for physics beyond the standard model by measuri ... More
Presented by Prof. Steven BARWICK on 7 Jul 2007 at 11:06
Type: Oral Session: HE 1.3.A
Track: HE.1.3.A
The characteristics relating to lateral and longitudinal development of EAS in the energy region of 10**15 - 10**19 eV have been analyzed in the framework of the QGSJET model and of mass composition of primary cosmic rays. It is found that at E0 >= 5x10**15 eV the mean mass composition of primary cosmic rays begins to vary as indicated by a rise of <ln(A)> with increasing energy. The maximum ... More
Presented by Dr. Stanislav KNURENKO on 6 Jul 2007 at 11:10
Type: Poster Session: Posters 2 + Coffee
Track: HE.1.5 Board #: 001 (1A)
The transparency is one of the primary measures of the atmospheric state. The precise long term series of atmospheric transparency measurements gives the possibility for quantitative estimate of the variability of air circulation and to make climatologic conclusions with regard to contamination, cloud formation, humidity and radiative exchange. It seems to be possible to estimate the atmospher ... More
Presented by Dr. alexander MISHEV on 6 Jul 2007 at 14:45
Type: Oral Session: SH 1.3, SH 1.4
Track: SH.1.4
Using instruments on the ACE and Wind spacecraft, we investigate the temporal evolution, spectrum, and ionization states of Solar Energetic Particle (SEP) Fe in the impulsive event of 2000 May 1. Proton and electron intensities and anisotropies were used to help constrain the characteristics of the interplanetary propagation taking account of focusing, pitch-angle scattering, adiabatic decele ... More
Presented by Wolfgang DROEGE on 4 Jul 2007 at 10:54
Type: Poster Session: Posters 1 + Coffee
Track: SH.1.5 Board #: 167 (8B)
Acceleration of charge particles in stochastic electric fields is considered. The fractional symmetric Fokker-Planck equation is derived on the basis of the Langevin equations and with an assumption that the fluctuations of electric fields are subordinated by the Levy stable laws. From the solution of the equation it is showed that an ensemble of charge particles is relaxed to the power ... More
Presented by Mr. Ivan ZIMOVETS on 4 Jul 2007 at 14:45
Type: Poster Session: Posters 1 + Coffee
Track: HE.1.2.B Board #: 035 (2B)
Accuracies of numerical Fourier and Hankel transforms are examined with the Takahasi-Mori theory of error evaluation. The higher Moliere terms both for spatial and projected distributions derived by these methods agree very well with those derived analytically. The methods will be valuable to solve other transport problems concerning fast charged particles.
Presented by Prof. Takao NAKATSUKA on 4 Jul 2007 at 14:45
Type: Poster Session: Posters 2 + Coffee
Track: OG.2.3 Board #: 145 (7B)
Using data derived from the H.E.S.S. telescope system and the LIDAR facility on site, a method of correcting for changing atmospheric quality based on cosmic-ray parameters is presented. The method was applied to data from the active galactic nucleus PKS 2155-304, taken during August and September 2004 when the quality of the atmosphere at the site was highly variable. Corrected and uncorrect ... More
Presented by Dr. Paula CHADWICK on 6 Jul 2007 at 14:45
Type: Oral Session: Opening and Hess Lecture
Presented by Juan Carlos ROMERO-HICKS on 3 Jul 2007 at 16:50
Type: Oral Session: Opening and Hess Lecture
Presented by Simon SWORDY on 3 Jul 2007 at 17:10
Type: Oral Session: Opening and Hess Lecture
Presented by Juan Pedro LACLETTE on 3 Jul 2007 at 16:40
Type: Poster Session: Posters 2 + Coffee
Track: HE.1.5 Board #: 046 (3A)
Extreme Universe Space Observatory on JEM/EF (JEM-EUSO) is a space mission to observe extremely high-energy cosmic rays. JEM-EUSO is a wide-angle refractive telescope in near-ultraviolet wavelength region to observe time- resolved atmospheric fluorescence images of the extensive air showers from the International Space Station. This paper will discuss the optical system of JEM-EUSO. We will r ... More
Presented by Yoshiyuki TAKIZAWA on 6 Jul 2007 at 14:45
Type: Oral Session: HE 1.5
Track: HE.1.5
The fluorescence detection of ultra high energy ($\gtrsim 10^{18}$ eV) cosmic rays requires a detailed knowledge of the fluorescence light emission from nitrogen molecules, which are excited by the cosmic ray shower particles along their path in the atmosphere. We have made a precise measurement of the fluorescence light spectrum excited by MeV electrons in dry air. We measured the relative i ... More
Presented by Dr. Gonzalo RODRIGUEZ FERNANDEZ on 10 Jul 2007 at 11:18
Type: Oral Session: HE 1.1.A
Track: HE.1.1.A
Characteristics of air-showers and accompanied high energy atmospheric families detected in the hybrid experiment at Mt. Chacaltaya are studied in detail and compared with those of simulations taking into accounts the specific detection bias of the experiment. It is shown that the observed characteristics of the atmospheric families accompanied by large air showers, Ne > 10^7, and also those ... More
Presented by Dr. Masanobu TAMADA on 9 Jul 2007 at 08:42
Type: Poster Session: Posters 1 + Coffee
Track: OG.1.1 Board #: 145 (7B)
The Advanced Thin Ionization Calorimeter (ATIC), a balloon-borne experiment, is designed to investigate the composition and energy spectra of cosmic rays of charge Z = 1 to 26 over the energy range ~ 10^11 - ~ 10^14 eV. The instrument consists of a silicon matrix charge detector, plastic scintillator strip hodoscopes interleaved with graphite interaction targets, and an 18 radiation leng ... More
Presented by Dr. Hoseok AHN on 4 Jul 2007 at 14:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.3 Board #: 043 (3A)
Up to now, analyses of AMANDA data have been limited to searches for diffuse astrophysical sources, time- integrated searches for point sources, and searches for flares and bursts from pre-selected sources (AGN and GRB) over limited time-scales. On the other hand, multi-wavelength studies have shown that emissions can occur in exponential flares or bursts with strengths that can be much great ... More
Presented by Dr. Rodín PORRATA on 9 Jul 2007 at 14:45
Type: Oral Session: HE 1.2.A
Track: HE.1.2.A
We present the all-particle primary cosmic ray energy spectrum obtained by a parametric event-by-event determination of the primary energy. The results are obtained on the basis of an expanded experimental data from the GAMMA experiment. The method was developed using the CORSIKA EAS simulation code with the SYBILL interaction model and taking into account the response of the GAMMA detec ... More
Presented by Dr. R.M. MARTIROSOV on 6 Jul 2007 at 08:30
Type: Poster Session: Posters 1 + Coffee
Track: HE.1.4.A Board #: 065 (4A)
The study of the arrival direction of Ultra High Energy Cosmic Rays UHECRs potentially gives us an insight on their origin. In this poster we present a search for event structures in the sky in which the arrival direction of the events lie on a great circle (the arc structure) in High Resolution Fly?s Eye (HiRes). The arc structure is expected when charged cosmic rays get deflected while pa ... More
Presented by Prof. Charlie JUI on 4 Jul 2007 at 14:45
Type: Oral Session: OG 2.1, OG 2.2
Track: OG.2.1
Milagro is a TeV gamma-ray observatory with a ~2 sr field of view and a >90% duty factor. The large field of view and long observation time make Milagro ideal for surveying large regions of the Northern Hemisphere sky. A previous all-sky survey searched for point sources (Atkins, R, et al., 2004, ApJ, 608, 680-685), but the analysis is easily adaptable to look for intermediate-scale (~10 deg ... More
Presented by Gary WALKER on 4 Jul 2007 at 09:30
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.2 Board #: 012 (1B)
We analyze the muon-like Events(single ring image ) in the Super-Kamiokande (SK) by the Computer Numerical Experiment. Assuming the parameters of the neutrino oscillation obtained by the SK which characterize the type of the neutrino oscillation, we reproduce the zenith angle distribution of the muon-like events and compare it with the real distribution obtained by the SK . Also, we car ... More
Presented by Prof. Eiichi KONISHI on 9 Jul 2007 at 14:45
Type: Poster Session: Posters 1 + Coffee
Track: HE.1.4.A Board #: 064 (4A)
Measuring the cosmic gamma ray flux at super-GZK energies is of significance in both interpreting the GZK effect and putting constraints on exotic models of the origin of ultrahigh energy cosmic rays. At these energies, gamma ray primaries interact with the earth's magnetic field before they enter the atmosphere. We have developed a simulation of gamma ray preshowers to study their effect on t ... More
Presented by Mr. Andrew O'NEILL on 4 Jul 2007 at 14:45
Type: Oral Session: HE 2.3
Track: HE.2.3
Air-fluorescence detectors such as the High Resolution Fly's Eye (HiRes) instrument are very sensitive to upward-going, Earth-skimming ultrahigh energy electron-neutrino-induced showers. This is due to the relatively large interaction cross sections of these high-energy neutrinos and the Landau-Pomeranchuk-Migdal (LPM) effect, which is responsible for a significant decrease in the cross secti ... More
Presented by Dr. Lauren SCOTT on 5 Jul 2007 at 12:24
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 107 (6A)
VERITAS employs a 12m segmented mirror and pixellated photomultiplier tube camera to detect the brief pulse of Cherenkov radiation produced by the extensive air shower initiated by a cosmic high-energy gamma ray. The VERITAS data acquisition system consists of a 500 Mega-Sample-Per-Second custom-built flash ADC system, which samples the Cherenkov light pulse every 2 nanoseconds. The integrate ... More
Presented by Dr. Peter COGAN on 9 Jul 2007 at 14:45
Type: Poster Session: Posters 1 + Coffee
Track: OG.1.2 Board #: 096 (5B)
For the chemical composition in the "knee" energy region, we observe air shower core with hybrid detectors in Tibet, Yangbajin(4,300 m a.s.l.). We use the Tibet III air-shower array for the determination of the primary energy and the burst detector for the measurement of the energy flow of air shower core. Previous phase of our experiment used emulsion chamber(X-ray films and nuclear emuls ... More
Presented by Mr. Tatsumi OUCHI on 4 Jul 2007 at 14:45
Type: Oral Session: SH 1.8
Track: SH.1.8
Observations of the Ground Level Enhancement (GLE) of 20 January 2005 are used to investigate a commonly observed, but poorly understood feature of this class of event. The Sanae neutron monitor observed three distinct peaks during this event. The observations were augmented by a neutron moderated detector, from which we could determine that the first, ephemeral peak had a harder spectrum tha ... More
Presented by Prof. Harm MORAAL on 6 Jul 2007 at 12:29
Type: Poster Session: Posters 1 + Coffee
Track: HE.1.4.A Board #: 033 (2B)
The arrival directions of ultrahigh energy extensive air showers by the Yakutsk and AGASA array data have been considered. It is shown that 3 very high ultrahigh energy showers with E>10^20 eV registered at the Yakutsk array correlate with the nearest pulsars. The problem of cosmic ray origin is discussed.
Presented by Dr. Alexei MIKHAILOV on 4 Jul 2007 at 14:45
Type: Poster Session: Posters 1 + Coffee
Track: HE.1.1.A Board #: 071 (4A)
We analyze arrival time of air shower using Hirosaki AS Arrays. This array consists of 5 scintillation detectors with GPS antenna for arrival times. We use Erlang Distribution. The number of air showers observed within short time windows is analized by using arrival time difference of k-events serial air showers. We report the results of the analysis.
Presented by Prof. Nobusuke TAKAHASHI on 4 Jul 2007 at 14:45
Type: Poster Session: Posters 1 + Coffee
Track: SH.1.7 Board #: 200 (10B)
Expansion speed for limb CMEs has been shown to be a good approximation to determine the radial speed. In this work we present an analytical model to obtain from lateral expansion the radial propagation speed of CMEs. We found that the relation between expansion and lateral speeds depends as well on the angular width. We compare the results of the analytical model with the parameters of limb C ... More
Presented by Ms. Guadalupe MUÑOZ MARTÍNEZ on 4 Jul 2007 at 14:45
Type: Poster Session: Posters 1 + Coffee
Track: HE.1.2.B Board #: 034 (2B)
General higher terms of Moliere series are solved analytically, in Moliere- Heisenberg definite integral and/or Goldstein series. The terms of higher orders up to n=6 are practically obtained. Applicable region of Moliere series is extended to shorter depths of penetration down to B=5 by the results.
Presented by Prof. Takao NAKATSUKA on 4 Jul 2007 at 14:45
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 140 (7B)
The GRAPES-3 experiment observes extensive air showers using a high-density array of scintillators and a large area tracking muon detector. The array consists of 300 scintillation detectors (each 1m^2 in area) and 16 modules of muon detectors having a total area of 560m^2. Good angular resolution of the array is a key requirement for detection of point sources of gamma rays. For this purpose w ... More
Presented by Mr. Akitoshi OSHIMA on 9 Jul 2007 at 14:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.3.1 Board #: 028 (2A)
The striking alignment effect detected earlier in gamma-hadron stratospheric STRANA superfamily is supplemented here by analysis of the arrangement of all particles in the central area of the family. It showed the evident anisotropy in the lateral distribution of these particles confirming a coplanar scatter effect in the interaction.
Presented by Dr. Vladislav OSEDLO on 9 Jul 2007 at 14:45
Type: Oral Session: SH 5.3
Track: SH.5.3
The subsonic heliosheath beyond the termination shock (TS) of the solar wind plays a profound role in the transport of anomalous (ACR) and galactic cosmic rays (GCR). The energetic particle observations of Voyager-1, after crossing the TS in December 2004, indicate that the distribution of ACR is not uniform in the heliosheath. We point out that our concepts based on a simple 1-D shock canno ... More
Presented by Dr. Jozsef KOTA on 10 Jul 2007 at 12:41
Type: Oral Session: HE 3.3
Track: HE.3.3
The General Antiparticle Spectrometer (GAPS) exploits low energy antideuterons produced in neutralino-neutralino annihilations as an indirect dark matter (DM) signature that is effectively free from background. When an antiparticle is captured by a target material, it forms exotic atom in an excited state which quickly decays by emitting X-rays of precisely defined energy and a correlated pio ... More
Presented by Dr. Jason E KOGLIN on 10 Jul 2007 at 11:30
Type: Oral Session: HE 3.3
Track: HE.3.3
We calculate the antideuteron flux expected from dark matter annihilation in the galactic halo. The propagation is treated in a full 2-D propagation model consistent with the results obtained from the propagation of B/C and other galactic species. We discuss the potentials of this indirect dark matter detection means and evaluate the possible sources of uncertainties affecting future measur ... More
Presented by Dr. Fiorenza DONATO on 10 Jul 2007 at 10:30
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 099 (5B)
The atmosphere is a vital component of the detector in an atmospheric Cherenkov telescope. In order to understand observations from these instruments and reduce systematic uncertainties and biases in their data it is important to correctly model the atmosphere in simulations of the extensive air showers they detect. The Very High Energy Telescope Array (VERITAS) is a system of 4 such telesco ... More
Presented by Dr. Michael DANIEL on 9 Jul 2007 at 14:45
Type: Poster Session: Posters 2 + Coffee
Track: SH.1.8 Board #: 211 (11A)
A new significant ground level enhancement was recorded by the worldwide neutron monitor network during the minimum phase of the 23rd solar cycle, on 13 December, 2006. The event, also known as GLE70, started at ~ 2:48 UT, whereas the neutron monitor flux in most stations reached its maximum in ~3:00-3:10 UT. In northern Europe the event was registered with big amplitudes that in some c ... More
Presented by Dr. Eugenia EROSHENKO on 6 Jul 2007 at 14:45
Type: Oral Session: HE 1.6
Track: HE.1.6
Air shower universality states that the electromagnetic part of hadron-induced EAS can be completely described in terms of the primary energy and shower age. In addition, simulations show that the muon part is well characterized by an overall normalization which depends on the primary particle and hadronic interaction model. We investigate the consequences of EAS universality for ground ar ... More
Presented by Mr. Fabian SCHMIDT on 5 Jul 2007 at 11:06
Type: Oral Session: HE 1.4.B
Track: HE.1.4.A
The arrival directions of ultrahigh energy extensive air showers registered at the Yakutsk array are considered. The correlations of maxima in the distribution of arrival directions of showers and doublets with the pulsar coordinates located in the galactic plane are found. It is shown that the correlation of the arrival directions of ultrahigh energy particles with the plane of Virgo clus ... More
Presented by Dr. Alexei MIKHAILOV on 7 Jul 2007 at 09:42
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 115 (6A)
We will talk about slow control system of Ashra (All-sky Survey High Resolution Air-shower detector) experiment. As the name shows, it is an experiment observing fluorescence and Cherenkov light yielded by cosmic rays, which has very wide FOV (80% of 2 pi str) and a few arc-min optical resolution. In addition to cosmic ray detection, it is able to observe star (especially transient objects ... More
Presented by Mr. Akira OKUMURA on 9 Jul 2007 at 14:45
Type: Oral Session: Plenaries 3
Track: Special
The solution to the origin of the UHECRs, like the solution to the origin of the galactic cosmic rays, depends on direct cosmic ray observations in addition to multiwavelength and UHE neutrino detections of cosmic-ray sources. The advent of Auger, IceCube, GLAST, and ground-based gamma-ray telescopes promises multi-channel data that should solve this problem. In this talk, I review favor ... More
Presented by Dr. Charles DERMER on 6 Jul 2007 at 17:25
Type: Poster Session: Posters 2 + Coffee
Track: HE.1.5 Board #: 063 (3B)
The Pierre Auger Collaboration intends to extend the energy range of its southern observatory in Argentina for high quality data from 0.1 to 3 EeV. The extensions proposed and described in accompanying papers, include three additional fluorescence telescopes with a more elevated field of view (HEAT) and a nested surface array with 750 and 433 m spacing respectively and additional muon detectio ... More
Presented by Dr. Gustavo MEDINA TANCO on 6 Jul 2007 at 14:45
Type: Oral Session: OG 2.7
Track: OG.2.7
Despite notable progress in gamma-ray astronomy, understanding the astrophysical sources of medium energy (MeV-range) gamma-rays still remains somewhat of a mystery. Medium-energy gamma-ray observations require diverse measurement techniques since the objects that produce these gamma- rays are both extended and point-like, transient and steady, and include both continuum and line emission ... More
Presented by Dr. Stanley HUNTER on 10 Jul 2007 at 10:30
Type: Poster Session: Posters 2 + Coffee
Track: HE.1.5 Board #: 050 (3A)
JEM-EUSO will study ultra-high-energy cosmic rays by their optical yield in the atmosphere. To evaluate this yield it is important to monitor the atmosphere inside the field-of-view (FOV) of the JEM-EUSO receiver. This monitoring shall permit the correction of the JEM-EUSO signal, where the critical parameters are the cloud presence and top altitude. The Atmospheric Monitoring System will ... More
Presented by Dr. Valentin MITEV, Dr. Mitsuteru SATO on 6 Jul 2007 at 14:45
Type: Poster Session: Posters 2 + Coffee
Track: HE.1.5 Board #: 043 (3A)
An atmospheric monitoring system has installed at Black Rock Mesa in the Utah desert to study the properties of atmosphere using a LIDAR(Light Detection And Ranging) system and an infra-red(IR) camera for cosmic rays experiment. The aims of atmospheric monitoring are to calibrate observed cosmic ray's energy and to determine detectable region of the fluorescence detectors. For these reasons, t ... More
Presented by Prof. Michiyuki CHIKAWA on 6 Jul 2007 at 14:45
Type: Poster Session: Posters 2 + Coffee
Track: SH.3.6 Board #: 186 (9B)
A cosmogenic radionuclide Be-7 (half life 53.3 days) results from nuclear interactions of galactic cosmic rays in the Earth's atmosphere. Most of Be-7 is produced in the lower stratosphere and slowly tranported to the surface. Be-7 plays a role of atmospheric tracer and its measurements provide an important clue on atmospheric air mass motions. Since 2002 we have continuously measured sur ... More
Presented by Prof. Masato YOSHIMORI on 6 Jul 2007 at 14:45
Type: Oral Session: HE 2.2
Track: HE.2.2
The IceCube Neutrino Detector is a cubic kilometer ice-Cherenkov detector being constructed in the deep ice under the geographic South Pole. IceCube is sensitive to high-energy muon neutrinos and muon anti-neutrinos by detecting the secondary muon produced when the neutrino interacts in or near the instrumented volume. The principal source of muon neutrinos are atmospheric neutrinos which come ... More
Presented by Dr. John PRETZ on 7 Jul 2007 at 12:29
Type: Oral Session: HE 2.2
Track: HE.2.2
The Super-Kamiokande started observation in April of 1996 and continued the data taking for five years of initial running period (SK-I) till the maintenance in July of 2001. The Super-Kamiokande continued the data taking with the half PMT density in the second period (SK-II) from resuming in December of 2002 to shutdown for the reconstruction to return the PMT density in October 2005. Us ... More
Presented by Ms. Yumiko TAKENAGA on 7 Jul 2007 at 12:41
Type: Oral Session: Opening and Hess Lecture
on 3 Jul 2007 at 17:20
Type: Poster Session: Posters 1 + Coffee
Track: HE.1.2.A Board #: 002 (1A)
The EAS characteristics relating to the lateral development of a shower at sea level are considered, namely, a mean square radius for the spatial distribution of charged particles, the total number of charged particles and muons with E(th) >= 1 GeV and their correlation at fixed energy; the longitudinal development of a shower in the atmosphere, i.e. a maximum depth of EAS. The energy-dependen ... More
Presented by Dr. Stanislav KNURENKO on 4 Jul 2007 at 14:45
Type: Poster Session: Posters 1 + Coffee
Track: OG.1.1 Board #: 148 (8A)
BESS-Polar II (the 2nd version of the BESS-Polar spectrometer) has been prepared for the next Antarctic campaign planned in December 2007. The aim of the experiment is precise measurement of the low-energy antiproton spectrum and to search for antimatter at this solar minimum period, with 5 times higher sensitivity than the total of previous measurements in BESS-Polar I. Most of the detector ... More
Presented by Dr. Thomas HAMS on 4 Jul 2007 at 14:45
Type: Poster Session: Posters 1 + Coffee
Track: OG.1.5 Board #: 130 (7A)
We carried out a balloon observation of cosmic rays using the CALET prototype at the Sanriku Balloon Center of the Japan Aerospace Exploration Agency. The prototype detector consists of 1024 scintillating fibers for track imaging and 24 BGO scintillator bricks for total absorption of cosmic rays. The observation was carried at altiude between 35 and 37 km for about 4 hours. We measured e ... More
Presented by Dr. Yuki SHIMIZU on 4 Jul 2007 at 14:45
Type: Poster Session: Posters 2 + Coffee
Track: HE.1.5 Board #: 030 (2A)
Ultra-high energy cosmic rays (UHECR's) above 100 EeV have been observed with several experiments. Their origin and propagation mechanism are still in mystery mainly due to the low statistics. In order to observe UHECR's with sufficient statistics, the JEM-EUSO experiment is going on. In the JEM-EUSO experiment, fluorescence and Cherenkov light from the extensive air showers induced by UHECR ... More
Presented by Dr. Naoto SAKAKI on 6 Jul 2007 at 14:45
Type: Oral Session: Plenaries 1
Track: Special
High altitude balloon-borne experiments have been a part of Cosmic Ray Research almost from the inception of the field. Major advances have been, and continue to be, made with balloon missions, due both to improvements in instrumentation and to advances in balloon technology and operational techniques. Today we can fly nearly two ton cosmic ray payloads for periods up to 4-6 weeks at altitud ... More
Presented by Dr. John P. WEFEL on 4 Jul 2007 at 16:30
Type: Poster Session: Posters 1 + Coffee
Track: OG.1.5 Board #: 092 (5A)
Silicon sensors with 64 pixels of 1 cm^2 area and 500 micron thickness were developed as building blocks of a large array for the charge identification of cosmic ray nuclei in balloon-borne or space-based experiments. A small telescope of sensors was exposed to pion and proton beams, interacting in a target, at CERN. Experimental results on the performance of the sensors will be reported.
Presented by Prof. Pier Simone MARROCCHESI on 4 Jul 2007 at 14:45
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 114 (6A)
The mirror facets on the VERITAS telescopes, which are of Davies-Cotton design, are aligned with the telescope axis in the horizontal position using a laser projector at the radius of curvature. The instrument used will be described. The mechanical design of the Optical Support Structure permits some gravitational slumping with elevation which can be counteracted by bias alignment (deliberat ... More
Presented by J. TONER on 9 Jul 2007 at 14:45
Type: Oral Session: OG 2.3
Track: OG.2.3
The Very Energetic Radiation Imaging Telescope Array System (VERITAS) is an array of four 12m diameter Imaging Atmospheric Cherenkov Technique (IACT) telescopes operated at the base of Mt. Hopkins in southern Arizona. The four-telescope experiment started operation in February, 2007. GeV and TeV gamma-ray observations of blazars can be used to probe the structure and composition of their jets, ... More
Presented by Prof. Henric KRAWCZYNSKI on 9 Jul 2007 at 08:30
Type: Oral Session: OG 2.4
Track: OG.2.4
Milagro is a water-Cherenkov detector capable of observing air showers produced by gamma- rays. The wide field of view (~2 sr) and high duty cycle (>90%) of Milagro make it ideal for searching for transient very high energy emission. We will report on the results of a blind search of the Milagro data for very high energy ranging from 160 μs to 6 minutes. While this analysis is primarily aimed at ... More
Presented by Mr. Vlasios VASILEIOU on 9 Jul 2007 at 12:29
Type: Poster Session: Posters 2 + Coffee
Track: OG.2.3 Board #: 154 (8A)
PG 1553+113 is a known BL Lac object, newly detected in the GeVTeV energy range by H.E.S.S. and MAGIC. The redshift of this source is unknown and a lower limit of z>0.09 was recently estimated. The very high energy (VHE) spectrum of PG 1553+113 is attenuated due to the absorption by the low-energy photon field of the extragalactic background light (EBL). Here we correct the combined H.E.S.S. ... More
Presented by Mr. Daniel MAZIN on 6 Jul 2007 at 14:45
Type: Poster Session: Posters 2 + Coffee
Track: OG.2.3 Board #: 107 (6A)
The large FOV of the AGILE Gamma-Ray Imaging Detector (GRID), 2.5 sr, will allow the whole sky to be surveyed once every 10 days in the 30 MeV - 50 GeV energy band down to 0.05 Crab Units. This fact gives the opportunity of performing the first flux-limited, high-energy g-ray all-sky survey. The high Galactic latitude point-source population is expected to be largely dominated by blazars. Seve ... More
Presented by Prof. Alessandro DE ANGELIS on 6 Jul 2007 at 14:45
Type: Poster Session: Posters 2 + Coffee
Track: HE.1.5 Board #: 079 (4B)
Muon telescopes can have several applications, ranging from astrophysical to solar-terrestrial interaction studies, and fundamental particle physics. We show the design parameters, characterization and end-to-end simulations of a detector composed by a set of three parallel dual-layer scintillator planes, buried at fix depths ranging from 0.30 m to 3 m. Each layer is 4 m2 and is compose ... More
Presented by Mr. Federico SANCHEZ on 6 Jul 2007 at 14:45
Type: Oral Session: OG 1.5
Track: OG.1.5
We are proposing the CALET mission carried out on the Japanese Experiment Module of International Space Station. Major purpose of the mission is to search for the nearby cosmic ray sources and dark matter. The detector consists of an imaging calorimeter and a total absorption calorimeter to detect the electrons and the gamma-rays up to 10 TeV with very efficient rejection power of th ... More
Presented by Prof. Shoji TORII on 6 Jul 2007 at 11:06
Type: Poster Session: Posters 3 + Coffee
Track: SH.3.1 Board #: 188 (10A)
We have proposed the CALET(CALorimetric Electron Telescope) mission to observe galactic electrons and gamma rays on ISS/JEM. In this paper we present the measurements of long-term and short-term variations of electron intensities in the helisphere. Galactic electrons of 1-100GeV energy range mostly have negative charges and the spectrum largely varies with solar activities. Thus we exp ... More
Presented by Dr. yoshiko KOMORI on 9 Jul 2007 at 14:45
Type: Oral Session: OG 1.1, OG 1.2
Track: OG.1.1
Observations from the Cosmic Ray Isotope Spectrometer (CRIS) aboard NASA’s Advanced Composition Explorer (ACE) have shown that all relevant galactic cosmic ray isotopic ratios measured are consistent with an OB-Association origin of galactic cosmic rays (GCRs). Additionally CRIS measurements of the isotopic abundances of 59Ni and 59Co have shown that the 59Ni has completely decayed into 59Co ... More
Presented by W. R. BINNS on 5 Jul 2007 at 09:30
Type: Poster Session: Posters 3 + Coffee
Track: SH.3.4 Board #: 168 (8B)
A comparative study of tri-diurnal anisotropy of Cosmic Ray intensity data has been performed for Deep River neutron monitoring station on geo magnetically 60 quietest days, 120 quiet days and all days during 1992-94. Histographic plots of percentage of occurrence of days for Phase (hrs) in a definite interval reveals that Phase is maximum in the interval of 0 to 2 hrs directions during t ... More
Presented by Mr. Mahendra RICHHARIA on 9 Jul 2007 at 14:45
Type: Oral Session: SH 1.4, SH 1.5
Track: SH.1.5
The SONG instrument onboard the CORONAS-F satellite detected solar flare gamma-ray emission in the energy range 50 keV – 300 MeV. Study of the fluxes and spectra obtained during several major flares shows presence of the gamma-ray emission at the energy > 40 MeV with the characteristic spectrum feature generated by neutral pion decay. This feature proves unambiguously that protons wer ... More
Presented by Prof. Karel KUDELA on 4 Jul 2007 at 12:53
Type: Oral Session: SH 1.3, SH 1.4
Track: SH.1.4
Fluxes of protons at the energies 0.8 - 4 GeV accelerated during solar flares of October-November 2003 were detected onboard the CORONAS-F satellite (polar circular orbit with an altitude ~450 km). The SONG instrument had sufficient geometric factor (~1500 cm2∙sr) to detect directly solar protons as a count rate exceeding above a background level when the satellite crossed a wide range o ... More
Presented by Prof. Karel KUDELA on 4 Jul 2007 at 11:18
Type: Poster Session: Posters 1 + Coffee
Track: HE.1.2.A Board #: 001 (1A)
The differential energy spectrum of cosmic rays from Cherenkov radiation measurements in EAS in the energy range of 10**15 - 10**20 eV has been compared with an anomalous diffusion model for the particles in interstellar space having fractal properties (Lagutin et al., 2001). Calculations of the spectrum have been carried out for each of five types of primary nuclei: p, He, C, Mg, Fe, and the ... More
Presented by Dr. Stanislav KNURENKO on 4 Jul 2007 at 14:45
Type: Poster Session: Posters 1 + Coffee
Track: OG.1.5 Board #: 111 (6A)
The first flight of the Cosmic Ray Energetics And Mass (CREAM) balloon experiment employed a Timing Charge Detector (TCD) and a Calorimeter. For high energy events a large background of back splash particles are created in the Calorimeter, which wash out the low Z charge peaks in the TCD. Traditionally, highly pixelated detectors are used in this situation in order to reduce the effects of the ... More
Presented by Taylor CHILDERS on 4 Jul 2007 at 14:45
Type: Poster Session: Posters 2 + Coffee
Track: HE.1.6 Board #: 061 (3B)
For a long time radio emission accompanying extensive air showers (EAS) is considered as an alternative to traditional methods of high energy cosmic ray detection (> 10^17 eV). In this paper, results of simulations of radio signals from air showers with energy greater than 10^17 eV are reported. The simulations are based on a track-by-track radio emission calculation using the EGSnrc Monte Car ... More
Presented by Dr. Ralph ENGEL on 6 Jul 2007 at 14:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.1 Board #: 037 (2B)
Utilizing the Gaisser parameterization of the differential vertical muon intensity and propagating the spectrum underground according to the statistical ionization and radiative muon energy losses, it is possible to calculate the underground muon intensity Crouch curve. In addition it is feasible to refine the spectral index of the Gaisser parameterization by minimizing the deviation from the ... More
Presented by Dr. Jeffrey DE JONG on 9 Jul 2007 at 14:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.4 Board #: 020 (1B)
We calculate the cosmic ray muon flux at ground level using the model of primary cosmic ray spectra suggested by Zatsepin and Sokolskaya. The model supposes contributions to the cosmic ray flux of three classes of sources - the shocks from exploding stars, nova and supernova of different types. The model is supported by the new data obtained in the ATIC-2 balloon experiment. Present ... More
Presented by Alexander PANOV on 9 Jul 2007 at 14:45
Type: Oral Session: SH 2.1
Track: SH.2.1
The Milagro TeV ground-level gamma-ray telescope detects Forbush decreases in several of its data channels. To understand how the instrument responds to Forbush decreases, one must calculate, through simulations, its behavior to a changing galactic cosmic-ray background as that background is modulated by heliospheric activity. To this end, we have been modeling the response of the instrumen ... More
Presented by Prof. James RYAN on 6 Jul 2007 at 09:30
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.3 Board #: 081 (4B)
The balloon-borne ANITA neutrino telescope successfully launched from McMurdo Station, Antarctica during the 2006-2007 austral summer. In this paper we present ongoing studies of the energy resolution and system response of the ANITA detector, which provide an excellent test bed for validating the ANITA Monte Carlo, and will be of great interest if ANITA discovers signal events. While ... More
Presented by D. GOLDSTEIN on 9 Jul 2007 at 14:45
Type: Poster Session: Posters 2 + Coffee
Track: HE.1.5 Board #: 040 (2B)
The air fluorescence detectors (FDs) of the Telescope Array (TA) experiment have been constructed in a dessert of Utah, USA. We can measure the longitudinal developments of EASs directly with the FDs by detecting air fluorescence lights and determine the primary energies of ultra-high energy cosmic rays. In order for accurate observation and measurements of EASs, elaborate detector cal ... More
Presented by Dr. Hisao TOKUNO on 6 Jul 2007 at 14:45
Type: Oral Session: HE 1.5
Track: HE.1.5
The surface detector of Telescope Array(TA) experiment are deployed in desert of western utah,USA. The detector consists of two layers of plastic scintillators of 3m2 area with wave length shifter fiber(WLSfiber). And at each layer,PMT are connected with WLS fibers. At each layer ,2 LEDs are also equipped to check PMT linearity. To estimate number of shower particles with good accuracy, it ... More
Presented by Dr. Toshiyuki NONAKA on 10 Jul 2007 at 11:06
Type: Poster Session: Posters 1 + Coffee
Track: OG.1.5 Board #: 124 (6B)
The Cosmic Ray Energetics And Mass (CREAM) calorimeter is designed to measure the spectra of cosmic-ray particles over the energy range from ~10^12 eV to ~10^15 eV. Its first flight as part of the CREAM-I balloon-borne payload in Antarctica during the 2004/05 season resulted in a record breaking 42 days of exposure to the cosmic radiation. A few iterations of the calibration using various bea ... More
Presented by Mr. Y. S. YOON on 4 Jul 2007 at 14:45
Type: Oral Session: HE 1.2.A
Track: HE.1.2.A
LOPES is one the pioneering experiments for the measurement of radio emission from air showers with digital radio receivers. It is set up at the site of the KASCADE-Grande air shower array and takes data in conjunction with it. This gives us the unique possibility to combine LOPES and KASCADE-Grande data. In its second phase LOPES has been extended to 30 antennas, which increases the detect ... More
Presented by Dr. Andreas HORNEFFER on 6 Jul 2007 at 10:30
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 118 (6B)
VERITAS is an array of four identical telescopes designed for detecting and measuring astrophysical gamma rays with energies in excess of 100 GeV. Each telescope uses a 12 m diameter mirror to collect Cherenkov light from air showers initiated by the incident gamma rays and direct it onto a `camera' comprising 499 photomultiplier tubes (PMTs) read out by flash ADCs. We describe here calibratio ... More
Presented by Prof. David HANNA on 9 Jul 2007 at 14:45
Type: Oral Session: OG 1.1, OG 1.2
Track: OG.1.2
Cosmic-ray interactions are the only known source of the rare isotope 6Li. The standard picture is that the observed solar 6Li is produced by galactic cosmic-rays accelerated in supernova remnants. Thus lithium-6 is a unique probe of the local Galactic (hadronic) cosmic-ray history. On the other hand, extragalactic gamma-ray background is a measure of cosmic-ray fluence but for the average st ... More
Presented by Dr. Tijana PRODANOVIC on 5 Jul 2007 at 09:18
Type: Poster Session: Posters 1 + Coffee
Track: OG.1.5 Board #: 117 (6B)
Current efforts in ground-based VHE gamma-ray astronomy use two methods: Atmospheric Cherenkov Telescopes (ACTs) and Extended Air Shower (EAS) Arrays. While ACTs typically have greater sensitivity to gamma-ray point sources and lower energy thresholds, EAS arrays have an enormous advantage in exposure to the sky due to their large fields of view (1-2 sr) and high duty cycle (>~90%). The lower ... More
Presented by Dr. Andrew SMITH on 4 Jul 2007 at 14:45
Type: Poster Session: Posters 2 + Coffee
Track: OG.2.4 Board #: 171 (9A)
Gamma-ray bursts (GRBs) have been observed up to energies of a few GeV by satellite observatories. In particular, GRB941017 showed a spectral component extending beyond 200MeV and distinct from the previously observed at keV energies. Ground based telescopes have marginally observed very high energy emission (>100GeV). For instance, the Milagrito observation of GRB970417a hinted at a distinct ... More
Presented by Dr. Cesar ALVAREZ OCHOA on 6 Jul 2007 at 14:45
Type: Oral Session: SH 3.6, SH 3.3, SH 4.2, SH 3.1
Track: SH.4.2
Using the Solar Isotope Spectrometer (SIS) on NASA's ACE spacecraft, we have measured the composition and energy spectra of anomalous cosmic rays (ACRs) near 1 AU down to energies of ~10 MeV/nucleon since August 1997. Recently these measurements have been augmented by data from the Low Energy Telescope (LET) on the STEREO spacecraft, which allows us to extend the energy spectra down to ~3 MeV ... More
Presented by Dr. Richard LESKE on 7 Jul 2007 at 12:29
Type: Poster Session: Posters 3 + Coffee
Track: SH.3.2 Board #: 192 (10A)
Past works suggest the existence of several periodicities in comic ray data. Nevertheless, the reliability of the obtained periods is not often faced. In this paper, neutron monitor and IMP data were analysed by using the Fast Fourier Transform and Wavelet techniques to determine the reliability of each identified medium- and long-term periodicity. Moreover, their relevance is analysed along ... More
Presented by Dr. Monica LAURENZA on 9 Jul 2007 at 14:45
Type: Poster Session: Posters 2 + Coffee
Track: HE.1.5 Board #: 039 (2B)
The three stations of the Telescope Array fluorescence detectors (FDs) contain 12 telescopes each, and each of the telescopes has a 256 pixel PMT camera with a field of view of 18 degree x 16 degrees. The fluorescence signals of each pixel are digitized with their waveforms by the Signal Digitizer/Finder modules (SDFs). The signal alerts from the SDFs are send to the Track Finder modules (TF) ... More
Presented by Dr. Hisao TOKUNO on 6 Jul 2007 at 14:45
Type: Poster Session: Posters 2 + Coffee
Track: SH.3.6 Board #: 210 (11A)
A procedure was developed to compute in near real-time the effective vertical cutoff rigidities for a world grid with a mesh size of 5 x 5 degrees in geographic longitude and latitude. The evaluation is made every three hours. The cutoff rigidities are calculated by the backward trajectory tracing method, where the geomagnetic field is represented by the IGRF model for the internal sources and ... More
Presented by Dr. Rolf BUETIKOFER on 6 Jul 2007 at 14:45
Type: Oral Session: OG 1.5
Track: OG.1.5
The Cosmic Ray Energetics And Mass (CREAM) experiment has now flown over Antarctica for a total of 70 days, combining a record-breaking continuous 42 days in the air with a second Long Duration Balloon flight. The array of detection techniques utilized by CREAM includes a Timing Charge Detector, a Transition Radiation Detector, a Silicon Charge Detector, and a tracking Calorimeter to obtain th ... More
Presented by T. J. BRANDT on 6 Jul 2007 at 11:42
Type: Oral Session: SH 3.4, SH 3.5
Track: SH.3.5
Energetic heavy ions with 20 – 200 MeV/n in the radiation belts have been observed by Heavy Ion Telescope (HIT) onboard TSUBASA satellite which stayed in the geostationary transfer orbit with the inclination of 28.5 deg. The observed data during quiet period in the outer region of radiation belt found out that the relative abundance for major elements, C, O, Ne, Mg, Si and Fe, were similar t ... More
Presented by Dr. Makoto HAREYAMA on 10 Jul 2007 at 09:42
Type: Oral Session: OG 1.2
Track: OG.1.2
Further analysis is made on the Tibet hybrid experiment to measure the energy spectrum of light component (proton and helium) of the cosmic rays at the knee. The result from three years observation by the burst detectors operated with Tibet III air-shower array is presented and compared with the result of the first phase experiment.
Presented by Prof. Makio SHIBATA on 4 Jul 2007 at 12:29
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.3 Board #: 040 (2B)
Following the terminology adopted by Supe-Kamiokande, Fully Contained Events are observed in the electron-neutrino which result in the cascade shower for high energy neutrino astrophysics project, such as NT200, AMANDA etc., while muon-neutrino event re observed as Partially Contained Events. Fully Contained Events are essentially only source by which we could extract the reliable inform ... More
Presented by Prof. Akeo MISAKI on 9 Jul 2007 at 14:45
Type: Oral Session: OG 2.7
Track: OG.2.7
Gamma-ray astronomy is a new emerging and very successful branch of astronomy and astrophysics. Exciting results have been obtained by the current generation Cherenkov telescope systems such as H.E.S.S., MAGIC, VERITAS and CANGAROO. The H.E.S.S. survey of the galactic plane has exhibited a large number of sources and new astrophysics as for example the question about the origin of the cosmi ... More
Presented by Dr. Thomas SCHWEIZER on 10 Jul 2007 at 11:06
Type: Oral Session: HE 2.4
Track: HE.2.4
The properties of extremely energetic neutrino- and cosmic ray-induced showers depend on the shower energy, on the type of particle initiating the shower, and on the medium. Studying these dependences is important both for understanding cascade phenomenology, and for estimating the efficiency of experiments using the radio technique. In this contribution we study the feasibility of applying ... More
Presented by Dr. Jaime ALVAREZ-MUNIZ on 10 Jul 2007 at 13:17
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 131 (7A)
The problem of identifying gamma ray events hidden in charged cosmic ray background (so called hadrons) in Cherenkov telescopes is one of the key problems in VHE gamma ray astronomy. In this contribution, we present a novel approach to this problem by implementing different classifiers relying on the information of each pixel of the camera of a Cherenkov telescope, rather than using Hilla ... More
Presented by Ms. Raquel DE LOS REYES on 9 Jul 2007 at 14:45
Type: Poster Session: Posters 2 + Coffee
Track: HE.1.5 Board #: 074 (4B)
The monitoring of atmospheric conditions is very important for fluorescence observations. Particularly, the presence of clouds can drastically distort the signal from the extensive air shower. Infra-red (IR) sensors, measuring sky temperature, can help to distinguish clouds, which are usually significantly warmer than clear skies. An array of such sensors, covering the HiRes detector's f ... More
Presented by Yulia FEDOROVA on 6 Jul 2007 at 14:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.3 Board #: 024 (2A)
Several candidate neutrino sources manifest variable electromagnetic emission, often with burst-like behaviour. It is interesting to consider that the neutrino emission from such sources could have similar time character. In the context of the so called multi-messenger approach, information from high energy neutrinos and different electromagnetic wavelengths (e.g., high gamma-rays) is combine ... More
Presented by Dr. Elisa BERNARDINI on 9 Jul 2007 at 14:45
Type: Poster Session: Posters 1 + Coffee
Track: OG.1.1 Board #: 116 (6B)
The Trans-Iron Galactic Element Recorder (TIGER) was launched in December 2001 and 2003 from McMurdo, Antarctica and was designed to observe elements ranging from 14 < Z < 40 over an extended energy range. Observations of radioactive isotopes produced during explosive nucleosynthesis such as Ni-59 that decay only through electron capture provide important constraints on the delay between nucl ... More
Presented by Dr. G. A. DE NOLFO on 4 Jul 2007 at 14:45
Type: Oral Session: HE 1.3.A
Track: HE.1.3.A
Extensive air showers are associated with transient radio emission, which could provide a new mode of detection of UHECR with an important target volume and a high duty cycle. The Codalema experiment has been set up and is running in the Radio Observatory in Nançay, France, to investigate this possibility. The apparatus is composed of an antenna array overlapped by a ground particle array. A ... More
Presented by Dr. Didier LEBRUN on 7 Jul 2007 at 08:42
Type: Oral Session: OG 2.5
Track: OG.2.5
The IceCube detector is already the world’s largest neutrino detector and when completed in 2011, will be a cubic kilometer in volume. However, even under optimistic assumptions about neutrino emission, the potential neutrino signal in IceCube from AGN and GRBs may be small. The atmospheric neutrino background after cuts will result in 1-2 neutrinos/yr/km3/deg2 above 1 TeV. For a three year ... More
Presented by Prof. Jordan GOODMAN on 10 Jul 2007 at 12:41
Type: Oral Session: SH 1.4, SH 1.5
Track: SH.1.4
In early December 2006, a large active region (number 10930) rotated over the eastern limb of the Sun. As it crossed the disk, it generated 4 X-class flares and at least 3 halo coronal mass ejections. Two large SEP events were generated when the region was at ~E70 and ~W25 and were observed by several spacecraft, including ACE and STEREO. We have combined observations from the Solar Isotope ... More
Presented by Dr. Christina COHEN on 4 Jul 2007 at 12:05
Type: Oral Session: SH 1.3, SH 1.4
Track: SH.1.4
We survey the properties (including the abundance variations) of the >20 MeV proton events (~300) that occurred in the years 1997-2005 inclusive. About 20% of the events have the properties of so-called "impulsive events" that are considered to arise from acceleration in flares. We compare the properties and associated flare phenomena of these events with those of the larger events that ... More
Presented by Dr. Hilary CANE on 4 Jul 2007 at 11:06
Type: Poster Session: Posters 1 + Coffee
Track: SH.1.4 Board #: 162 (8B)
A comparison of the energetic neutral atom observations by CELIAS/HSTOF with the Voyager 1 measurements of the termination shock particles in the heliosheath shows that the ENA hydrogen flux is consistent with Voyager 1 data. On the other hand, the ENA He flux is much higher than expected from the helium ion fluxes measured by Voyager 1. We discuss possible explanations and implications ... More
Presented by Dr. Andrzej CZECHOWSKI on 4 Jul 2007 at 14:45
Type: Oral Session: OG 1.1
Track: OG.1.1
We have performed a detailed Monte Carlo (MC) simulation for the Advanced Thin Ionization Calorimeter (ATIC) detector using the MC code FLUKA-2006 which is capable of simulating particles up to 10 PeV. The ATIC detector has completed two successful balloon flights from McMurdo, Antarctica lasting a total of more than 35 days. ATIC is designed as a multiple, long duration balloon flight, inv ... More
Presented by Dr. Rathnayaka GUNASINGHA on 4 Jul 2007 at 09:30
Type: Oral Session: HE 1.4.B
Track: HE.1.4.B
Due to geomagnetic cascading, the properties of air showers initiated by photons above 10^19 eV depend strongly on the arrival direction and on the geographical location of the experimental site. This offers the possibility of a complementary search for such ultra-high energy photons with observatories located at sites with significantly different local geomagnetic field. In this paper we comp ... More
Presented by Dr. Piotr HOMOLA on 7 Jul 2007 at 11:42
Type: Poster Session: Posters 1 + Coffee
Track: SH.1.6 Board #: 173 (9A)
The majority solar energetic particle events exhibit exponential-law decays for few-MeV protons. Profiles of mid-relativistic electrons, however, are of predominantly power-law shape. The comparison of experimental values of decay times, tau(obs), with those obtained in theoretical models considering convection transport and adiabatic deceleration shows that the expected values tau(theo ... More
Presented by Dr. Karoly KECSKEMETY on 4 Jul 2007 at 14:45
Type: Oral Session: HE 1.1.A
Track: HE.1.5
Cosmic rays with energies between 10^16.5 and 10^18.5 eV exhibit a rich range of features. The energy spectrum changes index at at least two points, known as the "second knee" and the "ankle". There appears to be a composition change in this energy regime as well, which may indicate a shift in predominance from galactic to extragalactic sources. The Telescope Array Low-Energy Extension - ... More
Presented by Prof. John BELZ on 9 Jul 2007 at 09:42
Type: Oral Session: HE 1.4.A
Track: HE.1.4.A
A key step towards the understanding of the origin of ultra-high energy cosmic rays is their mass composition. Primary photons and neutrinos produce markedly different showers from nuclei, while showers of nuclear species are not easy to distinguish. To maximise the discrimination with the Pierre Auger Observatory ideally all mass-sensitive observables should be combined, but the 10% duty cy ... More
on 4 Jul 2007 at 12:05
Type: Poster Session: Posters 2 + Coffee
Track: HE.1.6 Board #: 080 (4B)
SENECA is a hybrid air shower simulation written by H. Drescher that utilizes both Monte Carlo simulation and cascade equations. By using the cascade equations only in the high energy portion of the shower, where they are extremely accurate, SENECA is able to utilize the advantages in speed from the cascade equations yet still produce complete, three dimensional particle distributions at groun ... More
Presented by Mr. Jeff ALLEN on 6 Jul 2007 at 14:45
Type: Poster Session: Posters 1 + Coffee
Track: OG.1.5 Board #: 088 (5A)
The CALorimetric Electron Telescope (CALET) mission is proposed for the observation of high energy cosmic rays and gamma radiation for the JEM-EF attached payload on the International Space Station. The instrument, equipped with an imaging calorimeter of scintillating fibers (IMC) and a total absorption BGO calorimeter (TASC), is optimized for the measurement of cosmic ray electrons in the TeV ... More
Presented by Prof. Pier Simone MARROCCHESI on 4 Jul 2007 at 14:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.3 Board #: 046 (3A)
Theoretical predictions for neutrino fluxes indicate that km3 scale detectors are needed to detect certain astrophysical sources. The three Mediterranean experiments, ANTARES, NEMO and NESTOR are working together on a design study, KM3NeT, for a large deep-sea neutrino telescope. A detector placed in the Mediterranean Sea will survey a large part of the Galactic disc, including the Galac ... More
Presented by Mr. damien DORNIC on 9 Jul 2007 at 14:45
Type: Oral Session: HE 3.3
Track: HE.3.3
The Gamma-Ray Large Area Space Telescope (GLAST),scheduled to be launched in Fall 2007, is a next generation high energy gamma-ray observatory. The Large Area Telescope (LAT) instrument on-board GLAST with a wide field of view (>2 sr), large effective area and 20 MeV to >300 GeV energy range, will provide excellent opportunity for future Dark Matter studies. We present an overview o ... More
Presented by Dr. Eric NUSS on 10 Jul 2007 at 11:06
Type: Oral Session: HE 3.4
Track: HE.3.4
In 2005, the MAGIC telescope observed an unprecedented rapid flare from the AGN Mrk 501. A fast and strong variability was found in several adjacent energy bands above 100 GeV and was used to search for correlated flux variations at different energies. The resulting constraints on different possible Quantum Gravity effects have been investigated and will be presented.
Presented by A. BILAND on 5 Jul 2007 at 12:17
Type: Oral Session: HE 3.3
Track: HE.3.3
A number of models of quantum gravity violate Lorentz invariance and predict an energy dependence of the speed of light, leading to a dispersion of signals at high energies that travel over cosmological distances. Limits on the dispersion from short-duration substructures observed in soft gamma-rays emitted by GRBs at cosmological distances have provided interesting bounds on this violation o ... More
Presented by Prof. Stefan WAGNER on 10 Jul 2007 at 11:42
Type: Oral Session: HE 1.4.B
Track: HE.1.4.B
In a recently proposed model the cosmic rays spectrum at energies above EeV can be fitted with a minimal number of unknown parameters assuming that the extragalactic cosmic rays are only protons with a power law source spectrum. Within this minimal model, after fitting the observed HiRes spectrum with four parameters (proton injection spectrum power law index, maximum energy, minimum distance ... More
Presented by Dr. Oleg KALASHEV on 7 Jul 2007 at 09:18
Type: Oral Session: OG 1.2
Track: OG.1.2
Geminga is a nearby pulsar with an age of 3.42e+05 yr and a spin down power of 3.2e+34 erg/s at present. The wind of this pulsar most probably had powered a PWN that broke up about less than 1.e+05 yr after the birth of the pulsar. Assuming that leptonic particles accelerated by the pulsar were confined in the PWN and got released into the interstellar medium on breakup of the PWN, we calcu ... More
Presented by Dr. Ingo BUESCHING on 4 Jul 2007 at 12:17
Type: Poster Session: Posters 1 + Coffee
Track: HE.1.4.A Board #: 059 (3B)
In the context of the report by the AGASA experiment of an apparent excess in the cosmic ray flux above the energy of the expected GZK feature, a variety of "top-down models" have been proposed for the origin of ultra-high-energy cosmic rays (UHECRs). These models involve the decay of supermassive particles and generically predict high neutrino and photon fluxes at ultra-high energy. Relying o ... More
Presented by Dr. Dmitri SEMIKOZ on 4 Jul 2007 at 14:45
Type: Poster Session: Posters 1 + Coffee
Track: OG.1.5 Board #: 115 (6A)
When testing and calibrating particle detectors in a test beam, accurate tracking information independent of the detector being tested is extremely useful during offline analysis of the data. A general purpose Silicon Beam Tracker (SBT) was constructed with an active area of 32.0 x 32.0 mm^2 to provide this capability for the Cosmic Ray Energetics And Mass (CREAM) calorimeter. The tracke ... More
Presented by H. S. AHN on 4 Jul 2007 at 14:45
Type: Poster Session: Posters 1 + Coffee
Track: HE.1.4.B Board #: 028 (2A)
The light emitted by an extensive air shower undergoes scattering on molecules and aerosols in the atmosphere. The scattering effect not only attenuates the light, but also contributes to the signal recorded by a detector. Hence, this effect directly influences the determination of shower energy. In routine analyses so far only contributions from direct and singly-scattered Cherenkov photons h ... More
Presented by Prof. Henryk WILCZYNSKI on 4 Jul 2007 at 14:45
Type: Poster Session: Posters 3 + Coffee
Track: SH.3.2 Board #: 200 (10B)
An analysis of the solar magnetic field strength (B(nT)) was based on the temporal evolution of the minimum (Bmin) values in relation to the maximum (Bmax) values of the 300-year data series. Three results seem of particular significance. A two-step cycling mode is exhibited by the absolute values of Bmax and Bmin. The ratios of Br = (Bmax-Bmin)/(Bmax+Bmin) can be defined as the dimen ... More
Presented by Dr. Gisela DRESCHHOFF on 9 Jul 2007 at 14:45
Type: Oral Session: SH 2.1
Track: SH.2.1
Recently we have proposed that the long term solar modulation of galactic cosmic rays (CR) is influenced by coronal mass eyection (CME) activity. In this work, we analyze the effect of CMEs number and latitudinal changes on the CR flux during positive and negative magnetic cycles. For CME data, we use both, recent observations by the Large Angle and Spectrometric Coronagraph (LASCO) expe ... More
Presented by Dr. Alejandro LARA on 6 Jul 2007 at 08:30
Type: Oral Session: OG 1.1, OG 1.2
Track: OG.1.1
The Cosmic Ray Energetics And Mass balloon-borne experiment has accumulated 70 days of exposure during two successful flights in Antarctica. The instrument is configured with complementary and redundant particle detectors. Energy measurements are made with a transition radiation detector and an ionization calorimeter. Charge measurements are made with timing, pixelated Si, and Cherenko ... More
Presented by Prof. Eun-Suk SEO on 5 Jul 2007 at 08:30
Type: Oral Session: OG 1.1
Track: OG.1.1
The first long-duration balloon flight of TRACER in 2003 provided high-quality measurements of the primary cosmic-ray nuclei over the range oxygen (Z = 8) to iron (Z = 26). The analysis of these measurements is now complete, and we will present the individual energy spectra and absolute intensities of the nuclei O, Ne, Mg, Si, S, Ca, A, and Fe. The spectra cover the energy range from 1 GeV/n ... More
Presented by Dr. Patrick BOYLE on 4 Jul 2007 at 10:42
Type: Poster Session: Posters 2 + Coffee
Track: SH.3.6 Board #: 184 (9B)
The study of cosmic rays (CRs) is a very mature subject developed around the concept of radiative particle flux phi as a mono-variant function of energy E, that is phi = phi(E). This is based on the notion of the cosmos as being filled with cosmic radiation in the form of a collisionless exosphere of plasma. Neutrals, however, are likewise ubiquitous in space and planetary trapped-radiat ... More
Presented by Dr. Thomas WILSON on 6 Jul 2007 at 14:45
Type: Poster Session: Posters 3 + Coffee
Track: SH.4.3 Board #: 183 (9B)
Observations of cosmic-ray helium energy spectra provide important constraints on cosmic ray origin and propagation. However, helium intensities measured at Earth are affected by solar modulation, especially below several GeV/nucleon. Observations of helium intensities over a solar cycle are important for understanding how solar modulation affects galactic cosmic ray intensities and for sepa ... More
Presented by Dr. Georgia DE NOLFO on 9 Jul 2007 at 14:45
Type: Oral Session: SH 3.6
Track: SH.3.6
We present a physical model to calculate cosmic ray induced ionization in the atmosphere. The model is based on the Monte-Carlo CORSIKA tool, which simulates full development of an electromagnetic-muon-nucleonic cascade in the atmosphere, with the FLUKA package used for low energy interactions. The model is applicable to the entire atmosphere, from the ground up to the stratosphere. A comparis ... More
Presented by Dr. Ilya USOSKIN on 7 Jul 2007 at 09:18
Type: Poster Session: Posters 2 + Coffee
Track: SH.3.6 Board #: 188 (10A)
Earlier we have found a significant statistical relationship between geomagnetic activity as measured by the Kp index and hurricane intensity as measured by the maximum wind speed for a certain type of higher-latitude hurricanes. Here we reexamine this relationship comparing changes in cosmic ray intensity and hurricane intensification rates (time derivative of hurricane intensity). Intensific ... More
Presented by Prof. Stilian KAVLAKOV on 6 Jul 2007 at 14:45
Type: Poster Session: Posters 1 + Coffee
Track: HE.1.2.A Board #: 048 (3A)
We have installed a new air shower array at Mount Chacaltaya (5,200m above sea level) to observe primary cosmic rays with energies greater than 10^15 eV. In our previous experiments, we measured energy spectrum and nuclear composition of primary cosmic rays around the knee region. Above all, we obtained the cosmic ray composition with three independent techniques, namely from the equi-i ... More
Presented by Dr. Yoshiki TSUNESADA on 4 Jul 2007 at 14:45
Type: Oral Session: SH 3.2
Track: SH.3.2
As part of our on-going investigation of the charge-sign dependence in solar modulation, we measured the cosmic ray positron abundance (~1GeV) on a long duration balloon flight from Kiruna, Sweden to Victoria Island, Canada during June 2006. Preliminary results from this flight will be presented and compared to previous results.
Presented by Prof. Paul EVENSON on 9 Jul 2007 at 11:42
Type: Poster Session: Posters 2 + Coffee
Track: HE.1.5 Board #: 026 (2A)
Cosmic Ray Tau Neutrino Telescope (CRTNT) is designed to detect tau lepton showers initiated from Earth-skimming tau neutrinos. A potential site is located at Balikun, Xinjiang, China. Two CRTNT Cerenkov imaging telescopes are installed at Yangbajing, Tibet (4300m a.s.l.) near the ARGO-YBJ RPC carpet detector, with which coincident observation of cosmic ray showers above 10^14 eV is perf ... More
Presented by Prof. Huihai HE on 6 Jul 2007 at 14:45
Type: Poster Session: Posters 2 + Coffee
Track: SH.3.6 Board #: 206 (10B)
Physical model for calculation cosmic ray induced ionization in the atmosphere is presented. The model is based on Monte Carlo simulation with CORSIKA 6.52 code using FLUKA and QGSJET hadronic interaction subroutines. On the basis of the simulation results the ion pair production in the atmosphere and the impact of the different shower components, precisely the electromagnetic, muon and hadronic i ... More
Presented by Prof. Peter VELINOV on 6 Jul 2007 at 14:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.3.3 Board #: 070 (4A)
For energies less than ~3 GeV/n, the Cosmic Rays Antideuteron component due to spallation becomes negligible for kinematic reasons and the detection of even a single antideuteron would strongly suggest the existence of new sources, like neutralino Dark Matter. The AMS-02 experiment, on board of ISS for a long duration mission (3 years), thanks to its large acceptance (~ 0.5 m2 sr) and it ... More
Presented by Dr. Francesca GIOVACCHINI on 9 Jul 2007 at 14:45
Type: Oral Session: HE 1.4.A
Track: HE.1.4.A
The High Resolution Fly's Eye (HiRes) fluorescence detectors have been collecting extensive air shower (EAS) data for more than 6 years . The obtained statistics allows us to more precisely estimate the mass composition of the ultra high energy cosmic rays (UHECR). In this study we summarize the stereo shower parameters measurements, especially X_{max} measurements. The sensitivity limit ... More
Presented by Yulia FEDOROVA on 4 Jul 2007 at 08:54
Type: Oral Session: SH 3.6
Track: SH.3.6
It has been claimed (Szensmark, 2007, and others) that observed correlations of terrestrial cloud cover with 'the cosmic ray intensity' are casual. The possibility arises, therefore of a connection between cosmic ray intensity and Global Warming. If true, the implications would be very great. An examination of the situation is made.
Presented by Prof. Arnold WOLFENDALE on 7 Jul 2007 at 09:42
Type: Oral Session: Plenaries 3
Track: Special
There are two kinds of relations between cosmic ray research and investigations of space weather effects. Since energetic particles in space and low energy cosmic rays interact with materials of the satellite and airplane systems as well as with the atmosphere, monitoring of the changes of flux of cosmic particles especially during solar flares, space storms and geomagnetic disturbances is imp ... More
Presented by Dr. Karel KUDELA on 6 Jul 2007 at 17:55
Type: Oral Session: OG 1.2, OG 1.3
Track: OG.1.2
We consider a generalized statistical model for the production process of cosmic rays. This model takes into account temperature distribution of sources and yields Tsallis statistics for cosmic ray energy spectrum. Results are compared with the experimental data.
Presented by Dr. Zbigniew WLODARCZYK on 5 Jul 2007 at 10:30
Type: Oral Session: HE 1.2.A
Track: HE.1.2.A
Cosmic ray showers that trigger the IceTop surface array generate high energy muons that are measured by the IceCube in-ice detector. The large surface and underground area of this 3-dimensional instrument at completion guaranties significant statistics for shower energy up to about 1 EeV. Since the number of muons is sensitive to the type of the primary cosmic ray nucleus these events can be ... More
Presented by Dr. Chihwa SONG on 6 Jul 2007 at 09:06
Type: Poster Session: Posters 3 + Coffee
Track: HE.3.5 Board #: 076 (4B)
One of the severe limitations in detecting neutrino signals from nuclear reactors is that the copious cosmic ray background imposes the use of a time veto upon the passage of the muons to reduce the number of fake signals due to muon-induced spallation neutrons. For this reason neutrino detectors are usually located underground, with a large overburden. However there are practical limitations ... More
Presented by Dr. Edgar CASIMIRO LINARES on 9 Jul 2007 at 14:45
Type: Oral Session: HE 3.3
Track: HE.3.3
As a prototype for the AMS-02 experiment, the AMS-01 particle spectrometer was flown on the Space Shuttle Discovery in near earth orbit for a ten day mission in June 1998. Concerning the identification of positrons, AMS-01 was limited to energies below 3 GeV due to the vast proton background and the characteristics of the subdetectors. In order to extend the sensitivity towards higher ener ... More
Presented by Prof. Stefan Schael SCHAEL on 9 Jul 2007 at 11:50
Type: Poster Session: Posters 1 + Coffee
Track: HE.1.3.A Board #: 011 (1B)
Simulations of ultra high energy showers that may be generated by different primaries and observed with space detectors are performed. A special driver is developed which enables to treat neutrino as a primary particle in the framework of the traditional codes (AIRES, CORSIKA). Possibilities of the TUS detector employment for ultra high energy neutrino studies are discussed.
Presented by Mr. Jorge COTZOMI on 4 Jul 2007 at 14:45
Type: Poster Session: Posters 1 + Coffee
Track: OG.1.3 Board #: 110 (6A)
The first flight of the Cosmic Ray Energetics And Mass (CREAM) balloon experiment flew for a record breaking 42 days from McMurdo Station in Antarctica and utilized a Calorimeter, a Transition Radiation Detector, and a Timing Charge Detector to measure charge and energy. Galactic cosmic ray propagation models make predictions that fit current low energy spectra. With the high energy data colle ... More
Presented by Taylor CHILDERS on 4 Jul 2007 at 14:45
Type: Poster Session: Posters 2 + Coffee
Track: HE.1.6 Board #: 035 (2B)
The dominant background for observations of gamma-rays in the energy region above 50 GeV with Imaging Atmospheric Cherenkov telescopes are cosmic-ray events. The images of most of the cosmic ray showers look significantly different from those of gamma-rays and are therefore easily discriminated. However, a small fraction of events seems to be indistinguishable from gamma-rays. This constit ... More
Presented by Dr. Gernot MAIER on 6 Jul 2007 at 14:45
Type: Oral Session: OG 1.2, OG 1.3
Track: OG.1.2
Gamma rays have long been recognized as a uniquely powerful probe of the existence, origin, and nature of cosmic rays beyond the solar system. The unprecedented sensitivity and resolution of GLAST should for the first time confirm the presence of cosmic rays in Local Group galaxies today, and in all galaxies throughout the history of cosmic star formation. We show that GLAST should detect, ... More
Presented by Prof. Brian FIELDS on 5 Jul 2007 at 10:42
Type: Oral Session: OG 1.4+2.2
Track: OG.1.4
Nearly ten years after the discovery of the supernova remnant RX J0852.0-4622 ("Vela Jr.") with ROSAT in 1998, many important parameters of the remnant are still largely uncertain. Distance estimates range between 200 pc and 1-2 kpc, with correspondingly different estimates on the time and type of the supernova explosion. We present the application of our kinetic theory of cosmic ray accelera ... More
Presented by Prof. Heinrich J. VOELK on 7 Jul 2007 at 09:18
Type: Oral Session: OG 2.5
Track: OG.2.5
We calculate the flux of neutrinos generated by the propagation of ultra-high energy nuclei over cosmological distances. The propagation takes into account the interactions with cosmic background radiations including the CMB and the most recent estimates of higher energy (infra-red, optical, and ultra violet) backgrounds. We assume that the composition of ultra-high energy cosmic rays (UHECRs ... More
Presented by Dr. Nicolás BUSCA on 9 Jul 2007 at 13:17
Type: Poster Session: Posters 2 + Coffee
Track: SH.3.6 Board #: 213 (11A)
L. I. Dorman (1,2), O. A. Danilova (3), M. I. Tyasto (3), N. G. Ptitsina (3), G. Villoresi (4), N. Iucci (4) and M. Parisi (4)  (1) Israel Cosmic Ray Center affiliated to Tel Aviv University, Technion and Israel Space Agency, Israel; (2) IZMIRAN, Troitsk, Russia; (3) SPbFIZMIRAN, St. Petersburg, Russia; (4) Dipartimento di Fisica "E. Amaldi", Università "Roma Tre", Rome, Italy I ... More
Presented by Prof. Lev DORMAN on 6 Jul 2007 at 14:45
Type: Oral Session: OG 2.2
Track: OG.2.2
The H.E.S.S. stereoscopic Cherenkov telescope system has observed the Crab nebula since January 2004 with the complete four telescope array. The stable signal from this pulsar wind nebula (PWN) has been used to verify the performance and calibration of the instrument because of its high flux compared to the H.E.S.S sensitivity. These observations allow us also to study the radiation mechan ... More
Presented by Dr. Bruno KHÉLIFI on 6 Jul 2007 at 11:06
Type: Poster Session: Posters 3 + Coffee
Track: HE.3.5 Board #: 077 (4B)
The Zero Degree Detector (ZDD) is a new instrument that has been used in accelerator exposures to measure the angular dependence of secondary particles produced in fragmentation experiments. The ZDD uses two identical layers of pixelated silicon detectors that make coincident measurements over the active area of the instrument. The angular distribution of secondary particle produced in n ... More
Presented by Dr. Mark CHRISTL on 9 Jul 2007 at 14:45
Type: Oral Session: HE 1.5
Track: HE.1.5
GRAPES-3 experiment employs a high-density array of scintillators and a large area tracking muon telescope. The GRAPES collaboration is being expanded with addition of several major facilities. These include a Cerenkov telescope and low frequency dipole array for the measurement of shower energy. Addition of several modules of muon telescopes to cover a larger area, expansion of the scintilla ... More
Presented by Prof. Sunil GUPTA on 10 Jul 2007 at 12:29
Type: Oral Session: HE 3.3
Track: HE.3.3
The Alpha Magnetic Spectrometer (AMS), to be installed on the International Space Station, will provide data on cosmic radiations in a large range of rigidity from 0.5 GV up to 2 TV. The main physics goals in the astroparticle domain are the anti- matter and the dark matter searches. Observations and cosmology indicate that the Universe may include a large amount of unknown Dark Matter. It sh ... More
Presented by Dr. Sylvie ROSIER-LEES on 10 Jul 2007 at 10:42
Type: Poster Session: Posters 2 + Coffee
Track: HE.1.5 Board #: 065 (4A)
The Telescope Array(TA) experiment will investigate the origin of the ultrahigh energy cosmic rays (UHECRs). This experiment is a hybrid observation of an air shower array and fluorescence telescopes installed in Utah, USA. We finised deploying about 500 Surface Detectors(SDs) for AS array to our site in winter of 2006-2007, and start SD operation from April 2007. Effective area of this arr ... More
Presented by Dr. SHUNSUKE OZAWA on 6 Jul 2007 at 14:45
Type: Poster Session: Posters 2 + Coffee
Track: HE.1.5 Board #: 041 (2B)
The construction of the fluorescence detectors (FDs) of the Telescope Array (TA) experiment will be completed in June 2007, and the first observation with the full configuration is planned in summer in this year. In this paper, we describe the development of the data acquisition (DAQ) system for the TA FD observations. The DAQ system of each TA FD station is comprised of 16 CPUs: 13 fo ... More
Presented by Dr. Hisao TOKUNO on 6 Jul 2007 at 14:45
Type: Oral Session: SH 2.1
Track: SH.2.1
Project GRAND, an array of proportional wire chambers with muon identification, is used to examine the decrease in ground level muon counting rate during the Forbush decrease event of September 11, 2005. Data are presented and compared to that of other cosmic ray muon and neutron monitor detectors. GRAND's angular resolution capabilities allows a directional study of the Forbush decrease.
Presented by Prof. John POIRIER on 6 Jul 2007 at 09:18
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.2 Board #: 078 (4B)
Both, Super-Kamiokande-I and SNO have reported a day night asymmetry that, after statistics and systematics are accounted for, is consistent with zero. Nevertheless, the Kamiokande values of 2.1% is sizable and, at least in sign, consistent with theoretical expectations. Taking into account in a simplified, yet realistic way the internal structure of the Earth, we present new analytical and nu ... More
Presented by Dr. Daniel SUPANITSKY on 9 Jul 2007 at 14:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.3 Board #: 067 (4A)
The unknown flux of prompt atmospheric neutrinos presents a challenging background to searches for extra-terrestrial neutrinos in high-energy detectors. Uncertainties in this flux will weaken the power of the detector to place constraints on other expected signals. A new likelihood analysis, using the full information present in event arrival directions and energy will be presented, which ... More
Presented by Gary HILL on 9 Jul 2007 at 14:45
Type: Poster Session: Posters 2 + Coffee
Track: SH.3.6 Board #: 208 (11A)
An application of absorption effect of the CR neutron component to the estimation of snow-water equivalent is considered in this work. The primary CR variations, changes of the atmospheric pressure and humidity concentration in bedding surface are discussed as influence on the accuracy of the obtained results. Monitoring of the snow-cover during several seasons demonstrated an efficiency ... More
Presented by Dr. Viktor YANKE on 6 Jul 2007 at 14:45
Type: Poster Session: Posters 1 + Coffee
Track: HE.1.4.A Board #: 047 (3A)
Basing on the EAS simulations with CORSIKA we investigate the lateral distributions of electrons with a fixed energy in large showers. We show how these distributions scale with electron energy, with air density and/or shower age. We fit some analytical functions to describe them in an easy way. This work is necessary when reconstructing the shower parameters from the light images obtained ... More
Presented by Prof. Maria GILLER on 4 Jul 2007 at 14:45
Type: Poster Session: Posters 2 + Coffee
Track: HE.1.5 Board #: 019 (1B)
A new small array of cherenkov detectors is deployed in Tehran, 1200 m above sea level. This array contains of four tanks full of distilled water with diameter of 60 cm and height of 120 cm. The effective area of each tank is about 0.6 . They are used to detect the air showers and to record the arrival time of the secondary particles. We have collected about 200000 EAS in 1894 h of obser ... More
Presented by Ms. Farzaneh SHEIDAEI on 6 Jul 2007 at 14:45
Type: Poster Session: Posters 1 + Coffee
Track: HE.1.2.B Board #: 036 (2B)
Moliere simultaneous distribution between the deflection angle and the lateral displacement is derived by applying numerical Fourier transforms on the solution for frequency distribution acquired through Kamata-Nishimura formulation of Moliere theory. The differences of our result from that under the gaussian approximation and the basic properties of our distribution are investigated clo ... More
Presented by Prof. Takao NAKATSUKA on 4 Jul 2007 at 14:45
Type: Poster Session: Posters 2 + Coffee
Track: HE.1.5 Board #: 081 (4B)
We discuss a general scheme of the optics and electronics read out as well as preliminary test results of a detector prototype for the space fluorescence telescope TUS (FD-TUS). The mirror of this prototype is coupled to an 8 by 8 pixel camera. Each of the 64 pixels is read by one PMT of 13 mm diameter (Hamamatsu model R1463) . The optics design is a multi-hexagonal segmented telescope with fo ... More
Presented by Dr. Humberto SALAZAR on 6 Jul 2007 at 14:45
Type: Poster Session: Posters 2 + Coffee
Track: HE.1.5 Board #: 013 (1B)
The HESS, MAGIC and VERITAS experiments are now fully operational and are detecting and discovering a large number of high-energy gamma-ray sources. This is a good time to work on the design of the next generation of IACT experiments. We estimate the limiting angular resolution and detection area for an array of 3 large-aperture IACTs. We consider an idealized IACT system in order to under ... More
Presented by Dr. Viatcheslav BUGAEV on 6 Jul 2007 at 14:45
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 121 (6B)
Recently, ground-based very high-energy gamma-ray astronomy achieved a remarkable advancement in the development of the observational technique for the registration and study of gamma-ray emission above 100 GeV. Construction of telescopes of substantially larger size than the currently used 12 m class telescopes can drastically improve the sensitivity of ground-based detectors for gamma rays o ... More
Presented by Dr. Alexander KONOPELKO on 9 Jul 2007 at 14:45
Type: Poster Session: Posters 2 + Coffee
Track: HE.1.5 Board #: 023 (2A)
The use of the radio-detection technique in a wide area cosmic-ray detector requires autonomous antenna stations, in terms of power feeding, triggering and data transmission. A prototype has been tested at the Nançay Radio Observatory (France). It uses the broadband (1-200 MHz) active dipoles installed on the CODALEMA experiment (see other contributions in this conference), together with a s ... More
Presented by Dr. Benoit REVENU on 6 Jul 2007 at 14:45
Type: Poster Session: Posters 2 + Coffee
Track: OG.2.4 Board #: 163 (8B)
We present a summary of AMANDA results obtained in searches for neutrinos from Gamma-Ray Bursts (GRBs). Using simulations, we show how the IceCube detector, which is currently being constructed at the South Pole, will improve the sensitivity of the search. In order to improve the prospects for detections of gamma-ray dark bursts, as well as core collapse Supernovae (SNe), we discuss a novel ... More
Presented by Dr. Marek KOWALSKI on 6 Jul 2007 at 14:45
Type: Poster Session: Posters 2 + Coffee
Track: OG.2.3 Board #: 137 (7B)
We discuss the prospect of detecting a spectral break in the gamma-ray spectra of blazars due to the extragalactic background light in the near to mid-IR. A measurable break in the TeV spectra could arise from the drop in the EBL density above ~ 1um. This change in the spectral index is mediated by the ratio of the near to mid-IR density of EBL. A detection of such a spectral feature co ... More
Presented by Mr. Asif IMRAN on 6 Jul 2007 at 14:45
Type: Poster Session: Posters 2 + Coffee
Track: OG.2.3 Board #: 102 (5B)
Observations of PKS 2155-304 with the CANGAROO-III imaging atmospheric Cherenkov telescope were performed for 5 nights from July 28 to August 2 in 2006, just after H.E.S.S. reported that this target object was at a strong active state. Signal exceeding 6 sigma significance level was detected in the effective live time of 15.0 hours using three-fold steroscopic data set. Obtained time ave ... More
Presented by Ms. Yukiko SAKAMOTO on 6 Jul 2007 at 14:45
Type: Oral Session: SH 1.3, SH 1.4
Track: SH.1.3
In association with the large solar flare of April 15th 2001, the Chacaltaya neutron monitor observed an 8.2 sigma enhancement of the counting rate between 13:51 and 14:24 UT. Since the enhancement was observed from 11 minutes before the GLE, solar neutrons must be involved in this enhancement. Comparing with the Yohkoh Soft X-ray Telescope images with the observed particle time profi ... More
Presented by Prof. Yasushi MURAKI on 4 Jul 2007 at 10:30
Type: Oral Session: Plenaries 2
Track: Special
The radio technique for the detection of cosmic particles has seen a major revival in recent years. New and planned experiments in the lab and the field, such as GLUE, Anita, Codalema, LOPES and LOFAR as well as sophisticated Monte Carlos experiments have produced a wealth of new information. Radio emission of ultra-high energy cosmic particles offers a number of interesting advantages. Since ... More
Presented by Dr. Heino FALCKE on 5 Jul 2007 at 17:55
Type: Oral Session: OG 2.7
Track: OG.2.7
We have detected Cherenkov light from air showers with Geiger-mode APDs (G-APDs). G-APDs are novel semiconductor photon-detectors which offer several advantages compared to conventional photomultiplier tubes in the field of air shower detection. Folded with the Cherenkov spectrum the response of G-APDs is up to a factor of three higher if compared with classical photomultipliers. Moreover th ... More
Presented by Mr. A. Nepomuk OTTE on 9 Jul 2007 at 11:42
Type: Oral Session: SH 3.6
Track: SH.3.6
The increasing number of reports on the gamma-ray detection from thunder clouds and lightenings indicate that charged particles are accelerated by the strong electric fields associated with the thunder phenomena. In order to search for high-energy radiation from winter thunder clouds in the Japan sea coast areas, we have set up an autonomous radiation detection system at Kashiwasaki, Niigata p ... More
Presented by Mr. Teruaki ENOTO on 7 Jul 2007 at 10:42
Type: Poster Session: Posters 1 + Coffee
Track: HE.1.4.A Board #: 005 (1A)
The study of Ultra High Energy Cosmic Rays represents one of the most challenging topic in this field. The interaction of primary particles with atmospheric nuclei produces a huge Extensive Air Shower together with isotropic emission of UV fluorescence light and highly directional Cherenkov photons, that are reflected/diffused isotropically by the impact on the Earth's surface or on h ... More
Presented by M. C. MACCARONE on 4 Jul 2007 at 14:45
Type: Poster Session: Posters 2 + Coffee
Track: OG.2.3 Board #: 091 (5A)
The MAGIC telescope has observed very high energy gamma-ray emission from the AGN 1ES 2344+514. A gamma-ray signal corresponding to an 11 sigma excess and an integral flux of (2.38+-0.30)*10^-11 cm^-2 s^-1 above 200 GeV has been obtained from 23.1 hours of data taking between 2005 August 3 and 2006 January 1. The data confirm the previously detected gamma-ray emission from this object during a ... More
Presented by Dr. Robert WAGNER on 6 Jul 2007 at 14:45
Type: Oral Session: OG 2.3
Track: OG.2.3
The MAGIC telescope has observed very high energy gamma-ray emission from the BL Lac object PG 1553+113 in 2005 and 2006 at an overall significance is 8.8 sigma in 18.8h. The light curve shows no significant flux variations on a daily time-scale. The flux level during 2005 was, however, significantly higher compared to 2006. The differential energy spectrum between ~90 GeV and 500 GeV is well ... More
Presented by Dr. Robert WAGNER on 9 Jul 2007 at 10:30
Type: Poster Session: Posters 1 + Coffee
Track: SH.2.1 Board #: 186 (9B)
We have developed a method for determining ICME (Interplanetary coronal mass ejection) geometry from galactic cosmic ray data recorded by the ground- based muon detector network. The cosmic ray density depression inside the ICME, which is the cause of a Forbush decrease, is represented as an expanding cylinder based on a theoretical model of the cosmic ray particle diffusion. ICME geometr ... More
Presented by Dr. Takao KUWABARA on 4 Jul 2007 at 14:45
Type: Poster Session: Posters 1 + Coffee
Track: OG.1.5 Board #: 132 (7A)
We have a plan to apply CALET (CALorimetric Electron Telescope) to make observations of high energy cosmic rays, electrons, gamma-rays, and nuclei, on the International Space Station (ISS). The detector of CALET consists of an imaging calorimeter (IMC) and a total absorption calorimeter (TASC). We have been developing front end circuits for the IMC and TASC. We also made a scale model (1 ... More
Presented by Dr. Yuki SHIMIZU on 4 Jul 2007 at 14:45
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 102 (5B)
The night sky light is one of the major components of background for imaging air Cherenkov telescopes. It disturbs images of air shower and makes both the gamma/hadron separation and the angular resolution worse. For example, The CANGAROO-III electronics consists of charge ADCs and multi-hit TDCs. In using charge ADCs, we have to delay the signal from PMTs until the trigger signal input to ADC ... More
Presented by Mr. Taku MIZUKAMI on 9 Jul 2007 at 14:45
Type: Poster Session: Posters 1 + Coffee
Track: OG.1.5 Board #: 131 (7A)
We have been developing the CALET instrument, which is proposed to be launched on the Japanese Experiment Module (JEM), Exposed Facility (EF) of the ISS. CALET consists of an imaging calorimeter (IMC) and a total absorption calorimeter (TASC). The role of IMC is identification of the incident particle by imaging the shower tracks with scintillating fibers. TASC is used for observing the t ... More
Presented by Dr. yusaku KATAYOSE on 4 Jul 2007 at 14:45
Type: Poster Session: Posters 1 + Coffee
Track: OG.1.5 Board #: 125 (6B)
The observation of trans-iron nuclei in galactic cosmic rays (Z30) requires a high performance cosmic ray detector telescope with a very large exposure area because of their extremely low fluxes. It is realized by the use of solid-state track detector of CR-39, which has an advantage of easy extension of exposure area. The verification of mass and nuclear charge identifications with CR-39 s ... More
Presented by Mr. Satoshi KODAIRA on 4 Jul 2007 at 14:45
Type: Oral Session: HE 2.5
Track: HE.2.5
A promising method for the detection of UHE neutrinos is the Lunar Cherenkov technique, which utilises Earth-based radio-telescopes to detect the coherent Cherenkov radiation emitted when one of these particles interacts in the outer layers of the Moon. The LUNASKA project aims to overcome the technological limitations of past experiments to utilise the next generation of radio-telescopes ... More
Presented by Mr. Clancy JAMES on 7 Jul 2007 at 10:30
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.1 Board #: 034 (2B)
There are small differences in both ionization energy loss and catastrophic energy loss between positive and negative muons, which are usually neglected in most Monte Carlo simulations. These small differences can be amplified when measuring the charge ratio underground, where the total energy loss between the surface and the measurement is significant. Calculations of these effects fo ... More
Presented by Dr. Maury GOODMAN on 9 Jul 2007 at 14:45
Type: Oral Session: HE 2.3
Track: HE.2.3
Many astrophysical models predict a diffuse flux of high-energy neutrinos from active galactic nuclei and other extra-galactic sources. At muon energies above 1 TeV, the upward-going muon flux induced by neutrinos from active galactic nuclei is expected to exceed the flux due to atmospheric neutrinos. We have performed a search for this astrophysical neutrino flux by looking for upward-going m ... More
Presented by Molly SWANSON on 5 Jul 2007 at 12:35
Type: Oral Session: HE 2.3
Track: HE.2.3
The AMANDA-II data collected during the period 2000-03 have been analysed in a search for a diffuse flux of high-energy extra-terrestrial neutrinos from the sum of all sources in the universe. With no excess of events seen, an upper limit on an E-2 flux of E2 Phi < 8.8 x 10-8 GeV cm-2 s-1 sr-1 was obtained. The astrophysical implications of this bound and of others obtained for specific mo ... More
Presented by Gary HILL, Jessica HODGES, Kotoyo HOSHINA on 5 Jul 2007 at 09:35
Type: Oral Session: SH 3.4, SH 3.5
Track: SH.3.4
We present preliminary results of measuring the direction of the anisotropy vector of cosmic ray intensity. The measurements were made with the Carpet air shower array of the Baksan Neutrino Observatory. The anisotropy vector direction is determined by analyzing the distribution of time delays of the shower signal detected by distant detectors of the array relative to the array’s centr ... More
Presented by Dr. Alexander LIDVANSKY on 10 Jul 2007 at 08:42
Type: Oral Session: HE 1.1.A
Track: HE.1.1.B
The values of the spectral indices of the cosmic ions below the knee energy band are of notable importance for a quantitative account of the characteristic of the knee and the ankle of the differential energy spectrum of the cosmic radiation. Present available measurements of proton and helium spectral indices below the knee energy interval from a variety of experiments are examined. Acc ... More
Presented by Dr. Antonio CODINO on 6 Jul 2007 at 11:45
Type: Oral Session: OG 2.2
Track: OG.2.2
Recent development in the analysis techniques used by the Milagro collaboration had resulted in the discovery of an extended TeV gamma-ray source in the Cygnus region of the Galaxy. The new source MGRO J2019+37 has been detected at median energies of 12 TeV. In addition to this extended source, new TeV gamma-ray sources have been discovered at the same median energies when more data was analy ... More
Presented by Mr. Aous ABDO on 7 Jul 2007 at 11:06
Type: Poster Session: Posters 2 + Coffee
Track: OG.2.2 Board #: 095 (5B)
H.E.S.S. observations of the old-age (more than 10000 yrs; about 0.5 deg diameter) composite SNR W28 reveal TeV emission situated at its northeastern and southern boundaries. The northeastern TeV source is in an area where W28 is interacting with a dense molecular cloud, containing OH masers, local radio and X-ray peaks. The southern TeV sources are found in a region occupied by several HI ... More
Presented by Dr. Gavin ROWELL on 6 Jul 2007 at 14:45
Type: Oral Session: OG 2.3
Track: OG.2.3
Since the new generation of imaging atmospheric Cherenkov telescopes came online with the commissioning of the four telescopes of the H.E.S.S. experiment in 2004, the number of known extragalactic gamma- ray emitters in the very high energy (VHE) domain has more than doubled. All of the sources detected so far are active galactic nuclei and all but one belong to the class of BL Lac objects. T ... More
Presented by Mr. Martin RAUE on 9 Jul 2007 at 09:06
Type: Poster Session: Posters 2 + Coffee
Track: OG.2.3
The extreme synchrotron BL Lac object PKS 0548-322 has been observed with the High Energy Stereoscopic System (H.E.S.S) array of atmospheric-Cherenkov telescopes. The observations were performed between October 2004 and December 2006 for a total exposure of nearly 25 hours live-time. We will report the HESS detection and present a spectral energy distribution of this object using a quasi-simultan ... More
Presented by Dr. Bruno KHELIFI on 6 Jul 2007 at 14:45
Type: Oral Session: OG 2.2
Track: OG.2.2
The H.E.S.S. telescope has detected a new very high energy gamma-ray point-like source, HESS J0632+058. It is the first point-like source detected by H.E.S.S. without any obvious counterpart. The excess lies in a region where interaction between the Monoceros supernova remnant and the Rosette Nebula may occur. The energy spectrum of the observed gamma-rays is well described by a power law of i ... More
Presented by Mr. Armand FIASSON on 4 Jul 2007 at 11:30
Type: Oral Session: OG 2.3, 2.4
Track: OG.2.3
The giant radio galaxy M87 was observed at GeV/TeV gamma-ray energies with the H.E.S.S. (High Energy Stereoscopic System) Cherenkov telescopes in the years 2003-2006. The observations confirm M87 as the first extragalactic TeV gamma-ray source not of the blazar type (first indications of a signal were reported by the HEGRA collaboration earlier). The TeV gamma-ray flux from M87 as measured wit ... More
Presented by Dr. Matthias BEILICKE on 10 Jul 2007 at 08:42
Type: Poster Session: Posters 2 + Coffee
Track: OG.2.2 Board #: 119 (6B)
Motivated by recent detections of pulsar wind nebulae in very-high-energy (VHE) gamma rays, a systematic search for VHE gamma-ray sources associated with energetic pulsars was performed, using data obtained with the H.E.S.S. (High Energy Stereoscopic System) instrument. The search for VHE gamma-ray sources near the pulsar PSR J1718-3825 revealed the new VHE gamma-ray source HESS J1718-385. We ... More
Presented by Svenja CARRIGAN on 6 Jul 2007 at 14:45
Type: Oral Session: OG 2.3
Track: OG.2.3
The low-frequency peaked BL Lac (LBL) object BL Lacertae was observed with the MAGIC telescope from August to December 2005 (22.2 hrs), and from July to September 2006 (26.0 hrs). A very high energy (VHE) gamma-ray signal was discovered with a 5.1 sigma excess in the 2005 data. Above 200 GeV, an integral flux of approximate by 3% of the Crab flux was measured. The differential spectrum between ... More
Presented by Mr. Masaaki HAYASHIDA on 9 Jul 2007 at 09:30
Type: Oral Session: HE 1.1.A
Track: HE.1.1.A
Gamma-families were sampled for Pamir altitude (600g/cm2) by MC0 model with PCR spectra and composition proposed by KASCADE. Comparison of the calculated and Pamir experimental data on the gamma-families characteristics ( energy spectra of particles, summary energy spectra of particles and intensity of families) shows contradiction between them
Presented by Dr. V.G. DENISOVA on 9 Jul 2007 at 10:30
Type: Oral Session: HE 3.3
Track: HE.3.3
The nearby dwarf spheroidal galaxy Draco with its high mass to light ratio is a promising target for indirect dark matter (DM) searches. It is located at a distance of about 82 kpc, at the edge of the Milky Way. The dwarf galaxy is enclosed by a DM halo where the DM particle may annihilate and produce an observable gamma-ray flux. Among the different DM particle candidates the lightest supers ... More
Presented by M. RISSI on 10 Jul 2007 at 11:18
Type: Oral Session: HE 1.1.B
Track: HE.1.1.B
It is shown that EAS longitudinal development has a critical point where an equilibrium between the main hadronic component and the secondary electromagnetic one is broken. This results in a change of slope in quasi-power law function Ne(Eo). The latter leads to a knee in the EAS size spectrum at primary energy of about 100 TeV/nucleon at sea level.
Presented by Dr. Yuri STENKIN on 9 Jul 2007 at 11:35
Type: Poster Session: Posters 2 + Coffee
Track: HE.1.5 Board #: 022 (2A)
Radio electric field strengths associated with extensive air shower can be evaluated at large impact parameter with analytical expressions. Such a theoretical tool is most valuable in the present stage of development of the radio detection technique when the capabilities of the latter for comic-ray physics are under investigations. It provides a manageable tool which can help in devising ... More
Presented by Thierry GOUSSET on 6 Jul 2007 at 14:45
Type: Poster Session: Posters 1 + Coffee
Track: HE.1.4.A Board #: 016 (1B)
The scale and scope of the physics studied at the Auger Observatory offer significant opportunities for original outreach work. Education, outreach and public relations of the Auger collaboration are coordinated in a separate task whose goals are to encourage and support a wide range of education and outreach efforts that link schools and the public with the Auger scientists and the science of ... More
Presented by Prof. Gregory SNOW on 4 Jul 2007 at 14:45
Type: Poster Session: Posters 1 + Coffee
Track: OG.1.5 Board #: 113 (6A)
The balloon-borne Cosmic Ray Energetics And Mass (CREAM) investigation is designed to make direct measurements of high energy cosmic-ray particles at the top of the atmosphere. The Silicon Charge Detector (SCD) provides charge measurements of all primary particles from protons to iron nuclei. As the SCD is mounted above the calorimeter, albedo particles backscattered from the calorimeter ... More
Presented by J. YANG on 4 Jul 2007 at 14:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.4 Board #: 002 (1A)
Energy spectra of hadron cascade showers produced by the cosmic ray muons travelling through water and the muon integral spectra underwater at the depth up to 4 km are calculated with two models of muon inelastic scattering on nuclei, the recent hybrid model (two-component, 2C) as well as the well-known generalized vector-meson-dominance (GVMD) model for the comparison. The 2C model involv ... More
Presented by Prof. Akeo MISAKI on 9 Jul 2007 at 14:45
Type: Poster Session: Posters 2 + Coffee
Track: SH.3.6 Board #: 212 (11A)
The effect of energetic solar protons on the middle atmosphere (20-80 km ) chemical composition during SPE 13 December, 2006 has been studied. The solar proton spectra were obtained from the neutron monitors, balloons and spacecraft data. One-dimensional time-dependent model (Fadel et al., 2006, ASR, 38, p.1881-1886) has been used to calculate the production and loss of minor atmospheric ... More
Presented by Dr. Andrey KIRILLOV on 6 Jul 2007 at 14:45
Type: Oral Session: SH 3.1
Track: SH.3.1
At low energies, cosmic-ray nuclei experience the adiabatic limit where their intensity becomes proportional to their kinetic energy per nucleon, independent of the diffusion tensor and interstellar spectrum. Low-energy electrons, on the other hand, do react to changes in the diffusion tensor and are therefore ideal probes of its spatial- and rigidity dependence. To construct a diffusion t ... More
Presented by Prof. Renier BURGER on 9 Jul 2007 at 08:42
Type: Poster Session: Posters 2 + Coffee
Track: HE.1.5 Board #: 073 (4A)
IceCube data acquisition system is capable of recording information about all photons registered by its photomultiplier tubes for up to 13 microseconds for each sensor with high precision. The time resolution of 3 ns and charge resolution of 30% of all 1 photoelecton pulses within each sensor’s event record is achieved. The first atmospheric neutrino analysis did not take full advantage of t ... More
Presented by Dr. Dmitry CHIRKIN on 6 Jul 2007 at 14:45
Type: Oral Session: OG 1.4
Track: OG.1.4
We consider the effect of pre-existing turbulent fluctuations in the fluid upstream of a propagating hydromagnetic shock wave, in the limit of high enough Alf\'en mach number that the magnetic field stresses can be neglected. We find the expected effects on transverse diffusion, and show that particles can be readily accelerated up to the knee in the spectrum at a perpendicular shock. ... More
Presented by Prof. Jack (Randy) JOKIPII on 5 Jul 2007 at 13:17
Type: Oral Session: SH 5.3
Track: SH.5.3
Voyager 1 observations at the termination shock and in the heliosheath revealed new phenomena which required rethinking of some of our established paradigms. Very important among the new factors is the temporal and probably spatial variations which produce a number of effects which affect the energetic-particle spectra, anisotropies and their time variations observed at Voyager1. ... More
Presented by Prof. Jack (Randy) JOKIPII on 10 Jul 2007 at 12:29
Type: Oral Session: SH 1.8
Track: SH.1.8
It is known from long ago that solar energetic charged particles, driven by the geomagnetic field, are able to produce ionization at different altitudes of the terrestrial atmosphere. Moreover, they can initiate catalytic cycles for the ozone depletion, involving NOx (N+NO+NO2) and HOx (H, OH, HO2) components. Nevertheless, only in recent years it was possible to compare chemical models ... More
Presented by Dr. MARISA STORINI on 6 Jul 2007 at 12:53
Type: Poster Session: Posters 1 + Coffee
Track: HE.1.4.B Board #: 057 (3B)
In order to investigate the effects of the fluorescence energy error distributions on the determination of the ultra high energy cosmic ray (UHECR) spectrum we developed a Monte Carlo simulation of fluorescence telescopes using the HiRes and Auger telescopes as examples. We show that the energy error distribution (EED) for this kind of detector cannot be adequately represented by Gaussian or ... More
Presented by Mr. Washington, Jr. CARVALHO on 4 Jul 2007 at 14:45
Type: Poster Session: Posters 2 + Coffee
Track: SH.3.6 Board #: 214 (11A)
The effects of electric thunderstorms on the electromagnetic and muon components of the cosmic ray secondary flux were studied during severe storms in 2004 and part of 2005 analyzing the variations of the counting rates shown in the upper and lower scintillators of the muon telescope installed in Mexico City. Results show that for positive configurations of the electric field soft compon ... More
Presented by Mr. Jesús ALVAREZ CASTILLO on 6 Jul 2007 at 14:45
Type: Poster Session: Posters 2 + Coffee
Track: HE.1.5 Board #: 078 (4B)
We discuss discrimination techniques and their quantitative efficiency that allow the separation of high energy electron/photon and muon primaries originated in cosmic ray extensive air showers impinging the ground. The experimental setup used in this study is detailed elsewhere in this volume (Sanchez et al.). Several approaches are analyzed, including track timing, footprint characterization ... More
Presented by Mr. Federico SANCHEZ on 6 Jul 2007 at 14:45
Type: Oral Session: OG 1.4+2.2
Track: OG.1.4
Electron injection process at high Mach number collisionless quasiperpendicular shock waves is investigated by means of one-dimensional electromagnetic particle-in-cell simulations. We find that energetic electrons are generated through the following two steps: (1) electrons are accelerated nearly perpendicular to the local magnetic field by shock surfing acceleration at the leading edge of th ... More
Presented by Mr. Takanobu AMANO on 7 Jul 2007 at 08:42
Type: Poster Session: Posters 1 + Coffee
Track: HE.1.3.A Board #: 043 (3A)
KASCADE-Grande, located at Forschungszentrum Karlsruhe, is a multi detector experiment for the measurement of extensive air showers induced by primary cosmic rays in the energy range of $10^{14}-10^{18}$ eV. With its 0.5 km$^2$ large field detector, in combination with the muon detectors of the KASCADE array, it allows the reconstruction of both the total electron and muon numbers, which are ... More
Presented by Dr. - - on 4 Jul 2007 at 14:45
Type: Poster Session: Posters 3 + Coffee
Track: SH.3.1 Board #: 178 (9A)
The COSPIN/KET experiment on board the Ulysses spacecraft has been observing the flux of 3-30 MeV and also higher energy electrons in the inner heliosphere (radial distances > 5.2 AU) since its launch in 1990. These observations have indicated the presence of low-energy electrons with a strong anisotropy off the equatorial plane as far as 2.2 AU from Jupiter. This was observed during Uly ... More
Presented by Prof. Marius POTGIETER on 9 Jul 2007 at 14:45
Type: Poster Session: Posters 2 + Coffee
Track: HE.1.5 Board #: 082 (4B)
Field programmable gate arrays (FPGAs) are playing an increasing role in DAQ systems in cosmic ray experiments due to their high speed and integration and their low cost and low power comsumption. In this paper we describe in detail the new electronics and data acquisition system based on FPGA boards of the extensive air shower detector array built in the Campus of the University of Puebla. T ... More
Presented by Dr. Luis VILLASENOR on 6 Jul 2007 at 14:45
Type: Oral Session: OG 1.1
Track: OG.1.1
The Cosmic Ray Energetics And Mass (CREAM) instrument is a balloon-borne experiment designed to measure the composition and energy spectra of cosmic rays of charge Z = 1 to 26 up to an energy of ~ 10^15 eV. CREAM had two successful flights on long-duration balloons (LDB) launched from McMurdo Station, Antarctica, in December 2004 (CREAM-I) and December 2005. CREAM-I achieves a substantial me ... More
Presented by Dr. Hoseok AHN on 4 Jul 2007 at 08:42
Type: Oral Session: SH 1.2, SH 1.3
Track: SH.1.3
Strong signals of energetic neutrons associated with the solar flare of 7 September 2005 were detected by using the Solar Neutron Telescopes located at Mt. Chacaltaya in Bolivia and Mt. Sierra Negra in Mexico, Neutron Monitors located at Mt. Chacartaya and Mexico City. The observed profiles indicate a continuous emission of neutrons. In this paper, we present the results of combined anal ... More
Presented by Dr. Takashi SAKO on 4 Jul 2007 at 09:30
Type: Poster Session: Posters 2 + Coffee
Track: OG.2.2 Board #: 172 (9A)
We study non-thermal emissions by relativistic electrons from supernova remnants(SNRs) in the presence of small-scale random and large-scale regular magnetic fields. We extend our pure jitter and inverse Compton emission models (Ogasawara et al. 2006) and construct the emission models with regular magnetic fields. We apply them to the multi-wavelength data of TeV gamma-ray sources SNRs RX J1 ... More
Presented by Dr. Tatsuo YOSHIDA on 6 Jul 2007 at 14:45
Type: Poster Session: Posters 1 + Coffee
Track: SH.1.4 Board #: 188 (10A)
In order to fit observational data of solar particle charge states, two different models have been developed, to study the evolution of charge during their source acceleration. :(1) on basis to high energy electron loss and capture cross sections, from laboratory experiments in atomic and ionized hydrogen gases, under the assumption of an interaction process of two different populat ... More
Presented by Prof. JORGE PEREZ-PERAZA on 4 Jul 2007 at 14:45
Type: Oral Session: SH 3.5,SH 5.1, SH 5.2
Track: SH.5.2
Since 1996, energetic hydrogen and helium atoms (ENAs) have been identified and their fluxes are monitored by the High-Energy Suprathermal Time-of-Flight sensor (HSTOF) of the Charge, Element, and Isotope Analysis System (CELIAS) on the Solar and Heliospheric Observatory (SOHO) near the Lagrangian point L1. ENAs, neutralized via charge transfer reactions, move along ballistic trajectories una ... More
Presented by Martin HILCHENBACH on 10 Jul 2007 at 11:30
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 150 (8A)
In this contribution we discuss the possibility of using the observations by GLAST of standard gamma sources, as the Crab Nebula or Vela and some selected AGNs, to calibrate the Imaging Air Cherenkov detectors and improve their energy resolution. Results of the calibration technique can possibly be used to discriminate between VHE gamma-rays emitted by the Nebula and by the inner pulsar ... More
Presented by Dr. Denis BASTIERI on 9 Jul 2007 at 14:45
Type: Oral Session: OG 2.2
Track: OG.2.2
Observations with H.E.S.S. in 2004-2005 revealed a new source of very high-energy (VHE) gamma-rays above 100 GeV -- HESS J1825-137 -- extending mainly to the south of the energetic pulsar PSR B1823-13. While the direction of the VHE gamma-ray emission with respect to the pulsar is similar to that of the asymmetric X-ray PWN G18.0-0.2 in this system, the RMS extension of HESS J1825--137 is >0.2 ... More
Presented by Dr. Stefan FUNK on 6 Jul 2007 at 09:06
Type: Poster Session: Posters 1 + Coffee
Track: OG.1.1 Board #: 140 (7B)
The Balloon-borne Experiment with a Superconducting Spectrometer (BESS) was flown eight times from Lynn Lake, Manitoba, Canada between 1993 and 2002. The performance of the instrument was improved with essentially each successive flight, and precise spectral measurements of cosmic-ray hydrogen and helium isotopes were made during different phases of the solar modulation. This paper prese ... More
Presented by Eun-Suk SEO on 4 Jul 2007 at 14:45
Type: Oral Session: OG 2.2
Track: OG.2.2
The Crab is a standard calibration source for TeV gamma ray astronomy. Its energy spectrum extends beyond 10s of TeV, however, an open question is does the spectrum cutoff and at what energy. We present new results from Milagro analysis of the energy spectrum of the Crab nebula up to 100 TeV with good statistical determination. A robust algorithm was developed to estimate the energies of gam ... More
Presented by Prof. Gaurang YODH on 6 Jul 2007 at 11:18
Type: Oral Session: OG 1.5
Track: OG.1.5
The Cosmic Ray Energetics and Mass (CREAM) balloon experiment had two successful flights in 2004/05 and 2005/06. It was designed to perform energy measurements from a few GeV up to 1000 TeV, taking advantage of different detection techniques. The first instrument, CREAM-I, combined a transition radiation detector (equipped with an array of proportional tubes and an acrylic Cherenkov device) w ... More
Presented by Dr. Paolo MAESTRO, Riccardo ZEI on 6 Jul 2007 at 12:17
Type: Oral Session: HE 1.5
Track: HE.1.5
In the fluorescence detection of ultra high energy ($\gtrsim 10^{18}$ eV) cosmic rays, it is assumed that the number of emitted fluorescence photons is proportional to the energy deposited in air by shower particles. We have performed measurements of the fluorescence yield in atmospheric gases excited by electrons over a wide energy range. AIRFLY has collected data between 1 and 3 MeV at a Va ... More
Presented by Dr. Lorenzo CAZON on 10 Jul 2007 at 12:17
Type: Oral Session: SH 1.5, SH 1.6
Track: SH.1.6
Normalized cumulative particle fluence plots are very useful for characterizing the variability of interplanetary suprathermal and energetic particle fluxes on various time scales. For some applications it is practicable to describe the deviations of annual fluence plots from straight lines by a single parameter (the Kolmogorov or K parameter), and then check the dependence of that parameter o ... More
Presented by Péter KIRÁLY on 5 Jul 2007 at 09:06
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.3 Board #: 068 (4A)
Extremely high energy (EHE) cosmic rays are expected to interact with cosmic microwave photons and generate EHE neutrinos (>10PeV). The IceCube telescope can detect the EHE neutrinos due to its large effective volume, although the expected flux is much lower than the huge flux of atmospheric background muons at lower energies. Therefore, reconstruction of the track geometry and especially t ... More
Presented by Dr. David BOERSMA on 9 Jul 2007 at 14:45
Type: Oral Session: OG 1.1
Track: OG.1.1
We have observed cosmic-ray electrons from 10GeV to 1TeV with PPB-BETS by a long duration balloon flight using Polar Patrol Balloon (PPB) in Antarctica. The observation was carried out for 13 days at an altitude of 35 km in January 2004. The detector is an imaging calorimeter composed of scintillating-fiber belts and plastic scintillators inserted between lead plates. The geometrical factor ... More
Presented by Dr. Kenji YOSHIDA on 4 Jul 2007 at 11:30
Type: Poster Session: Posters 1 + Coffee
Track: SH.1.3 Board #: 198 (10B)
The Solar Neutron Telescope (SNT) at Mt. Sierra Negra in Mexico (19.0°N, 97.3°W) is taking data since June of 2004. A solar neutron event was registered by this SNT, associated with the flare of September 7 of 2005, at the minimum phase of solar cycle 23. In this work we calculate the energy spectrum for this solar neutron event, using the attenuation model by Dorman & Valdés-Galicia (J. G ... More
Presented by Dr. Luis Xavier GONZÁLEZ on 4 Jul 2007 at 14:45
Type: Oral Session: OG 1.1
Track: OG.1.1
A recently proposed novel technique for the detection of cosmic rays with arrays of Imaging Atmospheric Cherenkov Telescopes is applied to data from the High Energy Stereoscopic System (H.E.S.S.). The method relies on the ground based detection of Cherenkov light emitted from the primary particle prior to its first interaction in the atmosphere. The charge of the primary particle (Z) can be es ... More
Presented by Mr. Rolf BUEHLER on 4 Jul 2007 at 10:54
Type: Oral Session: OG 2.2, OG 2.1
Track: OG.2.2
Recently, advances in VHE instrumentation have made the discovery of many new, predominantly Galactic, sources possible. Of these, a significant number can be identified as pulsar wind nebulae. It has long been known that pulsars can drive powerful winds of highly relativistic particles. These winds end in a termination shock from which high-energy particles with a wide spectrum of energies em ... More
Presented by Svenja CARRIGAN on 7 Jul 2007 at 12:41
Type: Oral Session: OG 1.2
Track: OG.1.2
Energy spectra and chemical composition of the primary cosmic ray nuclei for energies higher than 1 PeV are obtained mainly from measurements of intensities and various properties of extensive air showers. Additional and importent data from the study of gamma ray families are available in addition. In bouth cases we have informations from the range of very high fluctuations. An importent fact ... More
Presented by Prof. Janusz KEMPA on 4 Jul 2007 at 12:05
Type: Oral Session: OG 1.2
Track: OG.1.2
The Ursa Major (UM) cluster of UHECRs consists of 5 events in the combined HiRes-AGASA sample above 10 EeV which are consistent with coming from a single point source, with little magnetic deflection. The probability of finding the cluster of 4 highest energy events by chance is about 2 10^-3; the probability that the 5th low energy event is a chance correlation, given the size of the low ene ... More
Presented by Prof. Glennys FARRAR on 4 Jul 2007 at 13:17
Type: Oral Session: HE 1.2.A
Track: HE.1.2.A
The dependence of the intensity of muon bundles detected at the Earth's surface by means of the coordinate-tracking detector DECOR on the angle between muon arrival direction and geomagnetic field vector (pitch angle) has been analysed. It is found that muon bundle intensity decreases with the increase of the transverse component of the magnetic field in comparison with calculations performed ... More
Presented by Dr. Igor YASHIN on 6 Jul 2007 at 11:06
Type: Poster Session: Posters 3 + Coffee
Track: HE.3.4 Board #: 044 (3A)
The IceCube neutrino observatory, currently under construction at the South Pole, offers a novel environment to search for particles beyond the Standard Model. With IceCube nearly 20% complete it is currently the largest neutrino telescope. The large instrumented volume and relatively clear glacial ice allows for the improvement of detection limits (in the absence of discovery) on many types o ... More
Presented by Dr. Alexander OLIVAS on 9 Jul 2007 at 14:45
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 122 (6B)
As described in a paper (S.Torii et al) of this conference, CALET is a versatile detector for exploring high energy universe by observing gamma rays (>20 MeV), electrons (>GeV) and other charged particles (>100GeV). It is planned to be on board the JEM (Japanese Experiment Module, Kibo) of the International Space Station. We study its basic performance by M.C simulations. Th ... More
Presented by Prof. katsuaki kasahara KASAHARA on 9 Jul 2007 at 14:45
Type: Oral Session: OG 2.7
Track: OG.2.7
GAW is a research and development project to test the feasibility of a new generation of Imaging Atmospheric Cherenkov Telescopes suitable for large field observations. GAW is defined as an array of three identical imaging Cherenkov telescopes posed at the vertexes of a quasi-equilateral triangle, 80m side. Each telescope is equipped with a refractive optics consisting of a 2.13m diameter ... More
Presented by Dr. Maria Concetta MACCARONE on 9 Jul 2007 at 11:06
Type: Oral Session: HE 2.3
Track: HE.2.3
The ANTARES telescope is being built in the Mediterranean Sea. The detector consists of a 3D array of photomultipliers (PMTs) that detects the Cherenkov light induced by the muons produced in neutrino interactions. Since the neutrino fluxes from point-like sources are expected to be small, it is of the utmost importance to take advantage of the ANTARES accurate pointing power (angular resolut ... More
Presented by Mr. Juan Antonio AGUILAR SÁNCHEZ on 5 Jul 2007 at 08:53
Type: Poster Session: Posters 2 + Coffee
Track: HE.1.5 Board #: 025 (2A)
New SPHERE-2 detector basic parameters are described. New calorimetric method is used to study the primary cosmic rays energy spectrum and chemical composition at energy region 10 PeV - 1 EeV. The method is practically independent of the particle interaction model. Results of CORSIKA simulation of detector are presented. Lifted by tied balloon to the 1 km altitude detector will detect EAS ... More
Presented by Dr. Dmitry CHERNOV on 6 Jul 2007 at 14:45
Type: Poster Session: Posters 2 + Coffee
Track: HE.1.5 Board #: 070 (4A)
The thin target mode of the FLASH (Fluorescence in Air from Showers) experiment was conducted at SLAC. The aim was to measure the total and spectrally resolved fluorescence yield of charged particles traveling through air to better than 10%. The setup consisted of a 15.24 cm thick gas volume which was viewed by two PMT detectors each equipped with 15 remotely interchangeable narrow band ... More
Presented by Dr. Petra HUENTEMEYER on 6 Jul 2007 at 14:45
Type: Poster Session: Posters 2 + Coffee
Track: HE.1.5 Board #: 069 (4A)
Having high-resolution UV spectra produced from EAS fluorescence, one can determine in a more accurate way the effects of atmospheric attenuation of these signals by including Rayleigh, Mie-scattering as well as resonance absorption inside the atmosphere. For this reason, we developed an experimental setup for emulating the air-fluorescence using high-resolution spectroscopy in the UV r ... More
Presented by Mr. Stavros MALTEZOS on 6 Jul 2007 at 14:45
Type: Oral Session: HE 1.4.A
Track: HE.1.4.A
Extensive air showers of cosmic rays ultra-high energy without muon component registered by the Yakutsk array have been analysed. Among them we found some clusters and these clusters correlate with pulsars. The problem of origin showers without muons and the chemical composition of cosmic rays are discussed.
Presented by Dr. Alexei MIKHAILOV on 7 Jul 2007 at 13:17
Type: Poster Session: Posters 2 + Coffee
Track: HE.1.6 Board #: 009 (1A)
The phenomenon of alignment of most energetic structures of gamma-ray-hadron families found in mountain and stratospheric X-ray - emulsion chamber experiments cannot be explained without a coplanar particle generation with large transverse momenta in hadron interactions at superhigh energies. A phenomenological model, which makes it possible to simulate such interactions, is presented. Differe ... More
Presented by Prof. Rauf MUKHAMEDSHIN on 6 Jul 2007 at 14:45
Type: Poster Session: Posters 1 + Coffee
Track: SH.1.6 Board #: 158 (8B)
According to the time variations of the cosmic ray (CR) rigidity spectrum parameters the dynamic processes are researched in the interplanetary space, and it is found that the variation of electromagnetic characteristics of heliosphere begins before the sporadic phenomena on the Sun. In particular, it is shown that before the sporadic phenomena the decrease of generation of local polariz ... More
Presented by Dr. Olga KRYAKUNOVA on 4 Jul 2007 at 14:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.4 Board #: 082 (4B)
Several experimental works demonstrate the possibility of observation of shadows of the Moon and the Sun for the mean energy of primaries higher than 1 TeV. Calculations are presented to demonstrate the feasibility of Moon shadow observations for mean primary energies in the region 0.5-1 TeV in a muon detector operating under the Pyramid of the Sun at Teotihuacan, Mexico. Due to the relatively ... More
Presented by Dr. Varlen GRABSKI on 9 Jul 2007 at 14:45
Type: Oral Session: HE 2.5
Track: HE.2.5
Astrophysical neutrinos in the EeV range (particularly those generated by the interaction of cosmic rays with the microwave background) promise to be a valuable tool to study astrophysics and particle physics at the highest energies. Much could be learned from temporal, spectral, and angular distributions of ~100 events, which could be collected by a detector with ~100 km^3 effective volume i ... More
Presented by Mr. Justin VANDENBROUCKE on 7 Jul 2007 at 11:18
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.5 Board #: 074 (4B)
The South Pole Acoustic Test Setup (SPATS) has been built to evaluate the acoustic characteristics of the Antarctic ice in the 10 to 100 kHz frequency range so that the feasibility and specific design of an acoustic neutrino detection array at South Pole can be evaluated. SPATS consists of three vertical strings that have been deployed in the upper 400 meter of the Antarctic ice cap in Jan ... More
Presented by Ms. Freija DESCAMPS on 9 Jul 2007 at 14:45
Type: Oral Session: HE 1.6
Track: HE.1.6
Using our new Monte Carlo code REAS2, geosynchrotron radio emission from extensive air showers can now be calculated on the basis of individual high quality CORSIKA-simulated showers. We present an analysis of the radio emission properties predicted by REAS2, with particular focus on shower to shower fluctuations and primary particle composition effects which can now for the first time b ... More
Presented by Dr. Tim HUEGE on 5 Jul 2007 at 11:30
Type: Oral Session: HE 1.3.A
Track: HE.1.3.A
For the conditions of KASCADE-Grande the lateral particle density at about 500 m distance from the shower core S(500) has been shown by detailed simulation studies to be an approximate energy estimator, being nearly independent of the mass of the primary particle. This report presents some features of the S(500) observable of EAS registered with the KASCADE-Grande array installed at Forschungs ... More
Presented by Dr. Iliana BRANCUS on 6 Jul 2007 at 13:18
Type: Oral Session: HE 1.5
Track: HE.1.5
The Cern Neutrinos to Gran Sasso (CNGS) project aims to produce a high energy, wide band muon neutrino beam at Cern and send it towards the INFN Gran Sasso National Laboratory (LNGS). Its main goal is the observation of the tau neutrino appearance. The beam started its operation in August 2006: a total amount of $7.6~10^ {17}$ protons were delivered to the target. The LVD detector, instal ... More
Presented by Gabriella SARTORELLI on 10 Jul 2007 at 10:30
Type: Poster Session: Posters 2 + Coffee
Track: HE.1.5 Board #: 064 (4A)
The Moon based observation of cosmic rays must be part of the complete program at the forefront of the space science and technology of the set of Moon based observatories that will operate on the Moon in the next few decades. When compared with the cost of a dedicated vehicle and its launch, the installation of CR experiments on the Moon, in a suitable equipped location, compensates for ... More
Presented by Prof. Piero SPILLANTINI on 6 Jul 2007 at 14:45
Type: Oral Session: OG 2.7
Track: OG.2.7
The central array of the ARGO detector at the YangBaJing Cosmic Ray Laboratory (4300 m a.s.l., Tibet, P.R. China) has been put into operation for physics runs. It is made of 130 identical sub-units of 12 RPCs each ('cluster') covering a surface of about 5800 m**2 with 92% active area. Signals are picked-up by external electrodes of small size, thus allowing the sampling of EAS with high space ... More
Presented by Dr. Daniele MARTELLO on 9 Jul 2007 at 09:42
Type: Poster Session: Posters 1 + Coffee
Track: SH.2.1 Board #: 194 (10A)
A new Muon Spaceweather Telescope for Anisotropies dedicated to spaceweather forecast is presently under construction in Greifswald (MuSTAnG), Germany. MuSTAnG in its present configuration consists of 8 m2 (2 x 4 m2) of scintillator plates in 2 layers. Each scintillator plate has a size of 0.25 m2 and is connected via wavelength-shifting fibres to a photomultiplier unit with integrated high-v ... More
Presented by Prof. Rainer HIPPLER on 4 Jul 2007 at 14:45
Type: Oral Session: HE 1.4.A
Track: HE.1.4.A
When high-energy cosmic rays impinge on a dense dielectric medium, radio waves are produced through the Askaryan effect. At wavelengths comparable to the typical longitudinal size of showers produced by Ultra-High Energy cosmic rays or neutrinos, radio signals are an extremely efficient way to detect these particles [1]. These can be detected using the Westerbork Synthesis Radio Telescope (WS ... More
Presented by Olaf SCHOLTEN on 7 Jul 2007 at 12:53
Type: Poster Session: Posters 2 + Coffee
Track: OG.2.3 Board #: 151 (8A)
Multiwavelength observations provide valuable information to estimate the physical parameters of AGN emission models. Since blazars show a strong flux variability, it is important to derive these physical parameters in the different states in order to understand the acceleration mechanism and in the jet. So far simultaneous blazar observations in X-rays and VHE gamma-rays could only be perfo ... More
Presented by Mr. Masaaki HAYASHIDA on 6 Jul 2007 at 14:45
Type: Oral Session: HE 1.5
Track: HE.1.5
The yield of fluorescence photons in an extensive air shower allows the observer to determine the number of shower particles by measuring the number of photons produced. As the systematic uncertainties in both ground array and fluorescence detectors improve our need to better understand this calibration is required. Additionally, as more sensitive fluorescence detectors observe further into t ... More
Presented by Dr. Kevin REIL, Dr. Petra HUENTEMEYER on 10 Jul 2007 at 09:06
Type: Poster Session: Posters 2 + Coffee
Track: HE.1.5 Board #: 027 (2A)
Photon yields in moist air are measured with Sr90 beta source and compared with those in dry air. Considerable reduce in the photon yields is found due to water vapor. Since the ultrahigh energy cosmic ray observatories (HiRes, Auger, TA) with fluorescence technique on ground are at high altitude, the effect of the water vapor may be negligible. However, for the experiments from space like ... More
Presented by Dr. Naoto SAKAKI on 6 Jul 2007 at 14:45
Type: Oral Session: SH 3.6
Track: SH.3.6
By the solar flare, a large number of solar protons are usually accelerated into high energies. When the intensities of solar protons are very strong, they are observed as a phenomenon, the Ground Level Enhancement (GLE). However, it is used to be reported in the cosmic ray conferences how much percentage they increased in comparison with the flux of the galactic cosmic rays. In order t ... More
Presented by Prof. Yasushi MURAKI on 7 Jul 2007 at 08:42
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 123 (6B)
VERITAS is a new atmospheric Cherenkov imaging telescope array to detect very high energy gamma rays above 100 GeV. The array is located in southern Arizona, USA, at an altitude of 1270m above see level. The array currently consists of four 12 m telescopes, structurally resembling the Davis-Cotton design of the Whipple 10 m telescope. The VERITAS focal plane instruments are equipped with ... More
Presented by Dr. Tomoyuki NAGAI on 9 Jul 2007 at 14:45
Type: Poster Session: Posters 1 + Coffee
Track: SH.2.1 Board #: 181 (9B)
Forbush decreases in relation to CME related shocks and solar wind disturbances. P.L. VERMA Department of Physics Govt. Vivekanand P.G. College Maihar Distt. Satna (M.P.) India ABSTRACT Coronal mass ejections (CMEs) are the most energetic events in the heliosphere and are widely recognized as being responsible for production of large disturbances in solar wind, t ... More
Presented by Dr. PL VERMA on 4 Jul 2007 at 14:45
Type: Oral Session: SH 2.1
Track: SH.2.1
We presented a statistical study of major Forbush decreases during the last decades, using cosmic ray data from ground based detectors -- neutron monitors and a muon detector. We show that, in addition to typical event (e.g., September 2005), there are several unusual Forbush decreases (e.g., November 2004), which depict unexpected features: (1) the recovery time of a Forbush decrease stron ... More
Presented by Dr. Ilya USOSKIN on 5 Jul 2007 at 13:17
Type: Poster Session: Posters 1 + Coffee
Track: SH.1.6 Board #: 197 (10B)
It is well known that energy spectrum of solar energetic particles (SEP), observed by ground based neutron monitors and muon telescopes (in high energy region; the transfer to the space from the ground observations is made by the method of coupling functions, see in [1], Chapter 3), and by detectors on satellites and space-probes (in small energy region) changed with time very much (usua ... More
Presented by Prof. Lev DORMAN on 4 Jul 2007 at 14:45
Type: Poster Session: Posters 2 + Coffee
Track: OG.2.2 Board #: 109 (6A)
Shell-type Supernova remnants (SNRs) have long been known to harbour a population of ultra-relativistic particles, accelerated in the Supernova shock wave by the mechanism of Diffusive shock acceleration. Experimental evidence for the existence of electrons up to energies of ~100 TeV was first provided by the detection of hard X-ray synchrotron emission as e.g. in the shell of the young SNR SN ... More
Presented by Dr. Stefan FUNK on 6 Jul 2007 at 14:45
Type: Oral Session: OG 2.7
Track: OG.2.7
The future of ground based gamma ray astronomy lies in large arrays of Imaging Atmospheric Cherenkov Telescopes (IACT) with better capabilities: lower energy threshold, higher sensitivity, better resolution and background rejection. Currently, designs for the next generation of IACT arrays are being explored by various groups. We have studied possible configurations with a large number of tele ... More
Presented by Ms. Saeeda SAJJAD on 10 Jul 2007 at 10:54
Type: Oral Session: OG 1.5
Track: OG.1.5
Although SNRs are theoretically considered to be the most plausible candidates for the acceleration of cosmic-ray hadrons up to PeV energies, no observations have succeeded in definitely specifying those objects so far. Since accelerated electrons have difficulty producing very high-energy gamma rays with energies above 100 TeV via bremsstrahlung or inverse Compton scattering, it can be an ef ... More
Presented by Mr. Takashi SAKO on 6 Jul 2007 at 13:17
Type: Poster Session: Posters 1 + Coffee
Track: OG.1.5 Board #: 101 (5B)
The Tibet air shower array, which has an effective area of 37,000 square meters and is located at 4300 m in altitude, has been observing air showers induced by cosmic rays with energies above a few TeV. We have a plan to add a large muon detector array to it for the purpose of increasing its sensitivity to cosmic gamma rays in the 100 TeV energy region by discriminating them from cosmic-ray h ... More
Presented by Mr. Takashi SAKO on 4 Jul 2007 at 14:45
Type: Oral Session: OG 2.7
Track: OG.2.7
GAW, acronym for Gamma Air Watch, is a Research and Development experiment in the TeV regime, whose main goal is to explore the feasibility of large field of view Imaging Atmospheric Cherenkov Telescopes. GAW is an array of three relatively Cherenkov telescopes (2.13 m diameter) which differentiate from the existing and presently planned projects for two main features: the adoption of a ... More
Presented by Dr. giancarlo CUSUMANO on 9 Jul 2007 at 10:54
Type: Poster Session: Posters 2 + Coffee
Track: SH.3.6 Board #: 183 (9B)
We report on the results of a preliminary study of the GCR-induced photon luminescence of the Moon using the Monte Carlo program FLUKA. The model of the lunar surface is taken to be the chemical composition of soils found at various landing sites during the Apollo and Luna programs, averaged over all such sites to define a generic regolith for the present analysis. This then becomes the ... More
Presented by Dr. Thomas WILSON on 6 Jul 2007 at 14:45
Type: Poster Session: Posters 1 + Coffee
Track: OG.1.5 Board #: 114 (6A)
The CREAM instrument is a balloon-borne detector designed to measure the cosmic-ray spectrum in the 1-1000TeV energy range, with good charge resolution from protons to iron (Z = 1 to 26). The CREAM instrument has had two successful flights, both from McMurdo Station, Antarctica. CREAM-I was flown in the 2004-2005 Antarctic summer campaign and CREAM-II in 2005-2006, with a combined flight durat ... More
Presented by Mr. Samuel MOGNET on 4 Jul 2007 at 14:45
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 149 (8A)
High-energy gamma-ray sources are inherently nonthermal, multiwavelength objects. With the launch of the Gamma-ray Large Area Space Telescope (GLAST) in late 2007, the GLAST Large Area Telescope (LAT) Collaboration invites cooperative efforts from observers at all wavelengths. Among the many topics where multiwavelength studies will maximize the scientific understanding, three stand out. (1) ... More
Presented by Dr. Jennifer CARSON on 9 Jul 2007 at 14:45
Type: Poster Session: Posters 2 + Coffee
Track: OG.2.3 Board #: 167 (8B)
The Large Area Telescope (LAT, 30 MeV < E < 300 GeV) aboard the Gamma-ray Large Area Space Telescope (GLAST), scheduled to launch in late 2007, promises a factor of ~30 increase in sensitivity over its predecessor, EGRET. It is expected that the LAT will detect over a thousand blazars in its first year, enabling the first detailed population studies of these gamma-ray sources. The LAT’s sens ... More
Presented by Dr. Jennifer CARSON on 6 Jul 2007 at 14:45
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 155 (8A)
The Gamma ray Large Area Space Telescope (GLAST) is the next-generation high energy gamma-ray astronomy mission, scheduled for launch in Fall 2007. The observatory comprises two instruments. The Large Area Telescope (LAT) will survey the sky in the energy range from 20 MeV to >300 GeV, while the GLAST Burst Monitor (GBM) will monitor gamma-ray bursts and other transients in the 10 keV to 25 M ... More
Presented by Mr. JOHANN COHEN-TANUGI on 9 Jul 2007 at 14:45
Type: Oral Session: SH 1.8
Track: SH.1.8
The latest GLE event (70th since 1942) was registered using neutron monitor net on December 13, 2006. The response of neutron monitors shows a sharp anisotropy of solar particle flux with direction close to the acceptance cone of MEPhI muon hodoscopes (Moscow). Analysis of the enhancement in muon ground level intensity measured by means of muon hodoscope URAGAN (MEPhI, Moscow) is present ... More
Presented by Dr. Dmitry TIMASHKOV on 6 Jul 2007 at 10:42
Type: Oral Session: HE 2.3
Track: HE.2.3
A method is presented for the identification of high-energy neutrinos from gamma ray bursts by means of a large-scale neutrino telescope. The procedure makes use of a time profile stacking technique of observed neutrino induced signals in correlation with satellite observations. By selecting a rather wide time window, a possible difference between the arrival times of the gamma and neutrino ... More
Presented by Dr. Nick VAN EIJNDHOVEN on 5 Jul 2007 at 13:08
Type: Poster Session: Posters 2 + Coffee
Track: OG.2.4 Board #: 152 (8A)
Spectral properties of some GRB with presence of high energy component within RHESSI, HETE and SWIFT t90 intervals are discussed. In some cases the temporal profiles of GRB in low and high energy bands are similar but in some cases they are different and maxima are not coincide. We found the same type GRB in CGRO database too – for example, GRB930131. Moreover, for some GRB from ... More
Presented by Dr. Leonid MIROSHNICHENKO on 6 Jul 2007 at 14:45
Type: Poster Session: Posters 3 + Coffee
Track: SH.3.3 Board #: 165 (8B)
The spatial distribution of galactic cosmic rays in the heliosphere at solar maximum of Cycles 21, 22 and 23 are studied using a one dimensional model of the cosmic ray transport equation. We investigated the radial intensity gradients from 1 AU to the distant heliosphere and interpreted the data from IMP8, Voyagers 1/2, Pioneer 10 and balloon experiment BESS. In our model we considered ... More
Presented by Oscar G. MORALES-OLIVARES on 9 Jul 2007 at 14:45
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.5 Board #: 152 (8A)
We use a diffusive model for the propagation of Galactic cosmic rays to estimate the charged meson production in interactions with protons of the interstellar medium. Cosmic ray nuclei from proton to iron are considered and the corresponding contribution to the neutrino secondary flux produced as a result of spallation is also estimated. The contribution from nearby Galaxies to the all sky neu ... More
Presented by Cinzia DE DONATO on 9 Jul 2007 at 14:45
Type: Oral Session: OG 1.2, OG 1.3
Track: OG.1.3
Based on the cosmic-ray (CR) data currently available, we estimate the gas density, diffusion coefficient, and their spacial gradient in both the longitudinal and the latitudinal directions in the Galaxy. Applying our model on the three dimensional CR propagation for various CR observables such as stable nuclear components, isotopes, antiprotons, diffuse gamma-rays, we present analytical ... More
Presented by Prof. Toru SHIBATA on 5 Jul 2007 at 11:30
Type: Poster Session: Posters 2 + Coffee
Track: OG.2.2 Board #: 089 (5A)
The new galactic gamma-source neutron star 2129+47XR is detected at energy >0.8TeV with flux (0.19\pm0.9)×10^{-12}cm^{-2}s^{-1} and index of the integral spectrum is kγ = -1.05\pm0.10. Cygnus X-3 is peculiar X-ray binary system discovered about 40 years ago. The system has been observed throughout wide range of the electromagnetic spectrum. It is one of the brightest Galactic X-ray sources ... More
Presented by Vera Yurievna SINITSYNA on 6 Jul 2007 at 14:45
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 141 (7B)
GAW proposes a new approach for the detection and measurement of the Cherenkov light produced by GeV/TeV gamma rays traversing the Earth atmosphere which imposes specific requirements on the electronics design. The focal surface of the GAW telescope consists of a matrix of multi-anode photomultipliers. The large number of active channels (of the order of 104) makes it basically a large UV sens ... More
Presented by Pedro ASSIS on 9 Jul 2007 at 14:45
Type: Poster Session: Posters 2 + Coffee
Track: OG.2.3 Board #: 121 (6B)
By using Egret data, considering a gamma ray flux for Virgo suppercluster and a detailed analysis on our postulates, with a new methode a gamma ray flux in Coma direction reasults. some analogy between the works has made, is done. a flux index for Coma direction gamma rays has resulted which is in the favor of our information from Coma supercluster.
Presented by Mrs. Pantea DAVOUDIFAR on 6 Jul 2007 at 14:45
Type: Oral Session: OG 2.2, OG 2.1
Track: OG.2.2
The Gamma-ray Large Area Space Telescope (GLAST) will be launched less than a year from now, and its Large Area Telescope (LAT) is expected to discover scores to hundreds of gamma-ray pulsars. This poster discusses which of the over 1700 known pulsars, mostly visible only at radio frequencies, are likely to emit >100 MeV gamma-rays with intensities detectable by the LAT. The main figure of mer ... More
Presented by Mrs. Marianne LEMOINE-GOUMARD on 7 Jul 2007 at 12:05
Type: Poster Session: Posters 2 + Coffee
Track: OG.2.2 Board #: 142 (7B)
Young rotating neutron stars (pulsars) are considered as strong sources of TeV muon neutrinos, which are produced through the delta resonance in proton- gamma photon interactions. In this presentation it is shown that the observed upper limit of gamma ray fluxes from the young pulsars put limit on fluxes of muon neutrinos from the sources.
Presented by Dr. Arunava BHADRA on 6 Jul 2007 at 14:45
Type: Oral Session: OG 2.1, OG 2.2
Track: OG.2.2
Recent results from the HESS gamma-ray telescope have shown the presence of both a diffuse, extended flux of gamma rays above ~0.4 TeV and discrete sources in and near the Galactic Centre. Here, we put forward a possible explanation in terms of the diffusion of cosmic-ray protons from a succession of supernova remnants ( SNR ) in the SgrA* region of the Galaxy plus a probable contribution from ... More
Presented by Prof. Anatoly ERLYKIN on 4 Jul 2007 at 08:42
Type: Poster Session: Posters 2 + Coffee
Track: OG.2.2 Board #: 092 (5A)
In this work we consider the situation in which the pulsar (and its nebula) is formed inside or close to the high density regions of a molecular cloud. Recent models for the gamma radiation of pulsar wind nebula try to include not only radiation processes due to the injected leptons but also processes due to injection of relativistic hadrons into the nebula. Hadrons accelerated during the life ... More
Presented by Dr. Hendrik BARTKO on 6 Jul 2007 at 14:45
Type: Poster Session: Posters 2 + Coffee
Track: HE.1.5 Board #: 032 (2B)
Measurements at 100 TeV and above are an important goal for the next generation of high energy $\gamma$-ray astronomy experiments. In fact, the high energy end of $\gamma$-ray source spectra might provide clear discrimination between electron and hadron processes, thus allowing the identification of cosmic "PeVatrons", the sites of Cosmic Rays production and acceleration. The most natural ... More
Presented by Dr. Giuseppe DI SCIASCIO on 6 Jul 2007 at 14:45
Type: Oral Session: OG 2.4
Track: OG.2.4
The Solar Tower Atmospheric Cherenkov Effect Experiment (STACEE) is an atmospheric Cherenkov telescope that uses a large mirror array to achieve a relatively low energy threshold. For sources with Crab-like spectra, at high elevations, the detector response peaks near 100 GeV. Gamma-ray burst (GRB) observations have been a high priority for the STACEE collaboration since the inception of the ... More
Presented by Alexander JARVIS on 9 Jul 2007 at 12:53
Type: Oral Session: OG 2.3, 2.4
Track: OG.2.4
The GLAST Large Area Telescope (LAT) is the next generation satellite experiment for high-energy gamma-ray astronomy. It is a pair conversion telescope built with a plastic anticoincidence shield, a segmented CsI electromagnetic calorimeter, and the largest silicon strip tracker ever built. It will cover the energy range from 20 MeV to more than 300 GeV, shedding light on many issues left open ... More
Presented by Frederic PIRON on 10 Jul 2007 at 09:18
Type: Oral Session: OG 2.2
Track: OG.2.2
In this work we study the individual contribution to diffuse $\gamma$-ray emission from the secondary products in hadronic interactions generated by cosmic rays (CRs), in addition to the contribution of neutral-pions via the decay into two gamma rays. For that purpose we employ the Monte Carlo particle collision code DPMJET3.04 to determine the multiplicity spectra of various secondary p ... More
Presented by Prof. Martin POHL on 6 Jul 2007 at 09:54
Type: Poster Session: Posters 2 + Coffee
Track: OG.2.2 Board #: 103 (5B)
The recent advances in TeV gamma-ray astronomy are largely due to the ability to distinguish between extensive air showers generated by gamma rays and hadronic cosmic rays. In this paper, we report on a method to distinguish electromagnetic air showers from hadronic air showers in Tibet air-shower observation. An extensive Monte Carlo simulation has been carried out and the secondary particle ... More
Presented by Mr. Ding CHEN on 6 Jul 2007 at 14:45
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 129 (7A)
We propose to provide a gamma-ray burst monitor (GBM) for the CALET mission to monitor gamma-ray bursts (GRBs) simultaneously with the CALET main detector. The major purpose is to derive a wide-band energy spectrum of GRB over an unprecedented 9 decades of energy (from a few keV to 10 TeV) in combination with the CALET tower detector. Hence it is desirable to have the CALET-GBM covering an ene ... More
Presented by Dr. Kazutaka YAMAOKA on 9 Jul 2007 at 14:45
Type: Oral Session: Plenaries 5
Track: Special
Ongoing deep surveys of galaxy luminosity functions, spectral energy distributions and backwards evolution models of star formation rates can be used to calculate the past history of intergalactic photon densities and, from them, the present and past optical depth of the universe to gamma-rays. Stecker, Malkan & Scully have recently done this calculation for pair-production in ... More
Presented by Dr. F. W. STECKER on 9 Jul 2007 at 17:55
Type: Poster Session: Posters 2 + Coffee
Track: OG.2.2 Board #: 139 (7B)
We calculate the production of gamma rays by cosmic ray interactions with the lunar surface. We show that the major contribution comes from neutral pions produced in proton interactions with the nuclei in the lunar surface while the electron bremsstrahlung is a minor component contributing mostly at low energies. Our calculations show a good agreement with the EGRET observations of the lunar a ... More
Presented by Dr. Igor MOSKALENKO on 6 Jul 2007 at 14:45
Type: Oral Session: OG 2.5
Track: OG.2.5
In this contribution we will show our predictions for the intensity and the angular distribution of the gamma-ray and neutrino emissions above the TeV as should be originated from the hadronic scattering of cosmic rays (CR) with the interstellar medium (ISM). We simulated the spatial distribution of primary nuclei by solving numerically the diffusion equation considering several models o ... More
Presented by Dr. Dario GRASSO on 10 Jul 2007 at 12:29
Type: Poster Session: Posters 2 + Coffee
Track: OG.2.4 Board #: 112 (6A)
Gamma-ray bursts (GRBs) are among the potential very-high-energy (VHE) gamma-ray sources. VHE emission from GRBs is predicted by most GRB models. Despite its generally fast-fading nature in many wavebands, the time evolution of any VHE radiation is still not clear. The highest energy radiation from GRBs ever detected firmly by any instrument was a 18 GeV photon coming from GRB 940217 detected ... More
Presented by Pak Hin TAM on 6 Jul 2007 at 14:45
Type: Poster Session: Posters 2 + Coffee
Track: OG.2.3 Board #: 147 (7B)
Recent observations have revealed the existence of an enormously energetic ~ 10^61 erg AGN outburst in the Hydra A cluster of galaxies. This outburst has produced cavities in the intra-cluster medium, apparently supported by pressure from cosmic rays. Here we argue that these particles are very likely protons and nuclei. For a plausible spatial distribution of the target gas, based on observ ... More
Presented by Wilfried DOMAINKO on 6 Jul 2007 at 14:45
Type: Poster Session: Posters 2 + Coffee
Track: OG.2.2 Board #: 086 (5A)
The millisecond pulsars in globular clusters can accelerate leptons at the shock waves originated in collisions of the pulsar winds and/or inside the pulsar magnetospheres. Leptons diffuse gradually through the globular cluster comptonizing stellar and microwave background radiation. We calculate the GeV-TeV $\gamma$-ray spectra for different models of injection of leptons and parameters of ... More
Presented by Dr. Wlodek BEDNAREK on 6 Jul 2007 at 14:45
Type: Poster Session: Posters 2 + Coffee
Track: OG.2.2 Board #: 087 (5A)
Open clusters are concentrations of dense matter and young stars. It is expected that non-thermal processes play important role in these objects due to the observations of non-thermal X-ray emission and directional coincidence with some uniEGRET sources. We calculate the gamma-ray spectra expected from the open cluster Ber 87 assuming that hadrons and leptons are accelerated inside this objec ... More
Presented by Dr. Wlodek BEDNAREK on 6 Jul 2007 at 14:45
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 097 (5B)
Charged Cosmic Rays are a huge background in any IACT measurement. Traditional data analysis methods involve variables that try to characterize the shape of the shower 2D pattern at the IACT focal plane. The Hillas parameters are, in this context, widely used. In this contribution an innovative method based on 3D variables, the angles and the distances (impact parameters) in space between ... More
Presented by Prof. Mario PIMENTA on 9 Jul 2007 at 14:45
Type: Poster Session: Posters 1 + Coffee
Track: SH.1.4 Board #: 182 (9B)
The high energy ionizing radiation environment in the solar system consists of three main sources: the radiation belts, galactic cosmic rays and solar energetic particles. Geant4 is a Monte Carlo radiation transport simulation toolkit, with applications in areas as high energy physics, nuclear physics, astrophysics or medical physics research. In this poster, Geant4 applications to model and s ... More
Presented by Dr. Bernardo TOMÉ on 4 Jul 2007 at 14:45
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 105 (5B)
Imaging Air Cherenkov Telescopes (IACTs) detect the Cherenkov light flashes of Extended Air Showers (EAS) triggered by VHE gamma-rays impinging on the Earth's atmosphere. Due to the overwhelming background from hadron induced EAS, the discrimination of the rare gamma-like events is rather difficult, in particular at energies below 100 GeV. The influence of the Geomagnetic Field (GF) on t ... More
Presented by Mr. S.C. COMMICHAU on 9 Jul 2007 at 14:45
Type: Poster Session: Posters 1 + Coffee
Track: HE.1.4.B Board #: 015 (1B)
The experimental technique of fluorescence light observation is used in current and planned air shower experiments that aim at understanding the origin of ultra-high energy cosmic rays. In the fluorescence technique, the geometry of the shower is reconstructed based on the correlation between viewing angle and arrival time of the signals detected by the telescope. The signals are compare ... More
Presented by Dr. Markus RISSE on 4 Jul 2007 at 14:45
Type: Poster Session: Posters 2 + Coffee
Track: HE.1.6 Board #: 067 (4A)
The most common way to simplify extensive Monte-Carlo simulations of air showers is the thinning approximation. We study its effect on the physical parameters reconstructed from simulated showers. To this end, we created a library of showers simulated without thinning with energies from $10^{17}$~eV to $10^{18}$~eV, different zenith angles and primaries. This library is publicly available. Var ... More
Presented by Mr. Grigory RUBTSOV on 6 Jul 2007 at 14:45
Type: Poster Session: Posters 1 + Coffee
Track: SH.2.1 Board #: 190 (10A)
It is generally believed that Forbush Decrease (FD) events happen simultaneously over the globe of the Earth. However, there have been reports on non-simultaneous FD events. We investigate the properties of non- simultaneous FD events in order to determine what solar wind conditions lead to global simultaneity of FD events. We examined the hourly data of the Oulu Neutron Monitor (NM) ... More
Presented by Dr. Su Yeon OH on 4 Jul 2007 at 14:45
Type: Poster Session: Posters 1 + Coffee
Track: SH.2.3 Board #: 184 (9B)
We present the results of a study of the annual frequency distribution of cosmic ray decreases (amplitude ≥ 3%) for five solar activity cycles (19 to 23), using Climax neutron monitor hourly counting rate data. We confirm the main result of our earlier study, on a similar topic, over a shorter time interval (cyles 20, 21, and 22) that there is a notable gap in the distribution, near the maxi ... More
Presented by Prof. Harjit AHLUWALIA on 4 Jul 2007 at 14:45
Type: Oral Session: SH 3.6, SH 3.3, SH 4.2, SH 3.1
Track: SH.3.3
We study the spatial gradients of galactic cosmic rays in the inner heliosphere using data from the Kiel Electron Telescope (KET) aboard Ulysses and the Cosmic Ray Isotope Spectrometer (CRIS) aboard the Advanced Composition Explorer (ACE) for the time period from 1997 to 2007. This covers the solar minimum in the A>0-solar magnetic epoch, the solar magnetic reversal to an A<0-magnetic epoch at ... More
Presented by Mr. R. MÜLLER-MELLIN on 7 Jul 2007 at 12:17
Type: Poster Session: Posters 2 + Coffee
Track: SH.1.8 Board #: 194 (10A)
On the basis of neutron monitor world network data the GLE event of December 13, 2006 is studied. Taking into account the initial differential spectrum of galactic cosmic rays, viewing cones of the detectors, integral multiplicity of secondary neutrons at various latitudes and observation levels the GLE spectrum is estimated. It is noted that at the Yakutsk station this event has also been reg ... More
Presented by Dr. Sergey STARODUBTSEV on 6 Jul 2007 at 14:45
Type: Poster Session: Posters 2 + Coffee
Track: SH.1.8 Board #: 181 (9B)
An update list of responses to relativistic solar particles and to particles accelerated in interplanetary space to high energies (Kudela et al, Proc. 23rd ICRC, Calgary, vol. 3, p.71-74, 1992) for the period 1966 until December 2006 as recorded by a high mountain neutron monitor with nominal vertical cut-off rigidity ~ 4 GV is presented. Selected events and the specifics of high mountain ... More
Presented by Prof. Karel KUDELA on 6 Jul 2007 at 14:45
Type: Oral Session: OG 1.1
Track: OG.1.1
The balloon-borne Cosmic Ray Energetics And Mass (CREAM) payload flew for a record-breaking 42 days during the 2004/05 Antarctic season. The instrument incorporates a tungsten/scintillating-fiber sampling calorimeter and graphite targets to measure energies of nuclei. A finely segmented Silicon Charge detector (SCD) located above the targets is used for charge measurements. The position of the ... More
Presented by Mr. Y. S. YOON on 4 Jul 2007 at 08:54
Type: Oral Session: OG 2.2
Track: OG.2.2
The Galactic Plane is accessible to H.E.S.S. at longitudes up to 80 degrees through very low elevation observations. The ability of H.E.S.S. to observe at elevations as low as 25 degrees corresponding to an energy threshold of few TeV has been already validated through observations of the blazar Mkn 421. We report on H.E.S.S. data on the Galactic Plane up to the 80° longitude range and w ... More
Presented by Dr. Arache DJANNATI-ATAÏ on 7 Jul 2007 at 11:18
Type: Poster Session: Posters 2 + Coffee
Track: OG.2.2 Board #: 110 (6A)
Scan-based observations of the Galactic plane and continuing re-observations of known very-high-energy (VHE) gamma-ray sources with the H.E.S.S. system of imaging atmospheric Cherenkov telescopes have revealed a wide variety of new VHE objects. While in many cases these objects can be associated with known sources in the X-ray, radio, or optical wavebands, a subset of them currently have no o ... More
Presented by Dr. Karl KOSACK on 6 Jul 2007 at 14:45
Type: Oral Session: OG 2.3
Track: OG.2.3
Clusters of galaxies, the largest gravitationally bound objects in the universe, are expected to contain a significant population of hadronic and leptonic cosmic rays. Potential sources for these particles are merger and accretion shocks, starburst driven galactic winds and radio galaxies. Furthermore, since galaxy clusters confine cosmic ray protons up to energies of at least 1 PeV for a tim ... More
Presented by Dr. Wilfried DOMAINKO on 9 Jul 2007 at 11:30
Type: Poster Session: Posters 2 + Coffee
Track: OG.2.2 Board #: 120 (6B)
The shell-type supernova remnant RX J0852.0-4622 was detected in 2004 and re-observed between December 2004 and May 2005 with the High Energy Stereoscopic System (H.E.S.S.), an array of four Imaging Cherenkov Telescopes located in Namibia and dedicated to the observations of gamma-rays above 100 GeV. The angular resolution of < 0.1° and the large field of view of H.E.S.S. (5° diameter) are w ... More
Presented by Mrs. Marianne LEMOINE-GOUMARD on 6 Jul 2007 at 14:45
Type: Oral Session: OG 2.2
Track: OG.2.2
The shell-type supernova remnant (SNR) RCW 86 - possibly associated with the historical supernova SN 185 - was observed during the past three years with the High Energy Stereoscopic System (H.E.S.S.), an array of four atmospheric-Cherenkov telescopes located in Namibia. The multi-wavelength properties of RCW 86, e.g. weak radio emission and North-East X-ray emission almost entirely consist ... More
Presented by Mr. Stefan HOPPE on 4 Jul 2007 at 12:29
Type: Poster Session: Posters 2 + Coffee
Track: OG.2.2 Board #: 146 (7B)
In view of the discovery of HESS J1023-575 (discussed in a separate presentation), we examine other very high energy (VHE) gamma-ray sources possibly associated with massive star clusters. Particle acceleration in massive star forming regions can proceed at the interface of two interacting winds or result from a collective process; multiple shock acceleration or MHD turbulence. The gamm ... More
Presented by Dr. Alexandre MARCOWITH, Dr. Nukri KOMIN on 6 Jul 2007 at 14:45
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 151 (8A)
The High Altitude Water Cerenkov detector HAWC will be a powefull instrument to survey the TeV sky. Mexico has proposed to locate this experiment in the Parque Nacional Pico de Orizaba, between Citlaltepetl and Tliltepetl, host of the Large Millimeter Telescope (LMT). The region has a sizeable technical infrastructure related to the LMT and we recently studied a 4100m location in terms of i ... More
Presented by Dr. Alberto CARRAMINANA on 9 Jul 2007 at 14:45
Type: Oral Session: Rapporteurs
Track: Rapporteurs
Presented by Prof. Masahiro TESHIMA on 11 Jul 2007 at 10:30
Type: Oral Session: Rapporteurs
Track: Rapporteurs
Presented by Prof. Tom GAISSER on 11 Jul 2007 at 14:30
Type: Oral Session: Rapporteurs
Track: Rapporteurs
Presented by Dr. Ralph ENGEL on 11 Jul 2007 at 17:30
Type: Poster Session: Posters 2 + Coffee
Track: HE.1.5 Board #: 002 (1A)
The southern part of the Pierre Auger Observatory is nearing completion in the province of Mendoza, Argentina. The instrument has been used to take air shower data at the highest energies since 2004. The energy threshold for high quality shower data is about 3 10**18 eV for the surface array of particle detectors (SD). The data of the Auger fluorescence telescopes (FD) enable precise ev ... More
on 6 Jul 2007 at 14:45
Type: Poster Session: Posters 2 + Coffee
Track: OG.2.2 Board #: 098 (5B)
The results from H.E.S.S. observations towards Westerlund 2 are presented. The detection of very-high-energy gamma-ray emission towards the young stellar cluster Westerlund 2 in the HII complex RCW49 by H.E.S.S. provides ample evidence that particle acceleration to extreme energies is associated with this region. A variety of possible emission scenarios will be reviewed, ranging from high-ener ... More
Presented by Mr. Martin RAUE on 6 Jul 2007 at 14:45
Type: Oral Session: HE 1.6
Track: HE.1.6
Since about one decade, air shower simulations based on the hadronic interaction models QGSJET and SIBYLL predict very similar results for the main observables. For instance, the mean depth of the shower maximum Xmax agrees within 5% between the different models and are in relative good agreement with the measurements. However the number of muons at ground differs substantially between th ... More
Presented by Dr. Tanguy PIEROG on 5 Jul 2007 at 10:42
Type: Oral Session: OG 2.2
Track: OG.2.2
We examine the impact of nonlinear diffusive shock acceleration on the TeV visibility of SNRs. A dense molecular cloud near a SNR provides a good target for pp-collisions leading to subsequent gamma ray emission through neutral pion decay. The intensity and the spectral shape of this radiation is thus determined by the spectrum of accelerated particles. This may become instrumental in distin ... More
Presented by Dr. Igor MOSKALENKO on 7 Jul 2007 at 10:30
Type: Poster Session: Posters 1 + Coffee
Track: OG.1.4 Board #: 109 (6A)
If taken into account, the transmission of the particle-scattering turbulence --in addition to just the particles-- through the shock front can change the effective compression ratio felt by the accelerating particles significantly from the compression of the underlying plasma. This can lead to significantly harder energy spectra than what are traditionally predicted assuming frozen-in turbule ... More
Presented by Dr. Joni TAMMI on 4 Jul 2007 at 14:45
Type: Poster Session: Posters 1 + Coffee
Track: SH.2.1 Board #: 187 (10A)
IceTop is an air shower array now under construction at the South Pole. It is the surface component of IceCube, an observatory primarily focused on cosmic neutrinos. When completed, IceTop will have approximately 500 square meters of collecting area in the form of 160 separate ice Cherenkov detectors. These detectors are sensitive to electrons, photons, muons and neutrons. With the high ... More
Presented by Dr. Takao KUWABARA on 4 Jul 2007 at 14:45
Type: Oral Session: SH 2.1
Track: SH.2.1
Short-period variations in the integral GCR fluence ( > 100 MeV) often observed in neutron monitor data have also been seen by the High Sensitivity Telescope (HIST) aboard the Polar spacecraft. Although HIST was designed to measure radiation-belt electrons, it makes clean measurements of the integral GCR fluence when Polar is outside the radiation belts. These measurements show GCR varia ... More
Presented by Tamitha MULLIGAN on 6 Jul 2007 at 09:42
Type: Poster Session: Posters 1 + Coffee
Track: HE.1.3.A Board #: 067 (4A)
Point-like excesses have been alternately claimed and refuted in the direction of Cygnus X-3, BL-Lacertae objects, and others. We conduct a search for point- like deviations from isotropy in the arrival direction of ultra-high energy cosmic rays in the monocular data set collected by the High-Resolution Fly's Eye. We find no evidence for point-like excesses and place a 90% c.l. upper l ... More
Presented by Ms. Malina KIRN on 4 Jul 2007 at 14:45
Type: Oral Session: HE 1.4.A
Track: HE.2.3
Data from the High Resolution Fly's Eye detector that measures cosmic rays with the fluorescence technique is used to set limits on the flux of tau neutrinos in the energy range from 10^17 to 10^21 eV. This energy range is particularly interesting as we expect a guaranteed flux of cosmogenic neutrinos from the GZK mechanism.
Presented by Prof. Kai MARTENS on 4 Jul 2007 at 09:06
Type: Oral Session: HE 1.4.A
Track: HE.1.4.A
We present results on the ultra-high energy cosmic ray spectrum as measued by the High Resolution Fly's Eye Experiment. The spectrum is analyzed in two different ways: monocular reconstruction and stereo reconstruction. The monocular spectrum has the highest statistics while the stereo spectrum has the best resolution.The monocular spectrum has a threshold of .1 EeV while the stereo spectrum' ... More
Presented by Prof. Pierre SOKOLSKY on 4 Jul 2007 at 08:42
Type: Oral Session: OG 1.5
Track: OG.1.5
The Track Imaging Cerenkov Experiment (TrICE) is an air Cerenkov telescope designed to use a high resolution method for measuring cosmic-ray composition at TeV-PeV energies. The method aims to separate the fast and compact direct Cerenkov signal produced by primary cosmic ray nuclei in the upper atmosphere from the light produced by the subsequent air shower cascade. Efficient discrimination ... More
Presented by Elizabeth HAYS on 6 Jul 2007 at 12:41
Type: Oral Session: OG 2.5
Track: OG.2.5
We calculate the yield and flavor content of high energy neutrinos produced in astrophysical sources with and without magnetic fields varying their interaction depth. We pay special attention to the multiple scattering of secondaries on background photons as well as the direct production of neutrinos in decays of charm mesons. If multiple scattering of nucleons becomes important, the ne ... More
Presented by Dr. Ricard TOMAS on 9 Jul 2007 at 13:05
Type: Oral Session: HE 2.1
Track: HE.2.1
Using data of the L3+Cosmics experiment, a preliminary measurement of the muon multiplicity distribution is presented. These are compared to Monte Carlo simulation results obtained with the CORSIKA/QGSJET code. Below the "knee" of the primary spectrum 20% more muons are observed than expected. Taking into account the uncertainty of the present primary spectrum measurements, no abnormal phen ... More
Presented by Prof. Yuqian MA on 5 Jul 2007 at 11:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.1 Board #: 041 (2B)
Perturbative QCD predicts that there should be a significant flux of muons with high transverse momentum (p_T) produced in primary interactions of high-energy cosmic-rays. These muons arise from the semileptonic decays of heavy quarks, and from the decays of high p_T kaons and pions produced in jets. These muons can be useful to study the cosmic-ray composition in a pQCD framework. ... More
Presented by Dr. Spencer KLEIN on 9 Jul 2007 at 14:45
Type: Poster Session: Posters 1 + Coffee
Track: OG.1.5 Board #: 127 (7A)
The handling of solid-state track detector (SSTD) has been historically required for a long period and many human powers to scan and analyze etch-pits produced on the detector. Because a large area greater than a few m^2 detector is required to observe ultraheavy nuclei in galactic cosmic rays, a high speed scanning system is practically important to realize our observation. We have developed ... More
Presented by Mr. Satoshi KODAIRA on 4 Jul 2007 at 14:45
Type: Oral Session: Plenaries 6
Track: Special
The Pierre Auger Observatory is now ~80% completed with all of the fluorescence detectors and 1300 tanks in operation. The exposure accumulated since January 2004 is ~ 5000 km^2 sr yr, approximately 3 times that reached by AGASA and about twice the exposure of HiRes. The hybrid nature of the detector and unparalleled attention to systematic uncertainties has allowed an accurate measurement o ... More
Presented by Dr. Alan A. WATSON on 10 Jul 2007 at 17:25
Type: Oral Session: HE 1.4.B
Track: HE.1.4.B
We study the propagation of cosmic rays at the highest energies of different compositions and discuss the implications for anisotropy studies of future UHECR observatories. The evolution of the horizon of cosmic rays as a function of the energy is mass dependent: low and intermediate mass nuclei can only originate from very nearby sources above a few 10^19 eV and the composition above 4.10^1 ... More
Presented by Prof. Angela OLINTO on 7 Jul 2007 at 11:18
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 153 (8A)
We have developed a hybrid photo-detector (HPD) for the Ashra detector. The HPD consists of a 6-inch electron tube and a multi-pixel silicon detector followed by trigger decision ASIC circuits. The advanced features of the silicon detector are as follows: 1. high resolution with 64 x 64 channels using bump bonding technique 2. high gain due to a thin dead layer and a large effective area ... More
Presented by Dr. Masataka MASUDA on 9 Jul 2007 at 14:45
Type: Oral Session: HE 1.4.A
Track: HE.1.4.A
A key feature of the Pierre Auger Observatory is its hybrid design, in which ultra high energy cosmic rays are detected simultaneously by fluorescence telescopes and a ground array. The two techniques see air showers in complementary ways, providing important crosschecks and measurement redundancy. Much of the hybrid capability stems from the accurate geometrical reconstruction it achieves, w ... More
Presented by Dr. Bruce DAWSON on 4 Jul 2007 at 10:30
Type: Poster Session: Posters 3 + Coffee
Track: SH.3.2 Board #: 158 (8B)
The long-term variation (modulation) of CR intensity is not exactly anti-parallel to sunspot activity. In odd cycles, there is a large hysteresis loop (difference in the evolution during the rising and falling phase of solar activity). In even cycles, the loop is narrow. So far, only data for two odd cycles (cycle 19 and 21) and two even cycles (20 and 22) were available and the above patt ... More
Presented by Dr. RAJARAM KANE on 9 Jul 2007 at 14:45
Type: Oral Session: SH 2.1
Track: SH.2.1
The Goddard Medium Energy experiment on the IMP 8 spacecraft has made nearly continuous observations of the near-Earth energetic particle environment from its launch in October, 1973 until near present. We summarize several aspects of these observations, including solar energetic particle events, CIR-associated events, and cosmic ray modulations. In particular, we note that, as expected from ... More
Presented by Tycho VON ROSENVINGE on 5 Jul 2007 at 12:53
Type: Poster Session: Posters 3 + Coffee
Track: SH.3.1 Board #: 173 (9A)
Peculiarities in distribution of the Jovian electrons along the Earth's orbit based on an extended set of observational data are investigated. It is shown that the maximum in the electron intensity appears 243 days after the Earth-Jupiter opposition. It corresponds to the IMF field time simultaneously covering the Jupiter and the Earth. Through the charged particle flux the Jupiter forms 3 ... More
Presented by Dr. Vladislav TIMOFEEV on 9 Jul 2007 at 14:45
Type: Oral Session: HE 3.5
Track: HE.3.5
The IceCube Neutrino Detector is a cubic kilometer ice-Cherenkov detector being constructed in the deep ice under the geographic South Pole. After a successful construction season ending in February 2007 IceCube consists of 22 strings and 26 IceTop stations with a total of 1424 Digital Optical Modules (DOMs) deployed at depths up to 2450m. This together with the commissioning of the central ... More
Presented by Albrecht KARLE on 5 Jul 2007 at 09:05
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.5 Board #: 124 (6B)
IceCube is a 1 km^3 neutrino observatory now being built at the South Pole. In addition to its larger size, IceCube is also designed to have smaller systematic errors than its AMANDA predecessor. IceCube performance for showering ('cascade'-like) events has been studied with LED and laser light sources. The detector resolution for cascade position, energy and direction has been studied ... More
Presented by Dr. Joanna KIRYLUK on 9 Jul 2007 at 14:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.1 Board #: 060 (3B)
The calibration of the surface air shower array of IceCube - IceTop is based on identifying and understanding the muon response of each IceTop tank. Special calibration runs are carried out throughout the year and are supplemented with austral season measurements with tagging telescope for vertical muons. The vertical equivalent muon (VEM) charge value of each tank is determined and monitored ... More
Presented by Dr. Levent DEMIROERS on 9 Jul 2007 at 14:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.1 Board #: 014 (1B)
Small air showers that trigger single or several IceTop stations usually have one or several muons with energy high enough to reach the IceCube in-ice detector. In this work, we first use the coincident events to calibrate the timing resolution between and within the two detectors. Using muons tagged by IceTop single station triggers, which usually contain a single high energy muon, we also cr ... More
Presented by Dr. Thomas GAISSER on 9 Jul 2007 at 14:45
Type: Poster Session: Posters 1 + Coffee
Track: HE.1.4.B Board #: 074 (4B)
The chemical composition of Ultra-High-Energy (UHE) comic rays is one of unsolved mysteries, and its study will give us fruitful information on the origin and acceleration mechanism of UHE cosmic rays. Especially, a detection of UHE gamma-rays by hybrid experiments, such as AUGER and TA, will be a key to solve these questions. The characteristics of UHE gamma-ray showers have been studied on l ... More
Presented by Mr. Yoshimitsu WADA on 4 Jul 2007 at 14:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.4 Board #: 064 (4A)
The Antarctic Impulsive Transient Antenna (ANITA) experiment may be the first experiment to identify astrophysical neutrinos of energy greater than 10^18 eV through the detection of radio Cherenkov pulses emitted by neutrino-induced particle showers in the Antarctic ice. A Monte Carlo simulation has been developed to determine the sensitivity and improve the event reconstruction capabilities o ... More
Presented by Brian MERCURIO on 9 Jul 2007 at 14:45
Type: Poster Session: Posters 2 + Coffee
Track: SH.1.8 Board #: 197 (10B)
This work is directed toward the experimental and theoretical investigation of the ground level solar cosmic ray enhancements (GLE). Relativistic protons (>1 GeV) are generated in powerful flares more often than they are observed at the Earth. Especially it concerns to observation at the middle latitudes. Although recorded magnitudes of ground level enhancements are usually very small at ... More
Presented by Dr. Olga KRYAKUNOVA on 6 Jul 2007 at 14:45
Type: Oral Session: OG 2.7
Track: OG.2.7
A instrument to image medium energy gamma-rays is being designed for the future NASA Advanced Compton Telescope (ACT) mission. This instrument consists of a gas microwell imaging detector with an active detection volume of approximately 1.6 m x 1.6m x 0.5m which is surrounded by a segmented calorimeter. The use of the gas imager allows for the detection and tracking of the recoil elect ... More
Presented by Dr. Jason LINK on 9 Jul 2007 at 09:06
Type: Oral Session: SH 3.4, SH 3.5
Track: SH.3.4
This paper presents the sidereal anisotropy of ~10 TeV galactic cosmic ray (GCR) intensity observed by the Tibet Air Shower experiment. The observed sky- map of the directional anisotropy clearly shows the large-scale feature consisting of excess and deficit of the relative intensity. We note that the observed angular separation between the excess and the deficit is ~120 deg, which is muc ... More
Presented by Prof. M. TAKITA on 10 Jul 2007 at 08:30
Type: Poster Session: Posters 1 + Coffee
Track: OG.1.5 Board #: 119 (6B)
The CREAM (Cosmic Ray Energetics And Mass) data acquisition (CDAQ) system showed excellent stability and robustness during the 2004/05 and 2005/06 Antarctic campaigns. The CREAM-III Calorimeter, scheduled to be launched in December 2007, was calibrated at a CERN test beam in October 2006. During the beam test, the CDAQ software, running on a non-flight Beam Test Computer (BTC) system, c ... More
Presented by Prof. Eun-Suk SEO on 4 Jul 2007 at 14:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.4 Board #: 050 (3A)
In neutrino astronomy, glacial ice or deep ocean water are used as detector media. Typically, neutrinos are recognized by distinguishing charged particles generated in neutrino interactions from atmospheric muons, using in situ detectors recording time distributions and fluxes of faint photon fields of Cherenkov radiation. The IceCube collaboration has developed an empirical model descri ... More
Presented by Mr. Johan LUNDBERG on 9 Jul 2007 at 14:45
Type: Oral Session: Plenaries 4
Track: Special
Presented by Blanca GARCIA-GUTIÉRREZ, Martha ORTEGA-SOTO, Federico LAZARÍN-MIRANDA on 7 Jul 2007 at 17:55
Type: Oral Session: HE 1.5
Track: HE.1.5
Radio receivers (RICE, AURA) have been deployed to detect impulsive emissions from neutrino interactions in ice at South Pole. An alternative source of pulses is the cores of cosmic ray induced air showers. AIRES and CORSIKA simulations suggest that >10% of the primary cosmic ray energy enters the ice within 20 cm of the primary axis impact point. The resulting 5-10 m cascade will make Askarya ... More
Presented by Dr. David SECKEL on 10 Jul 2007 at 10:54
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 143 (7B)
The Large Area Telescope (LAT) is one of the two instruments onboard the Gamma-ray Large Area Space Telescope (GLAST), the next generation high-energy gamma-ray telescope, to be launched in Fall of 2007. It is comprised of sixteen identical towers in a four by four grid, each tower containing a silicon tracker and a CsI calorimeter that together will give the incident direction of the pair-con ... More
Presented by Mrs. Claudia LAVALLEY on 9 Jul 2007 at 14:45
Type: Poster Session: Posters 1 + Coffee
Track: OG.1.1 Board #: 149 (8A)
PAMELA is a satellite-borne experiment designed to study the charged component of the cosmic radiation of galactic, solar and trapped nature. The main scientific objective is the study of the antimatter component of cosmic rays over a wide range of energies. PAMELA is mounted on the Resurs DK1 satellite that was launched on June 15th 2006 from the Baikonur cosmodrome and is now on a semipolar ... More
Presented by Dr. Silvio ORSI on 4 Jul 2007 at 14:45
Type: Poster Session: Posters 1 + Coffee
Track: OG.1.5 Board #: 134 (7A)
PAMELA cosmic-ray detector is orbiting around the Earth on board the Resurs DK1 satellite since June 2006. The experiment is designed to study charged particles in the cosmic radiation, being optimized in particular for antiprotons and positrons. The core of the telescope is a magnetic spectrometer equipped with several detectors. Six planes of silicon microstrip sensors are placed inside the ... More
Presented by Massimo BONGI on 4 Jul 2007 at 14:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.3.3 Board #: 021 (1B)
Under the assumption the Neutralino as lightest supersymmetric particle being the DM particle, studies of the evolution of Super Massive Black Holes expected in the center of most galaxies predict the existance of some 100-1000 Intermediate Mass Black Holes (IMBH) also in our galaxy [Bertone et al. 2005]. Since IMBHs did not suffer major merging and barionic accretion, they can have a very ... More
Presented by Dr. Michele DORO on 9 Jul 2007 at 14:45
Type: Oral Session: HE 3.3
Track: HE.3.3
Within the Cold Dark Matter scenario of structure formation, assuming the dark matter is composed by common candidates such as supersymmetric particles, the smallest bound structures have masses as low as 10^-6. High-resolution N-body experiments have shown that a large fraction of these small structures survive hierarchical clustering and can be found within the halo of our own Galaxy. These ... More
Presented by Dr. Lidia PIERI on 10 Jul 2007 at 09:42
Type: Oral Session: HE 1.4.B
Track: HE.1.4.B
Relativistic outflows carrying large scale magnetic fields have large inductive potential and may accelerate protons to ultra high energies. We discuss a novel scheme of Ultra-High Energy Cosmic Ray acceleration due to drifts in magnetized, cylindrically collimated, sheared jets of powerful active galaxies. We point out that a positively charged particle carried by such a flow is in ... More
Presented by Mr. Maxim LYUTIKOV on 7 Jul 2007 at 08:42
Type: Oral Session: HE 3.1
Track: HE.3.1
The GRAPES-3 experiment observes extensive air showers using a high-density array of scintillation detectors and a large area tracking muon detector. We have studied the relationship between the muon multiplicity distribution and shower size for the GRAPES-3 data taken during the period of 2000 - 2003. Monte Carlo simulations using CORSIKA code were performed to extract the spectra for vario ... More
Presented by Dr. Hideki TANAKA on 9 Jul 2007 at 13:17
Type: Poster Session: Posters 1 + Coffee
Track: HE.1.4.A Board #: 046 (3A)
The paper concerns the images in the fluorescence light of EAS of ultra-high energies. The effect of the multiple scattering of the light in the atmosphere on the way from the shower to the observer is investigated. We show what are the relevant parameters of the geometry for describing this effect. We also show that when analysing the scattered light not delayed too much (with respect to the ... More
Presented by Prof. Maria GILLER on 4 Jul 2007 at 14:45
Type: Oral Session: HE 1.3.A
Track: HE.1.4.A
The EAS induced by ultra high energy cosmic rays excite the atmosphere which emits fluorescence light. Images of showers in this light can be registered from large distances,as narrow tracks, the intensity at a given level being proportional to the shower energy deposited there. However, there is also Cherenkov light accompanying the shower which, when scattered sideways, adds to the fluoresc ... More
Presented by Prof. Maria GILLER on 6 Jul 2007 at 11:22
Type: Oral Session: HE 1.5
Track: HE.1.5
JEM-EUSO with a large and wide-angle telescope mounted on ISS has been planed as a space mission to explore extremes of the universe through the investigation of ultra-high-energy cosmic rays by detecting photons which accompany air showers developed in the earth's atmosphere. JEM-EUSO will be launched by Japanese H-II Transfer Vehicle(HTV) and mounted at the Exposed Facility of Japanes ... More
Presented by Prof. Fumiyoshi KAJINO on 10 Jul 2007 at 09:30
Type: Poster Session: Posters 1 + Coffee
Track: OG.1.5 Board #: 153 (8A)
We present results from the operation of the high mountain array of 4 water Cherenkov detectors located at 4550 m. a.s.l. located at Sierra Negra mountain (N 18 59.1, W 97 18.76 ) near of Puebla city in Mexico. The detectors consist of 4 light-tight cylindrical containers of 4 m2 cross section separated 25m. The vertices of the array form a triangle with one detector in the middle. The detect ... More
Presented by Dr. Humberto SALAZAR on 4 Jul 2007 at 14:45
Type: Poster Session: Posters 2 + Coffee
Track: SH.1.8 Board #: 193 (10A)
A population of dust grains produced by asteroids and comets is continually orbiting the Sun to within several Rsun. The grains scatter sunlight and make up the solar F corona, which shows only slow variations with time. Grain dynamics are due primarily to interactions with solar photons and the solar wind, but they are also bombarded by the E > 1 MeV energetic particles propagating an ... More
Presented by Stephen KAHLER on 6 Jul 2007 at 14:45
Type: Poster Session: Posters 3 + Coffee
Track: SH.3.4 Board #: 199 (10B)
Data on the hourly means of cosmic ray density and anisotropy derived by the GSM method over the 1957-2006 are introduced in to MySQL database. This format allowed an access to data both in local and in the Internet. Using the realized combination of script-language Php and My SQL database the Internet project was created on the access for users data on the CR anisotropy in different for ... More
Presented by Dr. Viktor YANKE, Mr. Aliaksandr ASIPENKA on 9 Jul 2007 at 14:45
Type: Poster Session: Posters 2 + Coffee
Track: SH.3.6 Board #: 189 (10A)
The Forbush decreases, recorded during 1951-2005 neutron measurements on Climax Cosmic Ray Station were used, estimating their number per year F(n) and calculating their total yearly decrease F(t). They were investigated together with certain parameters of the hurricanes recorded over a large Atlantic Ocean area, situated between 25 and 60 degrees West, and 8 and 23 degrees North. In that are ... More
Presented by Prof. Stilian KAVLAKOV on 6 Jul 2007 at 14:45
Type: Oral Session: HE 2.1
Track: HE.2.1
MINOS is the first large magnetic detector deep underground and is the first to measure the muon charge ratio with high statistics in the region near 1 TeV. An approximate formula for the muon charge ratio can be expressed in terms of epsilon_pi = 115 Gev, epsilon_K = 850 GeV and E_mu times cosine theta-zenith. The implications for K production in the atmosphere will be discussed.
Presented by Dr. Maury GOODMAN on 5 Jul 2007 at 08:42
Type: Poster Session: Posters 2 + Coffee
Track: OG.2.1 Board #: 132 (7A)
Inverse Compton scattering by relativistic electrons produces a major component of the diffuse emission from the Galaxy. The photon fields involved are the cosmic microwave background and the interstellar radiation field from stars and dust. Calculations of the inverse Compton distribution have usually assumed a smooth ISRF, but in fact a large part of the Galactic luminosity comes from the mo ... More
Presented by Mrs. Elena ORLANDO on 6 Jul 2007 at 14:45
Type: Oral Session: SH 2.1
Track: SH.2.1
Muon rate variations during Forbush decreases registered by means of muon detectors DECOR, TEMP and URAGAN operated in the experimental complex NEVOD (MEPhI, Moscow) have been studied. Analysis of data of these setups and also of Moscow neutron monitor (IZMIRAN) has been performed using a special technique that reduces as statistical as systematic uncertainties. Preliminary muon energy a ... More
Presented by Dr. Dmitry TIMASHKOV on 5 Jul 2007 at 12:29
Type: Poster Session: Posters 1 + Coffee
Track: HE.1.1.A Board #: 020 (1B)
EAS events are developing in the last few 10 kilometers of their path. But geomagnetic field has been extended until a few thousand kilometers from the ground. This field deflects charged particles. The deflection is different for different directions and observers. These differences is due to amount and direction of the geomagnetic field (a dipole at the centre of the earth) and the directio ... More
Presented by Dr. Mehdi KHAKIAN on 4 Jul 2007 at 14:45
Type: Poster Session: Posters 1 + Coffee
Track: HE.1.1.A Board #: 021 (1B)
Actually until the shower maximum the effect of the atmosphere is: 'an environment for extension of EAS events', but after it the 'absobtion effect of the atmosphere' will be dominant. Since the shower maximum for ~100 TeV is ~550 gr/cm^2(~5000m a.s.l), and we are always after it (1200m a.s.l) specially for higher zenith angle events. So actually in the energy and the site we have to con ... More
Presented by Dr. Mehdi KHAKIAN on 4 Jul 2007 at 14:45
Type: Oral Session: HE 2.4
Track: HE.2.4
A possible signature of a neutrino-induced air shower is a near-horizontal event developing very deeply in the atmosphere at depths exceeding a few thousand g/cm^2. Making use of high-statistics shower libraries we study the background to such events from: (1) high-energy muons produced in primary proton events, which may propagate deeply into the atmosphere before initiating a subcascade; ... More
Presented by Prof. Karl-Heinz KAMPERT on 10 Jul 2007 at 12:29
Type: Poster Session: Posters 3 + Coffee
Track: SH.4.1 Board #: 169 (9A)
Ion acceleration and Alfven waves excitation at the interplanetary shocks is studied within the quasilinear approach. Numerically calculated spectra of ions and Alfven waves are compared with experimental data. It is shown that calculations are well consistent with the existing measurements.
Presented by Prof. Evgeny BEREZHKO on 9 Jul 2007 at 14:45
Type: Oral Session: SH 1.2, SH 1.3
Track: SH.1.3
In association with an X17.0 flare on 2005 September 7, strong neutral emissions were detected both in space and on the ground. In space, intense emissions of gamma-rays were registered by INTEGRAL and by RHESSI during the decay phase. Gamma-ray lines at 0.511, 2.2, 4.4, and 6.1 MeV were observed and there was evidence for pion-decay radiation. On the ground, relativistic neutrons were o ... More
Presented by Dr. Kyoko WATANABE on 4 Jul 2007 at 09:18
Type: Oral Session: SH 1.3, SH 1.4
Track: SH.1.4
Measurements with advanced instrumentation on the SAMPEX, SOHO and ACE spacecraft show a large variability of the ionic charge of heavy ions in solar energetic particle (SEP) events with energy, in particular for Fe. In this paper we present a survey of ionic charge observations in interplanetary shock related SEP events obtained in the energy range ~0.18-0.43 MeV/nuc with the SEPICA instrum ... More
Presented by Dr. B. KLECKER on 4 Jul 2007 at 11:30
Type: Poster Session: Posters 2 + Coffee
Track: OG.2.2 Board #: 149 (8A)
The H.E.S.S. collaboration found several so far unidentified sources of TeV-gamma-radiation without any known counterpart in other wavelengths. One of those is HESS J1303-631 which was serendipitiously found in the same field of view of PSR B1259-63 / SS 2883. The possibility that HESS J1303-631 is a clump of dark matter is discussed.
Presented by Joachim RIPKEN on 6 Jul 2007 at 14:45
Type: Oral Session: OG 1.1, OG 1.2
Track: OG.1.2
We use the GALPROP code and the ACE data to derive the cosmic ray isotopic composition at the sources. The composition is derived for two propagation models, diffusive reacceleration and plain diffusion. We show that the compositions derived assuming different propagation models are different. We also compare the isotopic composition at the sources with the latest solar composition. This may p ... More
Presented by Dr. Igor MOSKALENKO on 5 Jul 2007 at 09:06
Type: Oral Session: OG 2.7
Track: OG.2.7
The detection of cosmic gamma quanta is very important towards to build an appropriate picture of the Universe. One of the most convenient techniques is the atmospheric Cherenkov technique i.e. the detection of the Cherenkov light in extensive air shower. The Cherenkov telescope Kartalska field for ground based gamma astronomy is presented. The Cherenkov telescope represents set of spherical m ... More
Presented by Dr. alexander MISHEV on 9 Jul 2007 at 11:30
Type: Oral Session: HE 2.2
Track: HE.2.2
Muon neutrino disappearance probability as a function of neutrino flight lenght L over neutrino energy E was studied. A dip in the L/E distribution was bserved in the data from Super-Kamiokande-I+II, as perdicted from the sinusoidal flavor transition probability of neutrino oscillation. The observed L/E distribution onstrained nu_mu <-> nu_tau neutrino oscillation parameters. We also prese ... More
Presented by Dr. Itaru HIGUCHI on 7 Jul 2007 at 12:17
Type: Oral Session: HE 1.2.A
Track: HE.1.2.A
LOPES30 is a digital radio antenna array working in the frequency range 40 -- 80 MHz with 30 dipole antennas triggered by the air shower experiment KASCADE-Grande. From an absolute calibration the measured field strength of the LOPES30 antenna system is known and the invesitigation of a large data set taken in east-west polarisation is performed. The reconstructed pulse height of the radio em ... More
Presented by Mr. Steffen NEHLS on 6 Jul 2007 at 09:30
Type: Poster Session: Posters 1 + Coffee
Track: OG.1.1 Board #: 123 (6B)
Our galaxy is filled with relativistic nuclei and electrons, or galactic cosmic rays(GCRs). The source of GCR nuclei, especially ultraheavy nuclei(Z>30), is still unknown, though the measurement of ultraheavy cosmic rays has been identified as an important goal of cosmic-ray research. Observation program of ultra-heavy nuclei in GCRs is proposed with the use of solid-state track detector on bo ... More
Presented by Prof. Nobuyuki HASEBE on 4 Jul 2007 at 14:45
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 126 (6B)
As a calibrated laser pulse propagates through the atmosphere, the Rayleigh scattered light intensity arriving at the VERITAS telescopes can be calculated precisely when atmospheric conditions are good. This technique is originally developed for the absolute calibration of ultra high energy cosmic ray fluorescence telescopes but is also applicable to imaging atmospheric Cherenkov telescopes. ... More
Presented by Ms. Michelle HUI on 9 Jul 2007 at 14:45
Type: Poster Session: Posters 2 + Coffee
Track: HE.1.5 Board #: 018 (1B)
The relative fluorescence efficiency for MeV electrons in nitrogen and air has been measured with high precision by the AIRLIGHT experiment. The range from 300nm to 400nm was spanned using a 300nm to 400nm broad-band (M- UG6) filter and 5 narrow-band filters. Fluorescence photons were detected by seven 2” PMTs in coincidence with the signals of a plastic scintillator which stopped the c ... More
Presented by Dr. Danays GONZALEZ on 6 Jul 2007 at 14:45
Type: Poster Session: Posters 1 + Coffee
Track: HE.1.4.B Board #: 050 (3A)
The energy is among the characteristics of Ultra High Energy Cosmic Rays (E>5 x 1019 eV) which could be estimated experimentally. The following paper attempts to estimate the energy of an UHECR proton by applying a Monte Carlo simulation code. A number of extensive air showers, vertical and inclined, is simulated to derive the Lateral Distribution Functions of the shower muons. The scenar ... More
Presented by Dr. Olga MALANDRAKI on 4 Jul 2007 at 14:45
Type: Oral Session: HE 1.1.A
Track: HE.1.1.A
With the present size of the IceTop air shower array it is possible to measure an energy spectrum in the range of 1 PeV to 100 PeV. To do so, a lateral pulse height fit was performed on all analysed showers. Therefore it is crucial to have a realistic parametrisation of the expected lateral distribution and the corresponding fluctuations of the measured tank signals. Since IceTop tanks do not ... More
Presented by Mr. Stefan KLEPSER on 9 Jul 2007 at 10:54
Type: Poster Session: Posters 1 + Coffee
Track: HE.1.3.A Board #: 069 (4A)
The normalization constant of the lateral distribution function (LDF) of an extensive air shower is a monotonous (almost linear) increasing function of the energy of the primary, as well as a monotonous decreasing function of the distance from the shower core. Therefore, the interpolated signal at some fixed distance from the core can be calibrated to estimate the energy of the shower. There i ... More
Presented by Mr. Germán ROS on 4 Jul 2007 at 14:45
Type: Oral Session: HE 1.6
Track: HE.1.6
Interpretation of EAS measurements strongly depends on detailed air shower simulations. The uncertainty in the prediction of shower observables for different primary particles and energies is currently dominated by differences between hadronic interaction models.The new models QGSJET-II and EPOS, which reproduce all major results of existing accelerator data (including detailed data of RHIC ex ... More
Presented by Dr. Tanguy PIEROG on 5 Jul 2007 at 11:18
Type: Poster Session: Posters 1 + Coffee
Track: SH.2.2 Board #: 178 (9A)
Richardson et al. [1996] statistically investigated CIR-driven modulations of Galactic Cosmic Ray (GCR) density with the data obtained by satellites. By examining depressions caused by CIRs with and without the Sector Boundary (SBs), they concluded that SBs do not organize the GCR density. On the other hand, a 22-year cycle in the amplitude of depressions was also confirmed. They suggested tha ... More
Presented by Mr. Yoshitaka OKAZAKI on 4 Jul 2007 at 14:45
Type: Oral Session: OG 1.5
Track: OG.1.5
The PAMELA (Payload for Antimatter Matter Exploration and Light nuclei Astrophysics) experiment is a satellite-borne apparatus mounted on the Resurs DK1 russian satellite, launched from the Baikonur cosmodrome on June 15th 2006. It is designed to study charged particles in the cosmic radiation with a particular focus on antiparticles and light nuclei. The PAMELA apparatus comprises a time-o ... More
Presented by Dr. Giuseppe OSTERIA on 6 Jul 2007 at 11:30
Type: Poster Session: Posters 2 + Coffee
Track: OG.2.3 Board #: 168 (8B)
We have established cumulative flux limits in the COMPTEL energy range (0.75-30 MeV) for a large sample of active galactic nuclei (AGN) of general interest. Our target list consists of both known and unidentified gamma-ray sources at high Galactic latitudes. Limits to the time-averaged MeV-emission measured with COMPTEL are derived from all-sky maximum-likelihood and flux maps produced using t ... More
Presented by Dr. J. Gregory STACY on 6 Jul 2007 at 14:45
Type: Oral Session: HE 2.3
Track: HE.2.3
The Pierre Auger Observatory has the capability of detecting ultra-high energy neutrinos by searching for very inclined showers with a significant electromagnetic component. In this work we discuss the discrimination power of the instrument for ultra-high energy neutrinos. Based on the data collected since January 2004 an upper limit to the diffuse flux of neutrinos at EeV energies is presen ... More
Presented by Dr. Oscar BLANCH-BIGAS on 5 Jul 2007 at 12:13
Type: Oral Session: HE 1.5
Track: HE.1.5
on 10 Jul 2007 at 08:30
Type: Oral Session: OG 2.1, OG 2.2
Track: OG.2.2
The detection of TeV gamma-rays from the direction of the Galactic Centre is one of the most exciting discoveries in recent years. Observations by the H.E.S.S. system of imaging atmospheric Cherenkov telescopes provide the most precise available data on this source in the energy range 150 GeV - 30 TeV. The vicinity of the kinetic centre of our galaxy harbours numerous objects which could poten ... More
Presented by Christopher VAN ELDIK on 4 Jul 2007 at 08:54
Type: Poster Session: Posters 2 + Coffee
Track: OG.2.3 Board #: 134 (7A)
Active Galaxies such as Mrk 421 have been shown to be highly variable at all time scales. Atmospheric Cherenkov Telescopes (ACTs) have excellent instantaneous sensitivity and have observed short bright flares from Mrk 421. However, long duration variability is difficult to monitor with ACTs due to their intermittent exposure. Milagro, in contrast, monitors Mrk 421 with daily observations. Whi ... More
Presented by Dr. Andrew SMITH on 6 Jul 2007 at 14:45
Type: Poster Session: Posters 2 + Coffee
Track: OG.2.3 Board #: 153 (8A)
The MAGIC telescope has performed long term monitoring observations of the bright TeV Blazars Mrk421, Mrk501 and 1ES1959+650. Up to 40 observations, 30 minutes each have been performed for each source evenly distributed over the observable period of the year. The sensitivity of MAGIC is sufficient to establish a flux level of 25% of the Crab flux for each measurement. These observations are w ... More
Presented by Dr. Florian GOEBEL on 6 Jul 2007 at 14:45
Type: Oral Session: OG 2.3
Track: OG.2.3
The high-frequency peaked BL Lac PKS 2155-304, the lighthouse of the Southern hemisphere sky at VHE gamma-ray energies, has been followed by the H.E.S.S. array of atmospheric Cherenkov telescopes since the first light of the project, first with a single telescope in 2002, then with two & three telescopes in 2003, and since 2004 with the full-sensitivity four-telescope array. In this mode, a n ... More
Presented by Dr. Michael PUNCH on 9 Jul 2007 at 10:42
Type: Oral Session: SH 3.2
Track: SH.3.2
The residual modulation refers to the invariant level of modulation (modulation potential approximately 450 MV) observed at sunspot minimum since the commencement of the neutron monitor record in 1951. Satellite measurements of the heliomagnetic field show that it exhibited a similar invariance (~5.2 nT) between the sunspot minima of 1965 and 1996. The cosmic ray record since 1428 shows ... More
Presented by Dr. Ken MCCRACKEN on 9 Jul 2007 at 12:29
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 136 (7A)
High-peaked BL Lacertae objects are the prime source population for studies with Cherenkov telescopes. It is obvious that monitoring observations of strong blazars are orthogonal to the mission of the larger Cherenkov telescopes, as H.E.S.S. and MAGIC with their discovery potential for new sources (luminosity function, redshift distribution). We propose to set up a Cherenkov telescope with lo ... More
Presented by Markus MEYER on 9 Jul 2007 at 14:45
Type: Oral Session: SH 3.6
Track: SH.3.6
Cosmogenic radionuclides can be considered as surrogates for a neutron monitor because they are produced mainly by the interaction of cosmic ray neutrons with nitrogen and oxygen in the atmosphere. Measured in natural archives such as ice cores (10Be) and tree rings (14C) they record the cosmic ray intensity. Compared to manmade neutron monitors their time resolution is low (years) and their ... More
Presented by Prof. Juerg BEER on 7 Jul 2007 at 11:42
Type: Poster Session: Posters 2 + Coffee
Track: HE.1.5 Board #: 017 (1B)
After a 1-year-long running time, much information has been collected on the performance of the ARGO-YBJ detector. In particular, increased expertise on the detector behaviour in the peculiar environmental conditions of the experimental site (4300 meters a.s.l.) has been reached. Here we show and discuss the correlation between the detector operating parameters and the environmental fact ... More
Presented by Dr. Paolo CAMARRI on 6 Jul 2007 at 14:45
Type: Oral Session: HE 1.3.A
Track: HE.1.3.A
Traditionally, longitudinal shower profiles are reconstructed in fluorescence light experiments by treating the Cherenkov light contribution as background. In this talk we will argue that, due to the universality of the energy spectra of electrons and positrons, both fluorescence and Cherenkov light can be used simultaneously as signal to infer the longitudinal shower development. We pres ... More
Presented by Dr. Michael UNGER on 7 Jul 2007 at 08:54
Type: Poster Session: Posters 2 + Coffee
Track: OG.2.4 Board #: 096 (5B)
The LAGO project aims at the detection of high energy photons from GRBs using the single particle technique in ground based water Cherenkov detectors. To reach a reasonable sensitivity, high altitude mountain sites have been selected and detectors are in operation in Mexico (Sierra Negra, 4650m a.s.l.) and Bolivia (Chacaltaya, 5300m a.s.l.). We report on detector calibration and operation at h ... More
Presented by Xavier BERTOU on 6 Jul 2007 at 14:45
Type: Oral Session: HE 2.2
Track: HE.2.2
Super-Kamiokande-I studied low energy neutrino interactions above 4.5 MeV. Photo-cathode coverage has been restored to 40% in Super-Kamiokande-III in order to observe Cherenkov events with an energy even below 4.5 MeV. This is motivated by the transition of solar neutrino oscillations between vacuum and matter-dominated oscillations near 3 MeV and delayed neutron detection from inverse-beta in ... More
Presented by Dr. Michael SMY on 7 Jul 2007 at 13:05
Type: Poster Session: Posters 2 + Coffee
Track: OG.2.4 Board #: 128 (7A)
During its first observation cycle, between April 2005 and March 2006, the MAGIC telescope was able to observe nine different GRB events since their early beginning. Other observations have been performed during the following months in its second observation cycle. The observations, with an energy threshold spanning from 80 to 200 GeV, did not reveal any gamma-ray emission. The computed up ... More
Presented by Dr. Markus GARCZARCZYK on 6 Jul 2007 at 14:45
Type: Poster Session: Posters 2 + Coffee
Track: OG.2.3 Board #: 093 (5A)
A nonlinear kinetic theory of cosmic-ray acceleration in supernova remnants is employed to investigate the properties of the remnant SN 1987A. It is shown that a large downstream magnetic field 10 mG is required to fit the existing observational data. Such a strong field, together with the strong shock modification due to CR back- reaction, provides the steep and concave radio-emission spectr ... More
Presented by Dr. Leonid KSENOFONTOV on 6 Jul 2007 at 14:45
Type: Oral Session: SH 2.1
Track: SH.2.1
We propose a non stationary three dimensional (3-D) model based on the transport equation to describe the temporal changes of the rigidity spectrum of the sporadic Forbush effect of galactic cosmic ray intensity observed by neutron monitors and ground meson telescopes (energy range of 5-50 GeV). We show that the main reason of the temporal changes of the rigidity spectrum of the galactic ... More
Presented by Prof. Michael ALANIA on 6 Jul 2007 at 08:54
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 130 (7A)
Detailed Monte Carlo simulations of possible configurations for a future large-scale installation of Imaging Atmospheric Cherenkov Telescopes, the CTA (Cherenkov Telescope Array), have been carried out. This includes a full treatment of shower fluctuations, night sky background, registration of the signal and reconstruction of the registered showers. Although not representing a detailed desig ... More
Presented by Dr. Thomas SCHWEIZER on 9 Jul 2007 at 14:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.2 Board #: 079 (4B)
The Main Injector Neutrino Oscillation Search (MINOS) experiment has continued to collect atmospheric neutrino events while doing a precision measurement of NuMI beam nu_mu disappearance oscillations. The 5.4 kton iron calorimeter is magnetized to provide the unique capability of discriminating between nu_mu and nu_mu_bar interactions on an event-by-event basis and has been collecting atmosp ... More
Presented by Prof. Alec HABIG on 9 Jul 2007 at 14:45
Type: Poster Session: Posters 1 + Coffee
Track: SH.1.7 Board #: 202 (10B)
Magnetic clouds, as subsets of Interplanetary Coronal Mass Ejections, are modulating the interplanetary space. We present six observed magnetic clouds and simulate them according to the circular and the new elliptic cylindrical models. Both models correspond to magnetic clouds attached to the sun and the simulations estimate the characteristics of the clouds, such probable shapes, orientat ... More
Presented by Dr. Olga MALANDRAKI on 4 Jul 2007 at 14:45
Type: Oral Session: OG 1.2, OG 1.3
Track: OG.1.3
We report on a project to constrain the large-scale and turbulent magnetic fields of the Milky Way galaxy, which eventually will incorporate all of the relevant observational data. The initial work is based primarily on the WMAP3 polarization and intensity maps, plus a large number of galactic and extragalact point source Faraday Rotation Measures. Preliminary results on the Galactic magneti ... More
Presented by Mr. Ronnie JANSSON on 5 Jul 2007 at 11:18
Type: Poster Session: Posters 1 + Coffee
Track: SH.1.6 Board #: 191 (10A)
A strong magnetic storm occurred in January 21st, 2005. During this magnetic storm, fluxes of electrons trapped in the radiation belt were observed simultaneously with two low altitude satellites, CORONAS-F and SERVIS-1 and some geostationary satellites, LANLs. During under developing of the magnetic storm, both of the velocity and the dynamic pressure of solar wind increased by two discrete s ... More
Presented by Dr. Makoto HAREYAMA on 4 Jul 2007 at 14:45
Type: Oral Session: OG 1.4
Track: OG.1.4
The magnetic trapping acceleration is a new type of particle trapping and acceleration in which, in principle, test particles are accelerated indefinitely. A model of magnetized plasma clouds is used to simulate a shock-type wave. The attainable energies of test particles trapped by the moving magnetic neutral sheets are investigated by analytical and numerical methods. To account for ... More
Presented by Prof. Satoshi TAKEUCHI on 5 Jul 2007 at 12:53
Type: Oral Session: OG 1.4
Track: OG.1.4
We present preliminary results of Particle-In-Cell simulations of magnetic turbulence production by isotropic cosmic ray nucleons streaming upstream of supernova remnant shocks. The studies aim at testing the MHD predictions by Bell (2004, 2005) of a strong amplification of short-wavelength nonresonant wave modes and at studying the the subsequent evolution of the magnetic turbulence and its b ... More
Presented by Dr. Jacek NIEMIEC on 5 Jul 2007 at 13:05
Type: Poster Session: Posters 3 + Coffee
Track: SH.3.2 Board #: 174 (9A)
We discuss the improving of the semi-empirical model of cosmic ray (CR) modulation proposed by us previously. In order to describe the long-term variations with more complete reflection in the CR modulation of the complex interaction of global and local solar magnetic fields it has been proposed to introduce into the model the next characteristics: the solar magnetic field polarity, the integr ... More
Presented by Dr. Raisa GUSHCHINA on 9 Jul 2007 at 14:45
Type: Oral Session: Public Hess Lecture
Track: Special
The history of life in our planet has not always been a process of gradual evolution. In fact, the study of fossils throughout the different geological eras has revealed that occasionally numerous species disappear abruptly. In five of the extinctions that have been identified in the last 550 million years more than half of the species disappeared in a short time. The last of these mass extinct ... More
Presented by Prof. Arcadio POVEDA on 10 Jul 2007 at 19:30
Type: Oral Session: HE 2.3
Track: HE.2.3
We perform a study of the ultra high energy neutrino detection performances of a km^3 Neutrino Telescope sitting at the three proposed sites for ANTARES, NEMO and NESTOR in the Mediterranean sea. We focus on the effect of the underwater surface profile on the total amount of yearly expected tau and mu crossing the fiducial volume in the limit of full detection efficiency and energy resol ... More
Presented by Dr. Ofelia PISANTI on 5 Jul 2007 at 10:30
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.1 Board #: 029 (2A)
A magnetic detector such as MINOS which is measuring the sign of muons has to deal with issues of bending, which depend on the magnetic field configuration, and multiple scattering, which depends on the amount of material which is traversed. Above some momentum which depends on these factors, the momentum cannot be resolved. Issues related to measurement of the muon charge ratio in the ... More
Presented by Dr. Maury GOODMAN on 9 Jul 2007 at 14:45
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 116 (6B)
In the analysis of Imaging Air Cerenkov Telescope (IACT) data, offset and/or extended source observations require more sophisticated schemes for determining the presence and statistical significance of any excess gamma ray signal than the standard Li and Ma On-Off technique that has been conventionally used in the analysis of point sources. Although arrays of multiple telescopes have muc ... More
Presented by Dr. Glenn SEMBROSKI on 9 Jul 2007 at 14:45
Type: Poster Session: Posters 1 + Coffee
Track: HE.1.4.B Board #: 070 (4A)
We introduce a new Maximum Likelihood method for analyzing cross correlations between a catalog of candidate astrophysical sources and Ultrahigh Energy Cosmic Rays (UHECRs), which allows for variable source luminosities and provides a ranking of individual sources according to their likelihood of having emitted the correlated UHECRs. We use simulated data to test the validity of this and the ... More
Presented by Mr. Ronnie JANSSON on 4 Jul 2007 at 14:45
Type: Oral Session: OG 1.1
Track: OG.1.1
Due to energy losses in the interstellar medium, cosmic ray electrons at TeV energies carry information on local (within a few hundred parsecs) accelerators. However, measurements of the spectrum of the cosmic ray electrons beyond 1 TeV are extremely difficult due to the rapidly declining flux and the much more numerous background of nucleonic cosmic rays. The very large collection ... More
Presented by Mrs. Kathrin EGBERTS on 4 Jul 2007 at 11:18
Type: Poster Session: Posters 2 + Coffee
Track: SH.3.6 Board #: 207 (10B)
Nowadays, the information on the flux of cosmic ray neutrons has become very important for the computer technology. Since the reduction of LSI (large scale integrated circuit) scaling proceeds, the effect of cosmic ray neutrons becomes significant. Neutrons hit the LSI of the computer and make pseudo signals and false data. This phenomenon is known as the soft error of the computer. The soft e ... More
Presented by Dr. Ryozo TAKASU on 6 Jul 2007 at 14:45
Type: Oral Session: HE 3.1
Track: HE.3.1
Properties of high-energy hadronic interactions can be studied by measurements of the attenuation lengths of hadrons in air showers. The hadronic, electromagnetic, and muonic components of air showers are registered with the KASCADE-Grande experiment. Different methods are applied to derive attenuation lengths of hadrons from the measurements. a) The flux of unaccompanied hadrons at ground l ... More
Presented by Dr. Joerg HOERANDEL on 9 Jul 2007 at 12:17
Type: Oral Session: HE 2.2
Track: HE.2.2
We found 140 neutrino-induced muons in 854.24 live days in the MINOS far detector, which has an acceptance for neutrino-induced muons of 6.9e6 cm**2 sr. We looked for evidence of neutrino disappearance in this data set by computing the ratio of the number of low momentum muons to the sum of the number of high momentum and unknown momentum muons for both data and Monte Carlo expectation in the ... More
Presented by Prof. Stuart MUFSON on 7 Jul 2007 at 13:17
Type: Oral Session: HE 2.1
Track: HE.2.1
The 980 ton MINOS Near Detector is located at the end of the NuMI beam facility at Fermilab in a 100 m deep underground cavern. It was designed to study neutrino oscillations with the Fermilab NuMI beam in conjunction with the MINOS Far Detector. The magnetized Near Detector has been recording charge-separated atmospheric cosmic-ray muons since January 2005. A preliminary measurement of the Mu ... More
Presented by Dr. Jeffrey DE JONG on 5 Jul 2007 at 08:54
Type: Oral Session: OG 1.1
Track: OG.1.1
Observations of Ultra-Heavy galactic cosmic rays (GCR) help to distinguish the possible origins of GCRs. The Trans-Iron Galactic Element Recorder (TIGER) is designed to measure the charge (Z) and energy of GCRs using a combination of scintillation counters, Cherenkov counters, and a scintillating fiber hodoscope. The two Cherenkov radiators, one acrylic and one aerogel, provide TIGER with an ... More
Presented by B. F. RAUCH on 4 Jul 2007 at 11:06
Type: Oral Session: HE 1.4.A
Track: HE.1.4.A
At the southern site of the Pierre Auger Observatory, which is close to completion, an exposure that significantly exceeds the largest forerunner experiments has already been accumulated. We report a measurement of the cosmic ray energy spectrum based on the high statistics collected by the surface detector. The methods developed to determine the spectrum from reconstructed observables are des ... More
Presented by Dr. Markus ROTH on 4 Jul 2007 at 11:06
Type: Oral Session: HE 1.4.A
Track: HE.1.4.A
We report on the cosmic ray spectrum obtained using the inclined events detected with the Pierre Auger Observatory. Showers with zenith angles between 60$^\circ$ and 80$^\circ$ recorded in the period between January 1st, 2004 and December 31st, 2006 are analysed. Showers are first reconstructed in arrival direction and then fitted to density maps of the muon numbers obtained from $10^{19}$eV s ... More
Presented by Mrs. Pedro FACAL on 4 Jul 2007 at 11:18
Type: Poster Session: Posters 1 + Coffee
Track: HE.1.2.A Board #: 042 (2B)
The ARGO-YBJ experiment is a full coverage EAS-array installed at the YangBaJing Cosmic Ray Laboratory (4300 m a.s.l., Tibet, P.R. China). We present the results on the angular resolution measured with different methods with the full central carpet ($\sim$5800 m$^2$). The comparison of experimental results with MC simulations is discussed.
Presented by Dr. Elvira ROSSI on 4 Jul 2007 at 14:45
Type: Oral Session: OG 2.5
Track: OG.2.5
Potential sources for the ultrahigh energy cosmic ray flux are extragalactic source types such as active galactic nuclei and gama ray busts. With the prediction of hadronic processes in these sources, a diffuse neutrino flux ca be produced together with the charged cosmic ray component. To measure this diffuse neutrino flux is one of the main goals of the Antarctic Muon And Neutrino Detector ... More
Presented by Jan LUENEMANN on 9 Jul 2007 at 12:05
Type: Oral Session: HE 1.4.A
Track: HE.1.4.A
Three years of data collected with the fluorescence detector in coincidence with at least one station of the surface detector array ('hybrid data') are used to measure the flux and energy spectrum of cosmic rays above about 10^{18}eV. The hybrid measurement extends the spectrum measured with the surface detector data alone towards lower energies, and provides a cross-check in the overlap regio ... More
Presented by Dr. Lorenzo PERRONE on 4 Jul 2007 at 11:30
Type: Oral Session: HE 2.1
Track: HE.2.1
The complete 5.4 kton MINOS far detector has been taking charge-separated cosmic ray muon data since the beginning of August, 2003 at a depth of 2070 meters water-equivalent in the Soudan mine, Minnesota. The data with both normal and reversed magnetic field running configurations were combined to minimize residual systematic errors in the charge ratio. Using the map of the Soudan rock overb ... More
Presented by Prof. Stuart MUFSON on 5 Jul 2007 at 09:18
Type: Oral Session: OG 1.3, OG 1.5
Track: OG.1.3
The balloon-borne cosmic-ray experiment CREAM-I (Cosmic-Ray Energetics And Mass) completed a successful 42-day flight during the 2004-2005 NASA/NSF/NSBF Antarctic expedition. CREAM-I combines an imaging calorimeter with charge detectors and a precision transition radiation detector (TRD). The TRD component of CREAM-I is targeted at measuring the energy of cosmic-ray particles with charges grea ... More
Presented by Prof. Scott WAKELY on 6 Jul 2007 at 08:30
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.1 Board #: 007 (1A)
High-statistics data collected with Russian-Italian coordinate detector DECOR are analyzed. Precise measurements of muon angular distributions in zenith angle interval from 20 to 90 degrees have been performed. In total, more than 160 million muons are selected. Dependences of the absolute integral muon intensity on zenith angle for several threshold energies ranging from 1.7 GeV up to 7 GeV a ... More
Presented by Dr. Igor YASHIN on 9 Jul 2007 at 14:45
Type: Poster Session: Posters 1 + Coffee
Track: HE.1.4.A Board #: 031 (2A)
The air fluorescence detectors (FDs) of the Pierre Auger Observatory are vital for the determination of the energy scale. To compensate for variations in atmospheric conditions that affect shower energy determination, Auger has instituted an extensive atmospheric monitoring program. The program includes a Central Laser Facility (CLF) and an Extreme Laser Facility (XLF) to provide the FDs with ... More
Presented by Mr. Seveg BEN ZVI on 4 Jul 2007 at 14:45
Type: Oral Session: OG 1.2
Track: OG.1.2
Important information pertaining to the origin of high-energy cosmic rays can be gained by studying their mass composition in the region of the knee (~3 PeV). Thus, air showers have been observed at the South Pole using the SPASE-2 surface array, which measures the electron-component, and the AMANDA-2 neutrino telescope, which measures the coincident muon-component. These two components, t ... More
Presented by Dr. Chihwa SONG on 4 Jul 2007 at 12:41
Type: Oral Session: OG 1.5
Track: OG.1.5
We present here the capabilities of the GLAST Large Area Telescope to detect cosmic ray high-energy (HE) electrons in the energy range from 10 GeV to 1 TeV. We also discuss the science topics that can be investigated with HE electron data and quantify the results with LAT instrument simulations. The science topics include CR propagation, calibration of the IC gamma-ray model, testing hypothese ... More
Presented by Dr. Alexander MOISEEV on 6 Jul 2007 at 12:29
Type: Oral Session: OG 2.1, OG 2.2
Track: OG.2.1
Diffuse gamma radiation produced in the interaction of cosmic-ray particles with matter and radiation in the Galaxy can be used for probing the origin of cosmic rays. The large field of view and long observation time of the Milagro Gamma-Ray Observatory-- a water Cherenkov detector that operates continuously, detecting extensive air showers from the overhead sky -- is an ideal instrument f ... More
Presented by Dr. Petra HUENTEMEYER on 4 Jul 2007 at 09:18
Type: Poster Session: Posters 1 + Coffee
Track: HE.1.3.A Board #: 018 (1B)
Ionization loss of electrons in atmosphere, as a corresponding fraction of extensive air shower (EAS) energy dissipated along cascading, amounts to a major part of the primary particle energy. It has been shown that there is a relation between the loss and the total flux of air Cherenkov light induced by relativistic electrons where the model dependence is parameterized by the shower max ... More
Presented by Dr. Anatoly IVANOV on 4 Jul 2007 at 14:45
Type: Oral Session: HE 1.4.B
Track: HE.1.4.B
The two-point autocorrelation function of ultra-high energy cosmic ray (UHECR) arrival directions has a broad maximum around 25 degrees, combining the data with energies above $4\times 10^{19}$ eV (in the HiRes energy scale) of the HiRes stereo, AGASA, Yakutsk and SUGAR experiments. This signal is not or only marginally present analyzing events of a single experiment, but becomes significant ... More
Presented by Prof. Michael KACHELRIESS on 7 Jul 2007 at 08:30
Type: Poster Session: Posters 2 + Coffee
Track: SH.3.6 Board #: 190 (10A)
The method of the analysis of data on vertical rigidities of cosmic rays cutoff is described. The essence of the method consists in the fact, that both the experimental data and the calculation results are described in the form of change of their value relative to the values related to IGRF. The value of these relative changes quite certainly depends on the rigidity itself and on the level ... More
Presented by Dr. Boris Yu. YUSHKOV on 6 Jul 2007 at 14:45
Type: Oral Session: SH 1.8
Track: SH.1.8
The new statistical method for search of weak signals of the various natures is offered. This method is applied, when average value of a signal does not give statistically significant excess over an average background of the device. The method uses property of statistical distributions to increase number of the large fluctuations in the mentioned above case. In result a noticeable change of d ... More
Presented by Prof. Leonty MIROSHNICHENKO on 6 Jul 2007 at 11:06
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.3 Board #: 065 (4A)
The balloon-borne ANITA high energy neutrino telescope successfully launched on December 15, 2006 and flew for a little less than 35 days. Its primary mission is to detect astrophysical neutrinos with energies in excess of 10^19 eV. Neutrino interactions in Antarctic ice produce short, intense radio pulses that are detected by ANITA at distances as large as 600 km. The usual detection scena ... More
Presented by Prof. Steven BARWICK on 9 Jul 2007 at 14:45
Type: Oral Session: SH 1.8
Track: SH.1.8
Milagro is a ground-based TeV gamma-ray telescope in the Jemez mountains near Los Alamos NM. Designed to image TeV gamma-ray sources, it is also sensitive to energetic solar particles above the local geomagnetic cutoff. It sits relatively close to the Climax neutron monitor in Colorado. Because of their geomagnetic proximity, these two instruments can be jointly used to construct a time-dep ... More
Presented by Mr. Trevor MORGAN on 6 Jul 2007 at 13:05
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 113 (6A)
Each of the VERITAS telescopes has 345 adjustable glass facets which were manufactured by D.O.T.I., Roundrock, Texas with slumping and grinding to get the optical figure. The facets were aluminized and anodized at the Whipple Observatory. The parameters (reflectivity, focal length and blur circle) were measured. The design specifications for focal length (12.00 m +/- 1%) and spot size (< 10 ... More
Presented by J. PERKINS on 9 Jul 2007 at 14:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.1 Board #: 053 (3B)
The MAGIC Collaboration operates the 17m imaging Cherenkov telescope on the Canary island La Palma. The main goal of the experiment is an energy threshold below 100 GeV for primary gamma rays. The new analysis technique (model analysis) takes advantage of the high resolution (both in space and time) camera by fitting the averaged expected templates of the shower development to the measured sho ... More
Presented by Mr. Daniel MAZIN on 9 Jul 2007 at 14:45
Type: Poster Session: Posters 3 + Coffee
Track: SH.3.1 Board #: 177 (9A)
The heliospheric interface is calculated using a three-fluid hydrodynamic model. Using this approach the effects of different solar wind profiles, as they may occur during different levels of solar activity, on the heliospheric structure and the distribution of hydrogen and pickup ions are calculated self-consistently. We present a time dependent parameter study with respect to the solar w ... More
Presented by Dr. Stefan FERREIRA on 9 Jul 2007 at 14:45
Type: Poster Session: Posters 1 + Coffee
Track: OG.1.5 Board #: 097 (5B)
Elaboration of a multipurpose astrophysical orbital observatory (MAOO) INCA is continued. The MAOO is designed on basis of ionization-neutron calorimetry for the direct study of spectra and composition of high-energy primary cosmic radiation in the range ~1011 –1016 eV. Scientific goals of the project are discussed, namely, measurements of (a) the PCR charge composition and energy spectra of ... More
Presented by Prof. Rauf MUKHAMEDSHIN on 4 Jul 2007 at 14:45
Type: Oral Session: SH 3.2
Track: SH.3.2
The diurnal variations of GCR intensity observed by the ground NM stations represent the anisotropic GCR flow at 1 AU. It is generally believed that the variation of the local time of the GCR maximum intensity (phase) has 22-year period of two sunspot cycles. However, there even exists doubt on such anisotropy variation cycle. Those different interpretations come from the lack of enough ... More
Presented by Prof. Yu YI on 9 Jul 2007 at 11:18
Type: Poster Session: Posters 1 + Coffee
Track: SH.1.6 Board #: 166 (8B)
The Ulysses spacecraft was close to the ecliptic at ~5 AU during the periods of enhanced solar activity in January and September 2005. The KET/Ulysses instrument registers a flux of cosmic ray protons within 5-2000 MeV, fluxes have been disturbed more than three solar rotations during the considered period. We find two periods of 27 days, when disturbances from the active region have bee ... More
Presented by Dr. Alexei STRUMINSKY on 4 Jul 2007 at 14:45
Type: Oral Session: SH 3.5,SH 5.1, SH 5.2
Track: SH.3.5
The energy spectra of protons in the 1-100 MeV range are studied under quiet solar activity periods during the 21st - 23rd cycles using data sets from near- Earth spacecraft. A series of low-flux spectra is approximated by the form J(E) =AE(^-g)+CE^n, the two terms describing solar/heliospheric and galactic components, respectively. By determining the best fitting parameters to the energy ... More
Presented by Dr. Karoly KECSKEMETY on 10 Jul 2007 at 10:30
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 109 (6A)
The Milagro gamma-ray observatory is a water-Cherenkov detector capable of observing air showers produced by very high energy gamma-rays. The sensitivity and performance of the detector is determined by a detailed Monte Carlo simulation and verified through the observation of gamma-ray sources and the isotropic cosmic-ray background. Corsika is used for simulating the extensive air showers pr ... More
Presented by Mr. Vlasios VASILEIOU on 9 Jul 2007 at 14:45
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 108 (6A)
MAGIC-II, a two 17m telescope system, will start operating at La Palma in the fall of 2007. Its main goal is to improve the sensitivity in the stereoscopic/coincident operational mode. At the same time it will lower the analysis threshold of the currently running single MAGIC telescope. Results from the Monte Carlo simulations of this system will be discussed. A comparison of the two telescope ... More
Presented by Mr. Nepomuk OTTE on 9 Jul 2007 at 14:45
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 117 (6B)
The Very High Energy Telescope Array (VERITAS) is a system of four imaging Cherenkov telescopes located at the Fred Lawrence Whipple Observatory in southern Arizona. We present here results of detailed Monte Carlo simulations of the array response to extensive air showers. Cherenkov image and shower parameter distributions are calculated and show good agreement with distributions obtained from ... More
Presented by Dr. Gernot MAIER on 9 Jul 2007 at 14:45
Type: Oral Session: OG 1.3, OG 1.5
Track: OG.1.3
This talk present preliminary results for the time-dependent cosmic-ray propagation in the Galaxy by a fully 3-dimensional Monte Carlo simulation. The distribution of cosmic-rays (both protons and helium nuclei) in the Galaxy is studied on various spatial scales for both constant and variable cosmic-ray sources. The continuous diffuse gamma-ray emission produced by cosmic-rays during the ... More
Presented by Prof. Martin POHL on 6 Jul 2007 at 09:18
Type: Oral Session: SH 3.2
Track: SH.3.2
A bimodal distribution around the sunspot cycle maximum was suggested to exit for solar-terrestrial parameters (Storini et al., Adv. Space Res. 31, n° 4, 895- 900, 2003). The period between the two activity peaks was called the Gnevyshev Gap by the Rome Cosmic Ray Group (Storini and Pase, GBRSC News 5, Special Issue, 255-258, 1995) and it is world-wide accepted by the scientific communit ... More
Presented by Dr. MARISA STORINI on 9 Jul 2007 at 11:30
Type: Oral Session: OG 2.2
Track: OG.2.2
The H.E.S.S. source J1809-193 was discovered in 2006 in data of the Galactic Plane survey, followed by several re-observations. It shows a hard gamma-ray spectrum and the emission is clearly extended. Its vicinity to PSR J1809-1917, a high spin-down luminosity pulsar powerful enough to drive the observed gamma-ray emission, makes it a plausible candidate for a Pulsar Wind Nebula. On the other ... More
Presented by Nukri KOMIN on 6 Jul 2007 at 08:54
Type: Oral Session: HE 2.3
Track: HE.2.3
AMANDA is a high volume neutrino telescope designed to search in the down-going direction for muons from astrophysical muon-neutrinos. It is possible to extend the range of AMANDA to search for neutrinos with extremely high energies. The atmospheric neutrino flux becomes negligible above 10^15 eV, so this value serves as rough energy threshold for this search. Above 10^16 eV the Earth is ess ... More
Presented by Lisa GERHARDT on 5 Jul 2007 at 11:30
Type: Poster Session: Posters 2 + Coffee
Track: OG.2.3 Board #: 166 (8B)
The high-frequency peaked BL Lac PG 1553+113 was discovered by H.E.S.S. to be a emitter of VHE (>100 GeV) gamma rays during ~8 hours of observations in 2005. The AGN was observed again by H.E.S.S in 2006. A total of ~17 hours of additional data were taken. In addition, observations using the VLT Sinfoni instrument were made to determine the presently unknown redshift of PG 1553+113. Res ... More
Presented by Dr. Wystan BENBOW on 6 Jul 2007 at 14:45
Type: Oral Session: HE 2.5
Track: HE.2.5
The EEE (Extreme Energy Event) Project is an extensive air shower experiment devoted to the study of very high energy events through the detection at ground of the muon component of the shower. The detectors are installed inside many Italian High Schools, involving students in the experiment. The detector used is a tracking telescope made of 3 planes of Multi-gap Resistive Plate Chambers (MRPC ... More
Presented by Giovanni IMPONENTE on 7 Jul 2007 at 10:54
Type: Poster Session: Posters 2 + Coffee
Track: OG.2.3 Board #: 123 (6B)
Since their discovery as VHE emitters by H.E.S.S. in 2004, the high-energy peaked BL Lacs PKS 2005-489 and H 2356-309 have been monitored at VHE to study their flux and spectral variability. To sample their SED, several multiwavelength campaigns with X-ray satellites have been performed, showing important spectral changes. Here we present the results of 3 years of H.E.S.S. observations to ... More
Presented by Dr. Luigi COSTAMANTE on 6 Jul 2007 at 14:45
Type: Poster Session: Posters 2 + Coffee
Track: OG.2.3 Board #: 173 (9A)
High redshift massive protogalaxies, the sites of early star formation in the Universe, provided a suitable environment for the formation of the first supermassive black holes. Mass accretion causes the black hole to grow and become a gamma-ray blazar for those observers privileged by a line of sight parralel to the jet. Possible evolutionary sequences are explored in terms of their visibili ... More
Presented by Dr. Alberto CARRAMINANA on 6 Jul 2007 at 14:45
Type: Oral Session: HE 1.2.A
Track: HE.1.2.A
A large area streamer tube detector (128m^2), located within the KASCADE- Grande Experiment, has been built with the aim to identify muons (E>0.8GeV) and their direction in extensive air showers. Besides the investigation of the muon pseudorapitity in EAS, the application of the tracking detector in reconstructing the muon production height is evaluated. The combination of the muon production ... More
Presented by Dr. Paul DOLL on 6 Jul 2007 at 12:17
Type: Oral Session: SH 3.6
Track: SH.3.6
Muon diagnostics is a new technique of remote monitoring and forecasting of the development of various dynamic processes in the heliosphere and in the atmosphere and magnetosphere of the Earth based on the analysis of spatial- angular and temporal variations of muon flux simultaneously detected from all directions of upper hemisphere. For practical realization of the technique multi- direc ... More
Presented by Dr. Dmitry TIMASHKOV on 7 Jul 2007 at 08:54
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.2 Board #: 004 (1A)
Data collected during the year 2006 by the first 9 strings of IceCube have been used to measure the energy spectrum of the atmospheric neutrino flux. Atmospheric neutrinos, an important scientific output by itself (for instance, to understand the high-energy hadronic interaction models), are also fundamental in order to check the performance of the detector and to estimate the background for ... More
Presented by Dr. Juan-de-Dios ZORNOZA on 9 Jul 2007 at 14:45
Type: Oral Session: SH 3.6
Track: SH.3.6
Measurements of muon flux in the atmosphere have been performed by Lebedev Physical Institute during sea expeditions in November, 1975 - March, 1976 period. This survey covered a wide range of latitudes with geomagnetic cutoff rigidities Rc from 0.8 up to 14.2 GV. The data on muon flux as a function of atmospheric depth ( X~ 10-1000 g/cm2) were obtained. On the other hand based on ... More
Presented by Dr. Vladimir MAKHMUTOV on 7 Jul 2007 at 09:06
Type: Oral Session: HE 1.3.A
Track: HE.1.3.A
Inclined showers (i.e. showers with zenith angle above 40 degrees) are registered by the KASCADE-Grande experiment, which is designed to address fundamental questions about the origin, composition and acceleration mechanisms of primary cosmic rays between $10^{14}$ and $10^{18}$ eV. Despite the aggravate reconstruction due to the thin scintillation detectors used in KASCADE-G ... More
Presented by Dr. Juan Carlos ARTEAGA-VELAZQUEZ on 6 Jul 2007 at 12:42
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.1 Board #: 055 (3B)
A review of measurements of the muon energy spectra for different altitudes, height and directions performed with devices placed at various geomagnetic latitudes is presented. The theoretically motivated final fit to the existing experimental differential and integral data will be presented. The muon spectra and the muon charge ratio, defined as the ratio of positive to negative muon fluxes, a ... More
Presented by Prof. Janusz KEMPA on 9 Jul 2007 at 14:45
Type: Oral Session: SH 1.6, SH 1.7, SH 2.2, SH 2.3
Track: SH.2.3
We combined solar wind observations from five different spacecraft: Helios 1, Helios 2, IMP-8, Voyager 1 and Voyager 2, from November 1977 to February 1978, to study the structure of the solar wind streams and the propagation of interplanetary shocks, interaction regions and ejecta. Comparing the in-situ observations is possible to illuminate some aspects of these events such as their longitud ... More
Presented by Dr. Gonzalez-Esparza AMERICO on 5 Jul 2007 at 11:30
Type: Poster Session: Posters 1 + Coffee
Track: OG.1.5 Board #: 087 (5A)
The NASA Balloon program offers a unique, reliable and low cost platform for conducting cutting edge cosmic ray research and scientific investigations. Recently, the balloon program completed new payload support facilities in Antarctica. In addition, during the 2007 Campaign, for the first time, NASA demonstrated the ability to launch three science payloads in the same season. These Anta ... More
Presented by Dr. Magdi SAID on 4 Jul 2007 at 14:45
Type: Oral Session: SH 3.2
Track: SH.3.2
We calculate the temporal changes of the exponent g of the power law rigidity R spectrum of the GCR isotropic intensity variations using neutron monitors experimental data for four 11-year cycles of solar activity (1960–2002). The temporal changes of the power law rigidity spectrum exponent g of the GCR isotropic intensity variations are inversely correlated with the changes of the GCR ... More
Presented by Prof. Michael ALANIA on 9 Jul 2007 at 11:06
Type: Oral Session: OG 2.2
Track: OG.2.2
Nonlinear kinetic theory of cosmic ray acceleration in supernova remnants is used to investigate the properties of Kepler's SNR and, in particular, to predict the gamma-ray spectrum expected from this SNR. Observations of the non-thermal radio and X-ray emission spectra as well as theoretical constraints for the total supernova explosion energy are used to constrain the astronomical and part ... More
Presented by Dr. Leonid KSENOFONTOV on 6 Jul 2007 at 08:30
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.2 Board #: 039 (2B)
The Main Injector Neutrino Oscillation Search (MINOS) long baseline experiment has been actively taking beam data since 2005, having already accumulated 2.6E20 protons-on-target. MINOS uses the most powerful neutrino beam currently in operation measured in two locations: a Near detector at Fermilab, close to beam production, and a Far detector, 735 km downstream, in Northern Minnesota. Alth ... More
Presented by Dr. Alexandre SOUSA on 9 Jul 2007 at 14:45
Type: Oral Session: HE 2.2
Track: HE.2.2
The Main Injector Neutrino Oscillation Search (MINOS) long baseline experiment has been actively taking beam data since 2005, having already accumulated 2.6E20 protons-on-target. MINOS uses the most powerful neutrino beam currently in operation measured in two locations: at Fermilab, close to beam production, and 735 km downstream, in Northern Minnesota. By observing the oscillatory structur ... More
Presented by Dr. Alexandre SOUSA on 7 Jul 2007 at 12:05
Type: Oral Session: OG 2.5
Track: OG.2.5
Fourth generation neutrino telescopes are now being constructed (IceCube) and designed (KM3NET). While no neutrino flux of cosmic origin has been discovered so far, the first weak signals are expected to be discerned in the next few years. Multi-messenger investigations aim at addressing the problem of extracting these signals from irreducible backgrounds. One possible application is the searc ... More
Presented by Elisa BERNARDINI on 10 Jul 2007 at 12:53
Type: Poster Session: Posters 1 + Coffee
Track: HE.1.4.B Board #: 066 (4A)
A simple model of a homogeneous population of cosmic accelerators injecting protons following a unique power law has long been shown to fit the HiRes monocular data very well. The model evolves the sources with redshift and adjusts both the redshift evolution and the exponent in the injecting power law to fit the data. At lower energies galactic iron is added in as suggested by composition mea ... More
Presented by Mrs. Olga BRUSOVA on 4 Jul 2007 at 14:45
Type: Oral Session: OG 2.5
Track: OG.2.5
Hadronic interactions of cosmic protons and nuclei with the ambient gas lead to the production of both neutrinos and gamma-rays. Both types of secondary particles can be used to provide information on sites of cosmic-ray acceleration. As messengers gamma-rays have a clear advantage in that sensitive detectors can be readily constructed. However, despite the difficulty of experimental neutrino ... More
Presented by Mr. Christian STEGMANN on 10 Jul 2007 at 12:17
Type: Poster Session: Posters 2 + Coffee
Track: SH.3.6 Board #: 180 (9B)
The space weather refers to conditions on the sun, solar wind and Earth’s magnetosphere and ionosphere. Several characteristic signatures in cosmic ray may be used for space weather applications on the basis of secondary cosmic ray neutron data. Good examples are the solar proton events and Geomagnetic storms. A possible tool for investigations from Earth the variation of cosmic ray flux is ... More
Presented by Dr. alexander MISHEV on 6 Jul 2007 at 14:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.3 Board #: 049 (3A)
One of the physics goals in SK-III is the observation of relic supernova neutrinos from the identification of their electron anti-neutrino component. Application of the delayed coincidence method benefits as a powerful tool in the selection of an electron anti-neutrino with largely reduced background. This selection is accomplished by detecting both a positron and a neutron created in the inv ... More
Presented by Dr. Hideki WATANABE on 9 Jul 2007 at 14:45
Type: Oral Session: SH 1.8
Track: SH.1.8
The neutron multiplicity changes on the neutron monitor in Barentsburg (Spitsbergen) during the GLE December 13, 2006 has been studied. The neutron monitor in Barentsburg was put into operation on April, 2003. In 2006 it has found the complete configuration 18-NM-64. The new data collecting system based on a digital ADLINK 7233 card allows to register both pulses, and intervals between t ... More
Presented by Prof. Eduard VASHENYUK on 6 Jul 2007 at 11:30
Type: Oral Session: OG 2.2
Track: OG.2.2
The deeper and more extended scan of the Galactic Plane by H.E.S.S. during 2005 and 2006 has revealed a number of new point-like as well as extended sources. We will present and discuss cases where the VHE emission detected by HESS could be associated to pulsar wind nebulae around young pulsars in our Galaxy.
Presented by Dr. Arache DJANNATI-ATAÏ on 6 Jul 2007 at 10:54
Type: Oral Session: OG 2.3, 2.4
Track: OG.2.3
The star and galaxy formation history has left an imprint on the diffuse extragalactic radiation field in the ultraviolet to infrared wavelength regime. In the spectral energy distribution two distinct bumps are expected: A first bump in the optical to near-infrared coming from direct starlight redshifted over time and a second bump in the infrared from dust-reemission. Direct measurements o ... More
Presented by Mr. Martin RAUE on 10 Jul 2007 at 08:54
Type: Oral Session: OG 2.2
Track: OG.2.2
The H.E.S.S. 2004-2005 survey of the Galactic Plane at energies above 200 GeV had revealed a number of pulsar wind nebulae candidates, including the remarkable source HESS J1825-137. Spatially resolved spectral measurements of this source gave the first evidence of an energy-dependent morphology which was interpreted as being due to the cooling of relic electrons cumulated throughout pul ... More
Presented by Dr. anne LEMIERE on 6 Jul 2007 at 08:42
Type: Oral Session: Plenaries 2
Track: Special
Approximately 20 years ago it was discovered that the largest solar energetic particle (SEP) events are closely associated with Coronal Mass Ejections (CMEs) in which the Sun suddenly ejects a billion tons of material at speeds that can exceed 2500 km/sec. The past solar maximum provided the opportunity to study the connection between CMEs and SEPs using SOHO images and SEP data from near-Eart ... More
Presented by Dr. Richard A. MEWALDT on 5 Jul 2007 at 17:25
Type: Oral Session: HE 1.2.A
Track: HE.1.2.A
A new approach to investigations of ultra-high energy cosmic rays based on the new EAS observable - spectra of local density of muons measured at ground level in a wide range of zenith angles - is considered. It is shown that muon density spectra are sensitive to the primary cosmic ray spectrum and composition, and to features of the forward kinematic region of hadronic interaction, and thus p ... More
Presented by Dr. Igor YASHIN on 6 Jul 2007 at 10:42
Type: Poster Session: Posters 1 + Coffee
Track: HE.1.4.A Board #: 030 (2A)
FRAM - F/(Ph)otometric Robotic Atmospheric Monitor is the latest addition to the atmospheric monitoring instruments of the Pierre Auger Observatory. An optical telescope equipped with CCD camera and photometer, it automatically observes a set of selected standard stars and a calibrated terrestrial source. Primarily, the wavelength dependence of the attenuation is derived and the comparison be ... More
Presented by Dr. Petr TRAVNICEK, on 4 Jul 2007 at 14:45
Type: Poster Session: Posters 1 + Coffee
Track: HE.1.4.B Board #: 045 (3A)
In this work we investigate new statistical parameters to infer the mass composition of high energy cosmic rays above $10^{17}$ eV. Trying to overcome the difficulties imposed by large fluctuations and limited experimental observables, we present a statistical method for composition studies based on several measurable features of the longitudinal and lateral development of the air shower. P ... More
Presented by Dr. Vitor DE SOUZA on 4 Jul 2007 at 14:45
Type: Poster Session: Posters 1 + Coffee
Track: OG.1.5 Board #: 099 (5B)
The Cosmic Ray Energetics And Mass (CREAM) experiment is designed to investigate the source, propagation and acceleration mechanism of high energy cosmic-ray nuclei, by directly measuring their energy and charge. Incorporating a transition radiation detector (TRD) provides an energy measurement complementary to the calorimeter, as well as additional track reconstruction capability. The next ... More
Presented by Dr. Alexander MALININ on 4 Jul 2007 at 14:45
Type: Oral Session: SH 5.3
Track: SH.5.3
The origin of anomalous cosmic ray ions has long been assumed to be heliospheric pickup ion production from interstellar neutrals and acceleration at the solar wind termination shock. The Voyager-1 shock crossing showed a well-defined boundary for sharply increased keV ion fluxes in the heliosheath but no sign of local acceleration. Ion flux spectra at keV to MeV energies are instead unfolding ... More
Presented by Dr. John F. COOPER on 10 Jul 2007 at 12:05
Type: Oral Session: SH 3.1
Track: SH.3.1
An improved nonlinear theory for the perpendicular transport of charged particles is presented. This approach is based on an improved nonlinear treatment of field-line random walk in combination with a generalized compound diffusion model. The generalized compound diffusion model employed is much more systematic and reliable, in comparison to previous theories such as the nonlinear guiding cen ... More
Presented by Dr. Andreas SHALCHI on 9 Jul 2007 at 08:30
Type: Oral Session: OG 2.2
Track: OG.2.2
We present the results of an analysis of Chandra and RXTE X-ray spectral data for the supernova remnant Cas A. Thousands of Chandra spectra for roughly arcsecond-sized regions were fitted with a simple model that includes a bremsstrahlung continuum and several Gaussian emission lines. The results of this analysis reveal that the faint, narrow filaments around the outer edge of the remnant hav ... More
Presented by Dr. Glenn ALLEN on 4 Jul 2007 at 12:17
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.5 Board #: 071 (4A)
In 80th a new type of APDs with negative local feedback which significantly reduces the excess noise factor introduced by the avalanche process - the metal-resistive layer-semiconductor (MRS) APDs - were developed in INR (Moscow) by Sadygov et al. in the frameworks of the Soviet DUMAND program led by M.A. Markov. In 90th and during a few last years some new kinds of the Micro-pixel Aval ... More
Presented by Dr. Igor ZHELEZNYKH on 9 Jul 2007 at 14:45
Type: Poster Session: Posters 2 + Coffee
Track: HE.1.6 Board #: 052 (3A)
The future high energy nuclear cosmic ray flux measurements in the upper atmosphere will require large, and thus accurate, corrections for reliable Top of Atmosphere (galactic) fluxes to be derived. In this perspective, the atmospheric corrections are evaluated from the transport calculations of the flux in the atmosphere. The contributions of these corrections to the accuracy of the experimen ... More
Presented by Dr. Laurent DEROME on 6 Jul 2007 at 14:45
Type: Oral Session: HE 1.1.A
Track: HE.1.1.A
We have measured the primary cosmic ray spectra of various nuclear groups by analyzing the relationship between muon multiplicity distribution and air shower size, and we have also estimated their mean mass as a function of primary energy. The shower data were obtained from the four years of observations with the GRAPES-3 air shower experiment, which has a high-density air shower array o ... More
Presented by Dr. Hideki TANAKA on 9 Jul 2007 at 09:06
Type: Oral Session: OG 1.2, OG 1.3
Track: OG.1.3
We present a Monte-Carlo calculation of the propagation of cosmic ray protons in the Galaxy for energies above 1 PeV. We discuss the relative strengths of competing effects such as parallel/perpendicular diffusion and drifts in toy models of the Galaxy. We compare our estimates with the results of the MC calculation for the toy models and then we apply the MC calculation to a few realistic mod ... More
Presented by Dr. Daniel DE MARCO on 5 Jul 2007 at 10:54
Type: Oral Session: SH 3.6
Track: SH.3.6
A direct comparison of impulsive nitrate enhancements observed in multiple polar ice cores from both hemispheres is presented for the years 1940-1950. During that time period, four ground-level solar cosmic ray events (GLEs) were recorded by ionization chambers. We show that large and sudden enhancements in the nitrate records from both hemispheres were observed within weeks of the dat ... More
Presented by Dr. Don SMART on 7 Jul 2007 at 10:30
Type: Oral Session: Rapporteurs
Track: Rapporteurs
Presented by Dr. Pasquale BLASI on 11 Jul 2007 at 09:30
Type: Oral Session: Rapporteurs
Track: Rapporteurs
Presented by Dr. Jim HINTON on 11 Jul 2007 at 12:30
Type: Oral Session: Rapporteurs
Track: Rapporteurs
Presented by Dr. Gavin ROWELL on 11 Jul 2007 at 16:30
Type: Oral Session: SH 2.1
Track: SH.2.1
A strong Forbush Decrease (FD) was observed by ground based neutron monitor at Oulu in the mid of May 2005. The onset of FD took place on May 13 and attained its maximum on May 15, 2005. The event was in response to 221 X-ray flares out of which 13 were of M class and they were followed by coronal mass ejection (CME). This has caused a rapid decrease in galactic cosmic ray intensity call ... More
Presented by Mrs. Manjula JAIN on 5 Jul 2007 at 12:05
Type: Poster Session: Posters 1 + Coffee
Track: SH.1.3 Board #: 175 (9A)
Ions accelerated in solar flares interact with the solar atmosphere to produce gamma-ray lines and neutrons. Some of the neutrons that escape from the Sun into interplanetary space can survive to the Earth and be observed both by satellite detectors and by ground-based neutron detectors. In association with the X12.0 flare on 1991 June 4, solar neutrons were observed in space by OSSE onb ... More
Present