Dr
Songzhan Chen
(Institute of High Energy Physics (IHEP))
28/10/2011, 09:30
The ARGO-YBJ experiment is located at Yang Ba Jing (P.R. China), at 4300 m a.s.l. and atmospheric depth of 606 g/cm^2. It is an air shower detector array with a fully covered layer of Resistive Plate Chambers. It is designed to detect EAS in the primary energy range between few hundred GeV and a few PeV. It has been continuously operated with a duty cycle above 86% since November 2007...
Roberto Iuppa
(INFN, Roma 2)
28/10/2011, 10:00
The ARGO-YBJ experiment, located at the Yangbajing Cosmic Ray Laboratory
(Tibet, 4300 m asl, 606 g/cm2), is an EAS-array exploiting the full
coverage approach at high altitude. We analyzed the data taken since
November 2007 looking for anisotropies in the arrival directions of
cosmic rays on different angular scales. The results of the analysis are
reported and compared with other experiments.
Marcos Santander
(University of Wisconsin-Madison)
28/10/2011, 10:30
The IceCube Neutrino Observatory, located at the geographic South Pole, employs a km3 of Antarctic ice as a particle detector to search for sources of astrophysical neutrinos across the southern sky. The high rate of CR events in the detector has allowed to search for anisotropy in this data sample at the per-mille level. I'll report on the observation of CR anisotropy in the 20 TeV...
Prof.
Alex Lazarian
(UW-)
28/10/2011, 11:20
Magnetic reconnection in realistically turbulent astrophysical environments does not depend on electric conductivity of plasma, but instead is controlled by the degree of turbulent stochasticity of magnetic field lines. Such a reconnection can induce the first order Fermi acceleration of energetic particles. I will show that this acceleration is different in 2D and 3D reconnection with 3D...
Dr
Mikhail Malkov
(University of California, San Diego)
28/10/2011, 11:50
Both the acceleration of cosmic rays (CR) in supernova remnant shocks
and their subsequent propagation through the random magnetic field
of the Galaxy deem to result in an almost isotropic CR spectrum. Yet
the MILAGRO TeV observatory and the IceCube discovered sharp
(~10 deg)
arrival anisotropies of CR nuclei. We suggest a mechanism for producing
such a CR beam which operates en route to...
Prof.
J.R. (Randy) Jokipii
(University of Arizona)
28/10/2011, 12:20
The observed interstellar anisotropies of galactic cosmic rays, and
their energy dependence, are a major source of information concerning
their origin and transport in the galaxy. They also present significant
challenges to our understanding. I will discuss possible
interpretations of some of the anisotropies in terms of interstellar
transport in the interstellar magnetic field and...
Maria Gurtner
(University of Wuppertal)
28/10/2011, 14:30
The AMANDA detector has been operated at the South Pole until 2006 and recorded a total ~9·10^9 muons above ~1 TeV between 2000 and 2006. With a data set of this size, it is possible to probe the southern sky for per-mil anisotropy on all angular scales in the arrival direction distribution of cosmic rays thereby extending anisotropy measurements performed with IceCube.
The data presented...
Dr
Piera Luisa Ghia
(LPNHE (CNRS))
28/10/2011, 15:00
The EAS-TOP Extensive Air Shower array was located at Campo Imperatore (2005 m a.s.l., latitude 42◦27N, longitude 13◦34E, INFN Gran Sasso National Laboratory). It took cosmic ray data in the energy range 10^13 eV-10^16 eV from the end of 1980s up to 2000. A first data-set (including 4 years of data) was exploited for the measurement of the cosmic ray anisotropy at E≈10^14 eV (Ap. J. 470, 1996,...
Roberto Iuppa
(INFN, Roma 2)
28/10/2011, 15:30
EAS array dataset contains signal laying on different angular
scales: point-like and extended gamma-ray sources, as well as large and
intermediate scale cosmic-ray anisotropies. The separation of all these
contributions is crucial, mostly when they overlap with each other.
In recent years, the needlet transform has proved to be an effective tool
in the analysis of cosmological and...
Dr
Segev BenZvi
(University of Wisconsin-Madison)
28/10/2011, 16:00
To measure the per-mille anisotropy in the TeV cosmic rays with a
ground-based experiment, it is necessary to estimate the exposure of the
detector to cosmic ray air showers. The estimate must account for drifts
that occur in the detector during the course of the measurement, as well
as changes in the shower signal at ground level caused by atmospheric
conditions. Due to the difficulty...
Dr
Olivier Deligny
(Institut de Physique Nucléaire Orsay)
28/10/2011, 16:40
Scrutiny of the large scale distribution of arrival directions of cosmic
rays with energies above ~100 PeV is one important observable to provide
key elements for understanding the end of Galactic cosmic rays, and for
establishing at which energy the flux of extragalactic cosmic rays starts
to dominate the cosmic ray energy spectrum. Using the large amount of
data collected by the Pierre...
Dr
Gwenael Giacinti
(NTNU Trondheim and APC Paris)
28/10/2011, 17:10
We propose an explanation for the origin of the observed cosmic ray anisotropies at multiple scales. We discuss its implications, and future perspectives.
Dr
Vlasios Vasileiou
(Laboratoire Univers et Particules de Montpellier)
29/10/2011, 09:00
The Large Area Telescope on board the Fermi satellite detected more than 1.6 million cosmic-ray electrons/positrons with energies above 60 GeV during its first year of operation. The arrival directions of these events were searched for anisotropies of angular scales from ~10deg up to 90deg, and of minimum energy extending from 60GeV up to 480GeV. Two independent techniques were used to search...
Dr
Igor Moskalenko
(Stanford University)
29/10/2011, 09:30
Research in many areas of modern physics such as, e.g., indirect searches for dark matter and particle acceleration in supernova remnant shocks rely heavily on studies of cosmic rays (CRs) and associated diffuse emissions (radio, microwave, X-rays, gamma rays). The numerical Galactic CR propagation code GALPROP has been shown to reproduce simultaneously observational data of many kinds related...
Prof.
Gary Zank
(University of Alabama in Huntsville)
29/10/2011, 10:00
The solar wind interacts with the local interstellar medium via both
ionized and neutral gases. The primary coupling mechanism, charge
exchange between protons and interstellar hydrogen, plays a critical
role in determining the local structure, as does the interstellar
magnetic field. We will describe the basic physical processes
underlying the interaction between the solar wind and...
Prof.
Eun-Suk Seo
(University of Maryland)
29/10/2011, 11:00
Additional information: http://iopscience.iop.org/2041-8205/714/1/L89/
Dr
Mirko Boezio
(INFN Trieste)
29/10/2011, 11:30
After five years of data taking in space, the PAMELA experiment has presented new results on the energy spectra of protons, helium nuclei, electrons and positrons that might change our current understanding of the mechanisms of production, acceleration and propagation of cosmic rays in the Galaxy. In addition, PAMELA measurements of cosmic antiproton and positron fluxes are setting strong...
Prof.
Jörg Hörandel
(Radboud University Nijmegen)
29/10/2011, 12:00
One of the key observables to understand the origin and the sources of Galactic cosmic rays is their elemental composition. The abundance of elements is measured directly with detectors above the atmosphere on balloons and satellites. At energies exceeding 10^14 eV information on the composition is derived from the observation of extensive air showers. Results of recent measurements will be...
Prof.
Pasquale Blasi
(INAF/Osservatorio Astrofisico di Arcetri)
29/10/2011, 12:30
I will discuss the role of anisotropy as a tool to discriminate among different scenarios for the origin of Galactic cosmic rays. The main aim of the presentation is that of stressing the need for a unified picture of acceleration, propagation, chemical composition and anisotropy. I will summarize the different contributions to cosmic ray anisotropies and the problems with current...
Dr
David McComas
(Southwest Research Institute)
29/10/2011, 14:30
This talk summarizes the recent observations of the interaction of the heliosphere with the local interstellar medium as observed remotely by the Interstellar Boundary Explorer (IBEX). IBEX observations have shown that the interaction is far more complex and dynamic than previously anticipated and raised many new questions about this important interaction.
Prof.
Merav Opher
(Boston University)
29/10/2011, 15:00
All current global models of the heliosphere are based on the assumption that the magnetic field in the heliosheath connects back to the Sun. In particular, models of transports of galactic cosmic rays (GCR) assume the heliospheric current sheet is laminar as well. The sectored magnetic field due to the flapping of the heliospheric current sheet compresses across the termination shock and may...
Prof.
Nikolai Pogorelov
(University of Alabama in Huntsville)
29/10/2011, 16:00
The Sun moves through the local interstellar medium (LISM) ejecting charged particles with velocities that eventually become greater
than the fast magnetosonic velocity. A surface separating the LISM material from the solar wind (SW) plasma is called
the heliopause. The SW is decelerated by the heliopause creating a heliospheric termination shock. A region of the
SW plasma between the...
Dr
Priscilla Frisch
(University of Chicago)
29/10/2011, 16:30
Similar directions are obtained for the local interstellar magnetic
field (ISMF) by comparing diverse data that sample five orders of
magnetic in spatial scales. The direction of the ISMF that shapes the
heliosphere, and that is traced by the ribbon of energetic neutral
atoms discovered by the Interstellar Boundary Explorer (IBEX) mission,
is compared to the ISMF direction obtained from...
Dr
Rasha Abbasi
(University of Wisconsin-Madison)
29/10/2011, 17:00
The history of anisotropy measurements has a long history and some attempts at interpretations have already been made.
The early measurements are important in view of giving a check on the validity of the contemporary exciting measurements. So far they seem to confirm and complement them, at least for the large scale anisotropies.
The small scale anisotropies, forming 'striations'...
Dr
Zhang Yi
(Institute of High Energy Physics (IHEP))
The talk will focus focuses on the measurement and analysis of the cosmic ray
anisotropy obtained by Tibet air shower array.
