Anisotropy and Corotation of Galactic Cosmic Rays
- 20 October 2006
- journal article
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 314 (5798) , 439-443
- https://doi.org/10.1126/science.1131702
Abstract
The intensity of Galactic cosmic rays is nearly isotropic because of the influence of magnetic fields in the Milky Way. Here, we present two-dimensional high-precision anisotropy measurement for energies from a few to several hundred teraelectronvolts (TeV), using the large data sample of the Tibet Air Shower Arrays. Besides revealing finer details of the known anisotropies, a new component of Galactic cosmic ray anisotropy in sidereal time is uncovered around the Cygnus region direction. For cosmic-ray energies up to a few hundred TeV, all components of anisotropies fade away, showing a corotation of Galactic cosmic rays with the local Galactic magnetic environment. These results have broad implications for a comprehensive understanding of cosmic rays, supernovae, magnetic fields, and heliospheric and Galactic dynamic environments.Keywords
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This publication has 25 references indexed in Scilit:
- Envelope expansion with core collapse - III. Similarity isothermal shocks in a magnetofluidMonthly Notices of the Royal Astronomical Society, 2006
- A Northern Sky Survey for Steady Tera–Electron Volt Gamma‐Ray Point Sources Using the Tibet Air Shower ArrayThe Astrophysical Journal, 2005
- Evidence for New Unidentified TeV γ-ray Sources from Angularly Correlated Hot Spots Observed by Independent TeV γ-ray Sky SurveysThe Astrophysical Journal, 2004
- An unidentified TeV source in the vicinity of Cygnus OB2Astronomy & Astrophysics, 2002
- Gaussian analysis of two hemisphere observations of galactic cosmic ray sidereal anisotropiesJournal of Geophysical Research, 1999
- Galactic and heliotail‐in anisotropies of cosmic rays as the origin of sidereal daily variation in the energy region < 104 GeVJournal of Geophysical Research, 1998
- Producing the universal spectrum of cosmological gamma-ray bursts with the Klein-Nishina cross sectionThe Astrophysical Journal, 1994
- Search for steady emission of 10-TeV gamma rays from the Crab Nebula, Cygnus X-3, and Hercules X-1 using the Tibet air shower arrayPhysical Review Letters, 1992
- Observation of terrestrial orbital motion using the cosmic-ray Compton–Getting effectNature, 1986
- An Apparent Effect of Galactic Rotation on the Intensity of Cosmic RaysPhysical Review B, 1935