Anisotropy and Corotation of Galactic Cosmic Rays

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.

Cited by in corpus (13)

• Cosmic Rays from the Knee to the Highest Energies
• Discovery of TeV Gamma-Ray Emission from the Cygnus Region of the Galaxy
• Discovery of Localized Regions of Excess 10-TeV Cosmic Rays
• The Large Scale Cosmic-Ray Anisotropy as Observed with Milagro
• Evolution of the cosmic ray anisotropy above 10^{14} eV
• The puzzling MILAGRO hot spots
• TeV gamma-rays and neutrinos from photo-disintegration of nuclei in Cygnus OB2
• Cosmic-ray composition and its relation to shock acceleration by supernova remnants
• Constraints on the TeV source population and its contribution to the galactic diffuse TeV emission
• Moon Shadow by Cosmic Rays under the Influence of Geomagnetic Field and Search for Antiprotons at Multi-TeV Energies
• Neutrinos from Cosmic Ray Accelerators in the Cygnus Region of the Galaxy
• Estimating a cosmic ray detector exposure sky map under the hypothesis of seasonal and diurnal effects factorization
• Techniques to study cosmic ray anisotropies