Galactic magnetic fields and the large-scale anisotropy at MILAGRO
arXiv:0907.2889 · doi:10.1088/0004-637X/703/1/L90
Abstract
The air-shower observatory Milagro has detected a large-scale anisotropy of unknown origin in the flux of TeV cosmic rays. We propose that this anisotropy is caused by galactic magnetic fields, in particular, that it results from the combined effects of the regular and the turbulent (fluctuating) magnetic fields in our vicinity. Instead of a diffusion equation, we integrate Boltzmann's equation to show that the turbulence may define a preferred direction in the cosmic-ray propagation that is orthogonal to the local regular magnetic field. The approximate dipole anisotropy that we obtain explains well Milagro's data.
12 pages, version to appear in ApJL
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- Observation of an Anisotropy in the Galactic Cosmic Ray arrival direction at 400 TeV with IceCube
- Local Magnetic Turbulence and TeV-PeV Cosmic Ray Anisotropies
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- Origin of Cosmic Rays
- Magnetic reconnection as the cause of cosmic ray excess from the heliospheric tail
- Anisotropy of TeV Cosmic Rays and the Outer Heliospheric Boundaries
- The local Galactic magnetic field in the direction of Geminga
- Constraining the regular Galactic Magnetic Field with the 5-year WMAP polarization measurements at 22 GHz
- Magnetic fields and cosmic ray anisotropies at TeV energies
- Dark matter electron anisotropy: a universal upper limit
- Cosmic Rays and Stochastic Magnetic Reconnection in the Heliotail
- Cosmic Magnetic Lenses
- Observation of CR Anisotropy with ARGO-YBJ
- A Search for Small-Scale Anisotropy of PeV Cosmic Rays