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- W2963235549 abstract "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 discovered a sharp (∼ 10◦) arrival anisotropy of CR nuclei. We suggest a mechanism for producing a weak and narrow CR beam which operates en route to the observer. The key assumption is that CRs are scattered by a strongly anisotropic Alfven wave spectrum formed by the turbulent cascade across the local field direction. The strongest pitch-angle scattering occurs for particles moving almost precisely along the field line. Partly because this direction is also the direction of minimum of the large scale CR angular distribution, the enhanced scattering results in a weak but narrow particle excess. The width, the fractional excess and the maximum momentum of the beam are calculated from a systematic transport theory depending on a single scale l which can be associated with the longest Alfven wave, efficiently scattering the beam. The best match to all the three characteristics ar X iv :1 00 5. 13 12 v2 [ as tr oph .G A ] 2 8 Ju l 2 01 0" @default.
- W2963235549 created "2019-07-30" @default.
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- W2963235549 date "2011-05-01" @default.
- W2963235549 modified "2023-09-27" @default.
- W2963235549 title "Probing Nearby CR Accelerators and ISM Turbulence with Milagro Hot Spots" @default.
- W2963235549 hasPublicationYear "2011" @default.
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