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      Puzzles of the cosmic ray anisotropy

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          Abstract

          We discuss three of the known puzzles of the cosmic ray anisotropy in the PeV and sub-PeV energy region. They are: (1) the so called inverse anisotropy, (2) the irregularity in the energy dependence of the amplitude and phase of the first harmonic and (3) the contribution of the single source.

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          The Anisotropy of Galactic Cosmic Rays as a Product of Stochastic Supernova Explosions

          We study the effect of the stochastic character of supernova explosions on the anisotropy of galactic cosmic rays below the knee. We conclude that if the bulk of cosmic rays are produced in supernova explosions the observed small and nearly energy independent amplitude of the anisotropy and its phase are to the large extent determined by the history of these explosions in the vicinity of the solar system, namely by the location and the age of the supernova remnants, within a few kpc, which give the highest contribution to the total intensity at the present epoch. Among the most important factors which result in the small magnitude and the energy independence of the anisotropy amplitude are the mixed primary mass composition, the effect of the Single Source and the Galactic Halo. Special attention is given to the phase of the anisotropy. It is shown that the excessive flux from the Outer Galaxy can be due to the location of the solar system at the inner edge of the Orion Arm which has the enhanced density and rate of supernova explosions.
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            Author and article information

            Journal
            01 January 2019
            Article
            10.1016/j.asr.2018.09.042
            1901.00160

            http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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            Advances in Space Research 63 (2019) 794-799
            6 pages, 3 figures. arXiv admin note: substantial text overlap with arXiv:1404.5918
            astro-ph.HE

            High energy astrophysical phenomena

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