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The peculiarities of diffusion of the galactic cosmic rays at low energies

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Abstract

I give an interpretation of a result of Simpsonet al. (1988) on the variation with kinetic energyT i of the mean pathlengthX m (T i ) of the galactic cosmic rays (CGRs) in the range 0.1≲T i ≲10.0 GeV nucl−1. I argue that the data onX m (T i ) may be interpreted in terms of a model of GCR diffusion on the one-dimensional Alfvén-wave turbulence, having a cutoff in the spectrum at frequencies σ≲σ h , where σ h is the proton gyrofrequency. The cutoff results in changing of the character of variation of the GCR diffusion coefficientD(T i )∼T a in the rangeT i ≫1 GeV nucl−1 towards some more complicated variation at 0.1≲T i ≲1.0 GeV nucl−1 due to the peculiarities of the pitch-angle scattering at θ≈900.

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  1. A.F. Ioffe Physical Technical Institute, Leningrad, USSR

    V. N. Fedorenko

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  1. V. N. Fedorenko
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Fedorenko, V.N. The peculiarities of diffusion of the galactic cosmic rays at low energies. Astrophys Space Sci 163, 187–200 (1990). https://doi.org/10.1007/BF00655739

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  • DOI: https://doi.org/10.1007/BF00655739

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