Mirroring in the Fokker-Planck coefficient for cosmic-ray pitch-angle scattering in homogeneous magnetic turbulence

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https://ui.adsabs.harvard.edu/abs/1975ApJ...195..787G/abstract

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UMBC Goddard Planetary Heliophysics Institute (GPHI)

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https://orcid.org/0000-0002-5317-988X

Date

1975-02

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journal articles
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Citation of Original Publication

Goldstein, M. L., A. J. Klimas, and G. Sandri. “Mirroring in the Fokker-Planck Coefficient for Cosmic-Ray Pitch-Angle Scattering in Homogeneous Magnetic Turbulence.” The Astrophysical Journal 195 (February 1, 1975): 787–99. https://doi.org/10.1086/153383.

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This work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.
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Abstract

The Fokker-Planck coefficient for pitch-angle scattering, appropriate for cosmic rays in homogeneous stationary magnetic turbulence is computed without making any specific assumptions concerning the statistical symmetries of the random field. The Fokker-Planck coefficient obtained can be used to compute the parallel diffusion coefficient for high-energy cosmic rays propagating in the presence of strong turbulence, or for low-energy cosmic rays in the presence of weak turbulence. Because of the generality of magnetic turbulence allowed for in the analysis, special interplanetary magnetic field features, such as discontinuities or particular wave modes, can be included rigorously.