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The Fokker-Planck coefficient for pitch-angle scattering of cosmic rays

Author
Goldstein, M. L.
Published
Oct 1, 1973.
Physical Description
1 electronic document
Additional Creators
Fisk, L. A., Sandri, G., and Klimas, A. J.
Online Version

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Unclassified, Unlimited, Publicly available.
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Summary
For the case of homogeneous, isotropic magnetic field fluctuations, it is shown that most theories which are based on the quasi-linear and adiabatic approximation yield the same integral for the Fokker-Planck coefficient for the pitch angle scattering of cosmic rays. For example, despite apparent differences, the theories due to Jokipii and to Klimas and Sandri yield the same integral. It is also shown, however, that this integral in most cases has been evaluated incorrectly in the past. For large pitch angles these errors become significant, and for pitch angles of 90 deg the actual Fokker-Planck coefficient contains a delta function. The implications for these corrections relating cosmic ray diffusion coefficients to observed properties of the interplanetary magnetic field are discussed.
Other Subject(s)
Collection
NASA Technical Reports Server (NTRS) Collection.
Note
Document ID: 19740005421.
Accession ID: 74N13534.
NASA-TM-X-70527.
X-660-73-320.
Terms of Use and Reproduction
No Copyright.
View MARC record | catkey: 15746448