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Title:
Cosmic-ray pitch-angle scattering in isotropic turbulence
Authors:
Bieber, John W.; Smith, Charles W.; Matthaeus, William H.
Affiliation:
AA(Delaware, University, Newark), AB(Delaware, University, Newark), AC(Delaware, University, Newark)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 334, Nov. 1, 1988, p. 470-475. (ApJ Homepage)
Publication Date:
11/1988
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Cosmic Rays, Isotropic Turbulence, Magnetohydrodynamics, Turbulence Models, Energy Spectra, Fokker-Planck Equation, Larmor Radius, Pitch (Inclination), Scattering
DOI:
10.1086/166851
Bibliographic Code:
1988ApJ...334..470B

Abstract

The divergent conclusions emerging from previous investigations of cosmic-ray pitch-angle scattering in isotropic magnetic turbulence can be reconciled by incorporating a dissipation range in the turbulence model. Utilizing an isotropic turbulence model that includes dissipation, the authors calculate the Fokker-Planck coefficient for pitch-angle scattering and find that the "slab" form of Fokker-Planck coefficient favored by Jokipii is valid at very low energies, while the nonslab form obtained by Fisk and coworkers applies at intermediate energies.

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Physics
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