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Pitch angle and energy diffusion coefficients from resonant interactions with ion–cyclotron and whistler waves

Published online by Cambridge University Press:  13 March 2009

Lawrence R. Lyons
Lawrence R. Lyons
Affiliation:
Space Environment Laboratory, National Oceanic and Atmospheric Administration, Boulder, Colorado 80302
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Abstract

General relations for quasi-linear diffusion coefficients in pitch angle and energy are applied to resonant particle interactions with ion–cyclotron and whistler waves. Expressions for the diffusion coefficients, valid for any distribution of wave energy with frequency and wave normal angle, are derived and normalized to be independent of the ambient magnetic field intensity and the electron density. The results illustrate how resonant particle diffusion rates vary with pitch angle and energy, and how the diffusion rates depend upon the distribution of wave energy.

Type
Research Article
Information
Journal of Plasma Physics , Volume 12 , Issue 3 , December 1974 , pp. 417 - 432
Copyright
Copyright © Cambridge University Press 1974

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References

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