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Linear analysis of ion cyclotron interaction in a multicomponent plasmaThe mechanism by which hot anisotropic protons generate electromagnetic ion cyclotron waves in a plasma containing cold H(+) and He(+) ions is quantitatively studied. Linear growth rates (both temporal and spatial) are computed for different plasma parameters: concentration, temperature,and anisotropy of cold He(+) ions and of hot protons. It is shown that: (1) for parameters typical of the geostationary altitude the maximum growth rates are not drastically changed when a small proportion (about 1 to 20 percent) of cold He(+) ions is present; (2) because of the important cyclotron absorption by thermal He(+) ions in the vicinity of the He(+) gyrofrequency, waves which could resonate with the bulk of the He(+) distribution cannot be generated. Therefore quasi-linear effects, in a homogeneous medium at least, cannot be responsible for the heating of He(+) ions which is often observed in conjunction with ion cyclotron waves. The variation of growth rate versus wave number is also studied for its importance in selecting suitable parameters in numerical simulation experiments.
Document ID
19850029408
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Gendrin, R.
(CNRS and CNET, Centre de Recherches en Physique de l'Environnement Terrestre et Planetaire, Issy-les-Moulineaux, Hauts-de-Seine, France; California, University Los Angeles, CA, United States)
Ashour-Abdalla, M.
(California, University Los Angeles, CA, United States)
Omura, Y.
(Kyoto University Uji, Japan; California University, Los Angeles, CA, United States)
Quest, K.
(Los Alamos National Laboratory, Los Alamos, NM; California, University Los Angeles, CA, United States)
Date Acquired
August 12, 2013
Publication Date
October 1, 1984
Publication Information
Publication: Journal of Geophysical Research
Volume: 89
ISSN: 0148-0227
Subject Category
Geophysics
Accession Number
85A11559
Funding Number(s)
CONTRACT_GRANT: F19628-82-K-0019
CONTRACT_GRANT: NAGW-78
Distribution Limits
Public
Copyright
Other

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