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Enhancement of wave growth for warm plasmas with a high-energy tail distributionThe classical linear theory of electromagnetic wave growth in a warm plasma is considered for waves propagating parallel to a uniform ambient magnetic field. Wave-growth rates are calculated for ion-driven right-hand mode waves for Kappa and Maxwellian particle distribution functions and for various values of the spectral index, the temperature anisotropy, and the ratio of plasma pressure to magnetic pressure appropriate to the solar wind. When the anisotropy is low the wave growth is limited to frequencies below the proton gyrofrequency and the growth rate increases dramatically as the spectral index is reduced. The growth rate for any Kappa distribution greatly exceeds that for a Maxwellian with the same bulk properties. For large thermal anisotropy the growth rate from either distribution is greatly enhanced. The growth rates from a Kappa distribution are generally larger than for a Maxwellian distribution, and significant wave growth occurs over a broader range of frequencies.
Document ID
19910036400
Document Type
Reprint (Version printed in journal)
Authors
Thorne, Richard M. (California, University Los Angeles, United States)
Summers, Danny (Newfoundland, Memorial University Saint John's, Canada)
Date Acquired
August 15, 2013
Publication Date
January 1, 1991
Publication Information
Publication: Journal of Geophysical Research
Volume: 96
ISSN: 0148-0227
Subject Category
PLASMA PHYSICS
Funding Number(s)
CONTRACT_GRANT: NAGW-1639
CONTRACT_GRANT: NSF ATM-87-18108
CONTRACT_GRANT: NSERC-A-0621
Distribution Limits
Public
Copyright
Other