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Electromagnetic cyclotron-loss-cone instability associated with weakly relativistic electronsThe amplification of fast extraordinary mode waves at frequencies very close to the electron cyclotron frequency, due to the presence of a population of energetic electrons with a loss-cone type distribution, is studied. Low-energy background electrons are included in the analysis. Two types of loss-cone distribution functions are considered, and it is found that the maximum growth rates for both distribution functions are of the same order of magnitude. When the thermal effects of the energetic electrons are included in the dispersion equation, the real frequencies of the waves are lower than those obtained by using the cold plasma approximation. This effect tends to enhance the growth rate. An idealized case including a parallel electric field such that the distribution function of the trapped energetic electrons is modified is also considered. It is assumed that the parallel electric field can remove the low-energy background electrons away from the source region of radiation. Both these effects increase the growth rate.
Document ID
19830037701
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Wong, H. K.
(Maryland Univ. College Park, MD, United States)
Wu, C. S.
(Maryland Univ. College Park, MD, United States)
Ke, F. J.
(Maryland, University College Park, MD, United States)
Schneider, R. S.
(Maryland Univ. College Park, MD, United States)
Ziebell, L. F.
(Rio Grande do Sul, Universidade Federal, Porto Alegre, Brazil)
Date Acquired
August 11, 2013
Publication Date
December 1, 1982
Publication Information
Publication: Journal of Plasma Physics
Volume: 28
Subject Category
Plasma Physics
Accession Number
83A18919
Funding Number(s)
CONTRACT_GRANT: NGL-21-002-005
Distribution Limits
Public
Copyright
Other

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