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Absorption and emission of extraordinary-mode electromagnetic waves near cyclotron frequency in nonequilibrium plasmasAn investigation is presented of two cases: (1) weakly relativistic electrons with a loss-cone type distribution, and (2) electrons with a drift velocity parallel to the ambient magnetic field. Numerical computations are given for physical parameters close to those in the polar region of the earth magnetosphere and laboratory experiments, with attention to the fast extraordinary-mode radiation whose frequency is near that of the electron cyclotron frequency. The fast extraordinary mode can escape from a strong field region to the weaker field region and may therefore be measured outside the plasma. It is found that the X mode radiation can be amplified by means of a cyclotron maser effect when the electrons have a loss-cone distribution, and it is concluded that, when the electron energy is sufficiently high, the X mode cutoff frequency may be lower than the cyclotron frequency.
Document ID
19820035749
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Wu, C. S.
(Maryland Univ. College Park, MD, United States)
Lin, C. S.
(Maryland Univ. College Park, MD, United States)
Wong, H. K.
(Maryland, University College Park, MD, United States)
Tsai, S. T.
(Maryland Univ. College Park, MD, United States)
Zhou, R. L.
(Chinese Academy of Sciences Physics Institute, Beijing, People's Republic Of China)
Date Acquired
August 10, 2013
Publication Date
December 1, 1981
Publication Information
Publication: Physics of Fluids
Volume: 24
Subject Category
Plasma Physics
Accession Number
82A19284
Funding Number(s)
CONTRACT_GRANT: NGL-21-002-005
Distribution Limits
Public
Copyright
Other

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