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Effects of Coulomb collisions on cyclotron maser and plasma wave growth in magnetic loopsThe evolution of nonthermal electrons accelerated in magnetic loops is determined by solving the kinetic equation, including magnetic field convergence and Coulomb collisions in order to determine the effects of these interactions on the induced cyclotron maser and plasma wave growth. It is found that the growth rates are larger and the possibility of cyclotron maser action is stronger for smaller loop column density, for larger magnetic field convergence, for a more isotropic injected electron pitch angle distribution, and for more impulsive acceleration. For modest values of the column density in the coronal portion of a flaring loop, the growth rates of instabilities are significantly reduced, and the reduction is much larger for the cyclotron modes than for the plasma wave modes. The rapid decrease in the growth rates with increasing loop column density suggests that, in flare loops when such phenomena occur, the densities are lower than commonly accepted.
Document ID
19910033888
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Hamilton, Russell J.
(Stanford Univ. Palo Alto, CA, United States)
Petrosian, Vahe
(Stanford University CA, United States)
Date Acquired
August 15, 2013
Publication Date
December 20, 1990
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 365
ISSN: 0004-637X
Subject Category
Plasma Physics
Accession Number
91A18511
Funding Number(s)
CONTRACT_GRANT: NSF ATM-87-05084
CONTRACT_GRANT: NSG-7092
Distribution Limits
Public
Copyright
Other

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