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Stochastic gyroresonant electron acceleration on a low-beta plasma. II - Implications of thermal effects in a solar flare plasmaWe consider the thermal damping of R and L waves under typical solar flare conditions. We find that the thermal particles cause rapid dissipation of the cyclotron waves, but do not affect whistlers and Alfven waves. The dissipation of electron cyclotron waves in particular leads to a threshold energy for acceleration which is about 10 times the thermal energy. Therefore, in the absence of an instability that excites these HF waves, a second mechanism is required in order to inject a sufficient number of electrons above the threshold energy and account for solar flare gamma-ray bremsstrahlung emission. We also find that the comoving gyroresonance, which occurs when the electron is in gyroresonance with an R wave whose group velocity equals the parallel electron velocity, can be realized by relativistic electrons if the plasma temperature is less than or approximately equal to 5,000,000 K.
Document ID
19930030021
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Miller, James A.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Steinacker, Juergen
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 15, 2013
Publication Date
November 1, 1992
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 399
Issue: 1
ISSN: 0004-637X
Subject Category
Solar Physics
Accession Number
93A14018
Funding Number(s)
PROJECT: RTOP 665-170-38-53-09
PROJECT: RTOP 665-432-36-00-01
Distribution Limits
Public
Copyright
Other

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