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Particle propagation, wave growth and energy dissipation in a flaring flux tubeWave amplification by downgoing particles in a common flare model is investigated. The flare is assumed to occur at the top of a coronal magnetic flux loop, and results in the heating of plasma in the flaring region. The hot electrons propagate down the legs of the flux tube towards increasing magnetic field. It is simple to demonstrate that the velocity distributions which result in this model are unstable to both beam instabilities and cyclotron maser action. An explanation is presented for the propagation effects on the distribution, and the properties of the resulting amplified waves are explored, concentrating on cyclotron maser action, which has properties (emission in the z mode below the local gyrofrequency) quite different from maser action by other distributions considered in the context of solar flares. The z mode waves will be damped in the coronal plasma surrounding the flaring flux tube and lead to heating there. This process may be important in the overall energy budget of the flare. The downgoing maser is compared with the loss cone maser, which is more likely to produce observable bursts.
Document ID
Document Type
Reprint (Version printed in journal)
White, S. M.
(Maryland, University College Park, United States)
Melrose, D. B.
(Sydney, University Australia)
Dulk, G. A.
(Colorado, University Boulder, United States)
Date Acquired
August 13, 2013
Publication Date
January 1, 1986
Publication Information
Publication: Advances in Space Research
Volume: 6
Issue: 6 19
ISSN: 0273-1177
Subject Category
Solar Physics
Accession Number
Funding Number(s)
Distribution Limits

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