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Electron precipitation in solar flares - Collisionless effectsA large fraction of the electrons which are accelerated during the impulsive phase of solar flares stream towards the chromosphere and are unstable to the growth of plasma waves. The linear and nonlinear evolution of plasma waves as a function of time is analyzed with a set of rate equations that follows, in time, the nonlinearly coupled system of plasma waves-ion fluctuations. As an outcome of the fast transfer of wave energy from the beam to the ambient plasma, nonthermal electron tails are formed which can stabilize the anomalous Doppler resonance instability responsible for the pitch angle scattering of the beam electrons. The non-collisional losses of the precipitating electrons are estimated, and the observational implication of these results are discussed.
Document ID
19850031903
Document Type
Reprint (Version printed in journal)
Authors
Vlahos, L. (Maryland Univ. College Park, MD, United States)
Rowland, H. L. (Maryland, University College Park, MD, United States)
Date Acquired
August 12, 2013
Publication Date
October 1, 1984
Publication Information
Publication: Astronomy and Astrophysics
Volume: 139
Issue: 2 c
ISSN: 0004-6361
Subject Category
SOLAR PHYSICS
Funding Number(s)
CONTRACT_GRANT: NAGW-81
CONTRACT_GRANT: NSF ATM-81-17093
Distribution Limits
Public
Copyright
Other