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Return currents in solar flares - Collisionless effectsIf the primary, precipitating electrons in a solar flare are unstable to beam plasma interactions, it is shown that strong Langmuir turbulence can seriously modify the way in which a return current is carried by the background plasma. In particular, the return (or reverse) current will not be carried by the bulk of the electrons, but by a small number of high velocity electrons. For beam/plasma densities greater than 0.01, this can reduce the effects of collisions on the return current. For higher density beams where the return current could be unstable to current driven instabilities, the effects of strong turbulence anomalous resistivity is shown to prevent the appearance of such instabilities. Again in this regime, how the return current is carried is determined by the beam generated strong turbulence.
Document ID
19850043879
Document Type
Reprint (Version printed in journal)
Authors
Rowland, H. L. (Maryland Univ. College Park, MD, United States)
Vlahos, L. (Maryland, University College Park, MD, United States)
Date Acquired
August 12, 2013
Publication Date
January 1, 1985
Publication Information
Publication: Astronomy and Astrophysics
Volume: 142
Issue: 2 Ja
ISSN: 0004-6361
Subject Category
SOLAR PHYSICS
Funding Number(s)
CONTRACT_GRANT: NAGW-91
CONTRACT_GRANT: NSF ATM-81-17093
Distribution Limits
Public
Copyright
Other