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Strong Double Layers, Existence Criteria, and Annihilation: An Application to Solar Flares

Published online by Cambridge University Press:  12 April 2016

Martin Volwerk
Affiliation:
Sterrekundig Instituut Utrecht, P.O. Box 80.000, 3508 TA Utrecht, The Netherlands CHEAF, P.O. Box 41882, 1009 DB Amsterdam, The Netherlands
Jan Kuijpers
Affiliation:
Sterrekundig Instituut Utrecht, P.O. Box 80.000, 3508 TA Utrecht, The Netherlands CHEAF, P.O. Box 41882, 1009 DB Amsterdam, The Netherlands Discipline Natuurkunde, K.U.N., Toernooiveld 1, 6525 ED Nijmegen, The Netherlands

Abstract

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We present some conditions for the stability of a strong double layer in a warm, current-carrying plasma, which can be extended into the relativistic regime. We apply a model for plasma heating by the electron beam emitted from the double layer and show that this leads to a finite life time of the double layer. We also show that the radio emission accompanying this process can well describe the observed phenomena in Type I radio bursts using a direct emission mechanism, not involving Langmuir waves.

Subject headings: plasmas — Sun: flares — Sun: radio radiation

Type
Interplanetary Medium
Copyright
Copyright © The American Astronomical Society 1994

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