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Impulsive and gradual hard X-ray sources in a solar flareThe paper reports recent observations of a relatively large hard X-ray burst with well developed impulsive and gradual components, that was associated with a relatively modest optical flare on Aug. 14, 1979. The impulsive X-ray source has a much higher ion density and the electron injection in the phase is shorter in duration consisting of fewer energetic electrons than in the gradual phase. The gradual X-ray source seems to consist of a lower density region, probably bounded by a magnetic arch in which the energetic electrons are perfectly trapped. The different temporal development of the impulsive and gradual hard X-ray components suggest large differences in the physical parameters of the ambient plasma.
Document ID
19820049682
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Vilmer, N.
(Observatoire de Paris-Meudon France)
Trotter, G.
(Paris, Observatoire, Meudon Hauts-de-Seine, France)
Kane, S. R.
(California, University Berkeley, CA, United States)
Date Acquired
August 10, 2013
Publication Date
April 1, 1982
Publication Information
Publication: Astronomy and Astrophysics
Volume: 108
Issue: 2, Ap
Subject Category
Solar Physics
Accession Number
82A33217
Funding Number(s)
CONTRACT_GRANT: NAS5-25980
CONTRACT_GRANT: F19628-80-C-0208
Distribution Limits
Public
Copyright
Other

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