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Non-thermal processes during the 'build-up' phase of solar flares and in absence of flaresHard X-ray and radio observations indicate production of non-thermal electrons as a common phenomenon of the active sun. A preliminary analysis of three hard X-ray bursts observed with the OGO-5 satellite and radio observations indicate that non-thermal particles are present in the flare region prior to the impulsive (flash) phase and also during the gradual rise and fall (GRF) bursts which are usually explained in terms of purely 'thermal' radiation. The principal difference between the non-thermal electrons observed before the flash phase and during the flash phase appears to be in their total number rather than in the hardness of their energy spectrum. Basic characteristics of the two acceleration processes are probably similar although the total energy converted into non-thermal electrons is considerably larger in the flash phase. Transient absorbing H-alpha features and filament activations are discussed in terms of their ability to produce energetic particle events and magnetic energy release.
Document ID
19770035720
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Kane, S. R.
(California, University Berkeley, Calif., United States)
Pick, M.
(Paris, Observatoire, Meudon Hauts-de-Seine, France)
Date Acquired
August 9, 2013
Publication Date
March 1, 1976
Subject Category
Solar Physics
Accession Number
77A18572
Funding Number(s)
CONTRACT_GRANT: NSG-7092
CONTRACT_GRANT: N00014-67-A-0112-0068
CONTRACT_GRANT: NGL-05-003-017
Distribution Limits
Public
Copyright
Other

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