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New observational facts about particle acceleration and transport during solar flaresExtensive hard X-ray (HXR)/gamma-ray (GR) observations of solar flares, performed during solar cycles 21 and 22 have led to important new discoveries. These data, combined with observations obtained in other parts of the electromagnetic spectrum (soft X-ray, Hard X-ray, optical, and radio) largley contributed to get a better understanding and to develop new ideas on particle acceleration and transport during solar flares. This review presents new observational facts relevant to hard X-ray/gamma-ray producing flares. Among these are the frequent presence of sub-second time structure in the hard X-ray emission, the variability in hard X-ray and radio spatial distributions during a flare and from flare to flare, the evidence for strong gamma-ray line emission from the Corona and the existence of extended phases of the gamma-ray emission lasting for several hours after the flare onset. This ensemble of observations indicates that particle acceleration takes place at different sites in a complex and dynamic magnetic field environment.
Document ID
19950064132
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Trottel, G.
(Observatoire de Paris Meudon, France)
Date Acquired
August 17, 2013
Publication Date
January 1, 1996
Publication Information
Publication: Advances in Space Research
Volume: 17
Issue: 5-Apr
ISSN: 0273-1177
Subject Category
Solar Physics
Accession Number
95A95731
Funding Number(s)
CONTRACT_GRANT: NAS5-32484
Distribution Limits
Public
Copyright
Other

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