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Observations of solar X-ray bursts in the energy range 5-15 keVBursts of solar X-rays in the energy range 5-15 keV are associated with flares and are due to thermal emission from a hot coronal plasma. The results of the first study of a large sample of separate bursts, 197 events associated with subflares, and of a few events of importance 1 are presented. The observations were made by a proportional counter on the satellite OSO-7 from October, 1971 to June, 1972. In most cases, the temperature characterizing the X-ray spectrum rises impulsively at the onset of the burst and then declines slowly throughout the remainder of the burst. The emission measure rises exponentially with a time scale of 30-100 sec and then declines slowly on a time scale of the order of 1,000 sec. It is shown that the growth of the thermal energy in the flare plasma throughout the burst can be due to the heating of new cool material.
Document ID
19740048917
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Datlowe, D. W.
Hudson, H. S.
Peterson, L. E.
(California, University La Jolla, Calif., United States)
Date Acquired
August 7, 2013
Publication Date
March 1, 1974
Publication Information
Publication: Solar Physics
Volume: 35
Subject Category
Space Radiation
Accession Number
74A31667
Funding Number(s)
CONTRACT_GRANT: NAS5-11081
Distribution Limits
Public
Copyright
Other

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