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Stereoscopic observations of a solar flare hard X-ray source in the high coronaThe vertical structure of the impulsive and gradual hard X-ray sources in high coronae and the characteristics of the impulsive soft X-ray emission are investigated on the basis of PVE, ICE, and GOES observations of the energetic flare on February 16, 1984. The average photon spectra observed by these instruments during the impulsive and gradual hard X-ray bursts are summarized. A comparison of these unocculted and partially occulted spectra shows that the sources of the impulsive hard X-ray (greater than about 25 keV) and impulsive soft X-ray (2-5 keV) emissions in this flare extended to coronal altitudes greater than about 200,000 km above the photosphere. At about 100 keV, the ratio of the coronal source brightness to the total source brightness was 0.001 during the impulsive phase and less than about 0.01 during the gradual hard X-ray burst. The sources of the gradual hard X-ray burst and gradual soft X-ray burst were almost completely occulted, indicating that these sources were located at heights less than 200,000 km above the photosphere.
Document ID
19920054165
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Kane, S. R.
(NASA Headquarters Washington, DC United States)
Mctiernan, J.
(NASA Headquarters Washington, DC United States)
Loran, J.
(California, University Berkeley, United States)
Fenimore, E. E.
(NASA Headquarters Washington, DC United States)
Klebesadel, R. W.
(NASA Headquarters Washington, DC United States)
Laros, J. G.
(Los Alamos National Laboratory NM, United States)
Date Acquired
August 15, 2013
Publication Date
May 10, 1992
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 390
Issue: 2 Ma
ISSN: 0004-637X
Subject Category
Solar Physics
Accession Number
92A36789
Funding Number(s)
CONTRACT_GRANT: NASA ORDER A-47981-P
CONTRACT_GRANT: NAGW-2452
CONTRACT_GRANT: NAG5-376
Distribution Limits
Public
Copyright
Other

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