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Comparison of hard X-ray spectra obtained by spectrometers on Hinotori and SMM and detection of 'superhot' componentHard X-ray spectra in solar flares obtained by the broadband spectrometers aboard Hinotori and SMM are compared. Within the uncertainty brought about by assuming the typical energy of the background X-rays, spectra by the Hinotori spectrometer are usually consistent with those by the SMM spectrometer for flares in 1981. On the contrary, flares in 1982 persistently show 20-50-percent higher flux by Hinotori than by SMM. If this discrepancy is entirely attributable to errors in the calibration of energy ranges, the errors would be about 10 percent. Despite such a discrepancy in absolute flux, in the the decay phase of one flare, spectra revealed a hard X-ray component (probably a 'superhot' component) that could be explained neither by emission from a plasma at about 2 x 10 to the 7th K nor by a nonthermal power-law component. Imaging observations during this period show hard X-ray emission nearly cospatial with soft X-ray emission, in contrast with earlier times at which hard and soft X-rays come from different places.
Document ID
19890046545
Document Type
Reprint (Version printed in journal)
Authors
Nitta, Nariaki (Maryland, University College Park, United States)
Date Acquired
August 14, 2013
Publication Date
January 1, 1988
Publication Information
Publication: Advances in Space Research
Volume: 8
Issue: 11 1
ISSN: 0273-1177
Subject Category
SOLAR PHYSICS
Funding Number(s)
CONTRACT_GRANT: NAG5-969
CONTRACT_GRANT: NSF ATM-87-17157
CONTRACT_GRANT: NGR-21-002-199
Distribution Limits
Public
Copyright
Other