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High spectral resolution measurements of a solar flare hard X-ray burstObservations are reported of an intense solar flare hard X-ray burst on June 27, 1980, made with a balloon-borne array of liquid nitrogen-cooled Ge detector which provided unprecedented spectral resolution (no more than 1 keV FWHM). The hard X-ray spectra throughout the impulsive phase burst fitted well to a double power-law form, and emission from an isothermal 0.1-1 billion K plasma can be specifically excluded. The temporal variations of the spectrum indicate that the hard X-ray burst is made up of two superposed components: individual spikes lasting about 3-15 sec, which have a hard spectrum and a break energy of 30-65 keV; and a slowly varying component characterized by a soft spectrum with a constant low-energy slope and a break energy which increases from 25 kev to at least 100 keV through the event. The double power-law shape indicates that DC electric field acceleration, similar to that occurring in the earth's auroral zone, may be the source of the energetic electrons which produce the hard X-ray emission.
Document ID
19870042274
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Lin, R. P.
(California, University Berkeley, United States)
Schwartz, R. A.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 13, 2013
Publication Date
January 1, 1987
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 312
ISSN: 0004-637X
Subject Category
Solar Physics
Accession Number
87A29548
Funding Number(s)
CONTRACT_GRANT: NAGW-516
CONTRACT_GRANT: NGL-05-005-003
CONTRACT_GRANT: NSF ATM-84-02231
CONTRACT_GRANT: NGL-05-003-017
CONTRACT_GRANT: NAGW-449
Distribution Limits
Public
Copyright
Other

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