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OSO-8 observations of the impulsive phase of solar flares in the transition-zone and coronaSeveral solar flares were observed from their onset in C IV 1548.2 A and 1-8 A X-rays using instruments on OSO-8. It is found that impulsive brightening in C IV is often accompanied by redshifts, interpreted as downflows, of the order of 80 km/s. The maximum soft X-ray intensity usually arrives several minutes after the maximum C IV intensity. The most energetic C IV event observed shows a small blueshift just before reaching maximum intensity; estimates of the mass flux associated with this upflow through the transition zone are consistent with the increase of mass in the coronal loops as observed in soft X-rays. Finally, it is suggested that the frequent occurrence of violent dynamical processes at the onset of the flare is associated with the initial energy release mechanism.
Document ID
19810043111
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Lites, B. W. (Colorado, University Boulder, Colo., United States)
Bruner, E. C., Jr. (Colorado Univ. Boulder, CO, United States)
Wolfson, C. J. (Lockheed Research Laboratories Palo Alto, Calif., United States)
Date Acquired
August 11, 2013
Publication Date
February 1, 1981
Publication Information
Publication: Solar Physics
Volume: 69
Subject Category
SOLAR PHYSICS
Funding Number(s)
CONTRACT_GRANT: NAS5-22411
CONTRACT_GRANT: NAS5-11363
Distribution Limits
Public
Copyright
Other