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Spatial and temporal structures of impulsive bursts from solar flares observed in UV and hard X-raysNew observations are presented of impulsive UV and hard X-rays bursts in two solar flares obtained with instruments on Solar Maximum Mission. The UV bursts were observed in the Si IV and O IV emission lines, whose intensity ratio is density-sensitive. By comparing the spatially resolved Si IV/O IV observations with the corresponding hard X-ray observations, it is possible to study their spatial and temporal relationships. For one flare, the individual component spikes in the multiply peaked hard X-ray burst can be identified with different discrete Si IV/O IV flaring kernels of size 4 arcsec x 4 arcsec or smaller, which brighten up sequentially in time. For the other, many Si IV/O kernels, widely distributed over a large area, show impulsive bursts at the same time, which correlate with the main peak of the impulsive hard X-ray burst. The density of the flaring Si IV/O IV kernels is in the range from 5 x 10 to the 12th-13th/cu cm.
Document ID
19810061772
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Cheng, C.-C. (NASA Marshall Space Flight Center Huntsville, AL, United States)
Tandberg-Hanssen, E. (NASA Marshall Space Flight Center Huntsville, AL, United States)
Bruner, E. C. (Lockheed Research Laboratories Palo Alto, CA, United States)
Orwig, L. (NASA Marshall Space Flight Center Huntsville, AL, United States)
Frost, K. J. (NASA Marshall Space Flight Center Huntsville, AL, United States)
Kenny, P. J. (NASA Marshall Space Flight Center Huntsville, AL, United States)
Woodgate, B. E. (NASA Marshall Space Flight Center Huntsville, AL, United States)
Shine, R. A. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 11, 2013
Publication Date
August 15, 1981
Publication Information
Publication: Astrophysical Journal
Subject Category
SOLAR PHYSICS
Distribution Limits
Public
Copyright
Other