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Impulsiveness and energetics in solar flares with and without type II radio bursts - A comparison of hard X-ray characteristics for over 2500 solar flaresThe hard X-ray characteristics of more than 2500 solar flares are used to study the relative size, impulsiveness, and energetics of flares with and without type II radio bursts. A quantitative definition of the hard X-ray impulsiveness is introduced, which may be applied to a large number of events unambiguously. It is found that the flares with type II bursts are generally not significantly larger, more impulsive, or more energetic than those without type II bursts. Also, no evidence is found to suggest a simple classification of the flares as either 'impulsive' or 'gradual'. Because type II bursts are present even in small flares with relatively unimpulsive energy releases, it is concluded that changes in the ambient conditions of the solar atmosphere causing an unusually low Alfven speed may be important in the generation of the shock wave that produces type II radio bursts.
Document ID
19890037422
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Pearson, Douglas H.
(Wisconsin Univ. Eau Claire, WI, United States)
Nelson, Robert
(Wisconsin Univ. Eau Claire, WI, United States)
Kojoian, Gabriel
(Wisconsin Univ. Eau Claire, WI, United States)
Seal, James
(Wisconsin, University Eau Claire, United States)
Date Acquired
August 14, 2013
Publication Date
January 15, 1989
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 336
ISSN: 0004-637X
Subject Category
Solar Physics
Accession Number
89A24793
Funding Number(s)
CONTRACT_GRANT: F49620-82-C-0035
Distribution Limits
Public
Copyright
Other

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