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Differences of observed characteristics between impulsive bursts and post-burst increases

✍ Scribed by Keizo Kai; Takeo Kosugi; Hiroshi Nakajima

Publisher
Springer
Year
1982
Tongue
English
Weight
520 KB
Volume
75
Category
Article
ISSN
0038-0938

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✦ Synopsis

The change of source characteristics during the transition from the impulsive phase to the post-burst phase is investigated for cm bursts on a statistical basis. The results are the following:

(1) The sudden decrease of the circular polarization degree is found almost invariably at the transition; typically from 20-30% down to a few percent. (2) Some bursts show remarkable source expansions in the post-burst phase. There are no cases in which impulsive bursts have larger source size than the associated post-burst increases. (3) Type III bursts which are indicative of non-thermal phenomena are associated with the impulsive phase but not with the post-burst phase. Implications of these observed results are discussed.

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