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An explanation of the abnormal features of the 1981 april 27 event

Authors
Journal
Chinese Astronomy and Astrophysics
0275-1062
Publisher
Elsevier
Publication Date
Volume
8
Issue
1
Identifiers
DOI: 10.1016/0275-1062(84)90015-8

Abstract

Abstract A large limb burst occured on 1981 April 27, 0720 UT. A large eruptive loop prominence was observed by us at 0816–0951. At 0829.5 and 0833 the loop showed an abnormal flat top, and simultaneously, radio emission at 3.2 cm showed an abnormal absorption. To explain these features, we supposed that a dense cloud moved in front of the top of the H α loop. We showed that if the cloud has a thickness of 10 4km and if it has an electron density 10−9 times that in the active region, then the abnormal absorption at 3.2 cm can be explained by collisional damping.

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