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The expansion of a coronal mass ejection within LASCO field of view: some regularities

Published online by Cambridge University Press:  01 September 2008

V. G. Fainshtein
V. G. Fainshtein*
Affiliation:
Institute of solar-terrestrial physics SB RAS, P.O. Box 291, 664033, Irkutsk, Russia email: vfain@iszf.irk.ru
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Abstract

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Forty five limb CMEs related with eruptive prominences and/or near-to-limb post-eruptive arcades have been tested. It is shown that CMEs can be divided into two groups. The first group includes coronal mass ejections whose “2α” latitude angular sizes apparent in the plane of the sky remain unchanged within measurement accuracy of several degrees. The second one is formed by CMEs that expand “non-radially”, namely, their angular sizes increase by the relative value (10-30)% up to the position of the ejection front RF = Rαm and run to the maximal value 2αm at this distance. It has been found that CMEs of the second type are, on the average, wider, faster and have an outer shell brighter and with higher plasma density for long distances. It is shown that on average Rαm increases as 2αm rises.

Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 4 , Symposium S257: Universal Heliophysical Processes , September 2008 , pp. 257 - 263
Copyright
Copyright © International Astronomical Union 2009

References

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