Expansion Speed of Coronal Mass Ejections

被引：0
|
作者：
G. Michalek
N. Gopalswamy
S. Yashiro
机构：
[1] Astronomical Observatory of Jagiellonian University,Solar Physics Laboratory
[2] NASA GSFC,Center for Solar and Space Weather
[3] Catholic University of America,undefined
来源：
Solar Physics | 2009年 / 260卷
关键词：
Sun: solar activity; Sun: coronal mass ejections;
D O I：
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学科分类号：
摘要：
A large set of limb coronal mass ejections (CMEs) are used to determine the accurate relationship between radial (Vrad) and expansion (Vexp) speeds of CMEs. It is demonstrated that this relation is exceptionally well described by the function f(w)=1/2(1+cot w), representing a full cone model for the CME with a half-width, w. We also demonstrate that for extremely fast CMEs (Vexp>3000 km s−1), it is better to use the approximation Vrad≈VLE. This implies that such CMEs expand spherically above the solar surface.
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页码：401 / 406
页数：5
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