Interplanetary acceleration of coronal mass ejections

Using an observed relation between speeds of CMEs near the Sun and in the solar wind, we determine an “effective” acceleration acting on the CMEs. We found a linear relation between this effective acceleration and the initial speed of the CMEs. The acceleration is similar to that of the slow solar w...

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Bibliographic Details
Published in:Geophysical research letters 2000-01, Vol.27 (2), p.145-148
Main Authors: Gopalswamy, N., Lara, A., Lepping, R. P., Kaiser, M. L., Berdichevsky, D., St. Cyr, O. C.
Format: Article
Language:English
Subjects:
Astronomy
Coronal mass ejection
Earth, ocean, space
Exact sciences and technology
Solar physics
Solar system
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Summary:Using an observed relation between speeds of CMEs near the Sun and in the solar wind, we determine an “effective” acceleration acting on the CMEs. We found a linear relation between this effective acceleration and the initial speed of the CMEs. The acceleration is similar to that of the slow solar wind in magnitude. The average solar wind speed naturally divides CMEs into fast and slow ones. Based on the relation between the acceleration and initial speed, we derive an empirical model to predict the arrival of CMEs at 1 AU.
ISSN:0094-8276
1944-8007
DOI:10.1029/1999GL003639