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SYMPATHETIC CORONAL MASS EJECTIONS View all abstracts by submitter

Yong-Jae Moon   Submitted: 2003-04-18 11:46

We address the question whether there exist sympathetic coronal mass ejections (CMEs), which take place almost simultaneously in different locations with a certain physical connection. For this study, the following three investigations are performed. First, we have examined the waiting-time distribution of the CMEs that were observed by {it SOHO}/LASCO from February 1999 to December 2001. The observed waiting time distribution is found to be well approximated by a time-dependent Poisson distribution without any noticeable overabundance at short waiting times. Second, we have investigated the angular difference distribution of successive CME pairs to examine their spatial correlations. A remarkable overabundance relative to background levels is found within 10arcdeg of the position angle difference, which supports the existence of quasi-homologous CMEs that sequentially occur in the same active region. The above results both indicate that sympathetic (interdependent) CMEs are far less frequent than independent CMEs. Third, we have examined the EIT running difference images and the LASCO images of quasi-simultaneous CME pairs, and found a candidate of the sympathetic CME pair, of which the second CME may be initiated by eruption of the first CME. Possible mechanisms of the sympathetic CME triggering are discussed.

Authors: Y.-J. Moon, G. S. Choe, H. Wang, Y. D. Park
Projects: Soho-EIT

Publication Status: ApJ, 2003, May 10 issue
Last Modified: 2003-04-18 11:47
Go to main E-Print page  MAGNETIC HELICITY CHANGES OF SOLAR ACTIVE REGIONS  Hot coronal loop oscillations observed with SUMER: examples and statistics (A full paper)  Edit Entry  Download Preprint  Delete Entry 

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