Statistical Distributions of Speeds of Coronal Mass Ejections

Details Statistical Distributions of Speeds of Coronal Mass Ejections Statistical Distributions of Speeds of Coronal Mass Ejections

Jan 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005apj...619..599y&link_type=abstract

The Astrophysical Journal, Volume 619, Issue 1, pp. 599-603.

Astronomy and Astrophysics

Astronomy

38

Sun: Corona, Sun: Coronal Mass Ejections (Cmes)

Scientific paper

We studied the distribution of plane-of-sky speeds determined for 4315 coronal mass ejections (CMEs) detected by the Large Angle and Spectrometric Coronagraph Experiment on board the Solar and Heliospheric Observatory (SOHO LASCO). We found that the speed distributions for accelerating and decelerating events are nearly identical and to a good approximation they can be fitted with a single lognormal distribution. This finding implies that, statistically, there is no physical distinction between the accelerating and the decelerating events. The lognormal distribution of the CME speeds suggests that the same driving mechanism of a nonlinear nature is acting in both slow and fast dynamical types of CMEs.

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