Coronal mass ejections acceleration problem

Details Coronal mass ejections acceleration problem Coronal mass ejections acceleration problem

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008adspr..42..852w&link_type=abstract

Advances in Space Research, Volume 42, Issue 5, p. 852-857.

Physics

1

Scientific paper

A statistical study of acceleration and its error of coronal mass ejections (CMEs) observed by the Large Angle Spectrometric Coronagraph (LASCO) is performed. A total of 5594 CMEs events have been analyzed by using a least-square method and using the error in the height measures. We verify that slower CMEs (velocities in the interval from 200 to 500 km s-1) tend to have a positive acceleration (about 1 m s-2) at heights above 5 solar radii, while less than 10% CMEs show an average negative acceleration (about -2.2 m s-2) as they propagate from 5 to 30 solar radii. For most individual CMEs one can not say if they are accelerated or decelerated, only for 8% of all observed CMEs events one can extract the sign of the acceleration in the 5 30 solar radii.

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