AbstractA 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 500kms−1) tend to have a positive acceleration (about 1ms−2) at heights above 5 solar radii, while less than 10% CMEs show an average negative acceleration (about −2.2ms−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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    Title :

    Coronal mass ejections acceleration problem


    Contributors:

    Published in:

    Advances in Space Research ; 42 , 5 ; 852-857


    Publication date :

    2007-05-12


    Size :

    6 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




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