engleski

Acceleration phase of coronal mass ejections: II. Synchronization of the energy release in the associated flare

We analyze the relationship between the acceleration of coronal mass ejections (CMEs) and the energy release in associated flares, employing a sample of 22 events in which the CME kinematics was measured from the pre-eruption stage, up to the post-acceleration phase. The data show a distinct correlation between the duration of the acceleration phase and the duration of the associated soft Xray (SXR) burst rise. The upper limit to the CME peak acceleration and velocity is related to the SXR peak flux. In the majority of events the acceleration started earlier than the SXR burst, and it is usually prolonged after the SXR burst maximum. In about one half of events the acceleration phase is very closely synchronized with the fastest growth of the SXR burst. An additional one quarter of the events may be still considered as relatively-well synchronized, whereas in the remaining quarter of the events there is a considerable mismatch. The results are interpreted in terms of the feed-back relationship between the CME dynamics and the reconnection process in the wake of the CME.

coronal mass ejections; flares; reconnection

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