Formation and initial phase of CME motion associated with prominence eruption and nature of their related shock waves
Using data from SDO, PROBA2 and other spacecrafts, Fainshtein, Egorov (2013) have discovered processes accompanying formation of six limb CMEs and studied regularities of their motion during the initial phase. The considered CMEs occurred after the prominence eruption or hot emission loop, and all of them were associated with X-ray flares. The follow-up study of the CMEs associated with the prominence eruption showed that the formation of such mass ejections and the initial phase of their motion may be characterized by special features. In this work, we give examples of CMEs with such features. We have revealed a positive correlation between the height of the CME-associated eruptive prominence and height of the frontal structure of CMEs measured before they began to move. Analyzing two of the CMEs, using SDO data, we found out that kinematics of the CME body and its related shock wave differs considerably. We have established that the time dependence of shock wave position and velocity obtained from SDO data is in agreement with theoretical dependences of time variation of these motion parameters in the context of self-similar motion of an explosion shock wave. We have concluded that the shock waves are not piston-like ones with the CME body acting as a piston.
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