On the initiation of Coronal Mass Ejections observed by STEREO/EUVI

P. Syntelis, K. Tsinganos, A. Vourlidas, C. Gontikakis

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This study examines different stages of a Coronal Mass Ejection's (CME) initiation in NOAA Active Region (AR) 10980, observed on January 2, 2008 by STEREO's Extreme UltraViolet Imager (EUVI). We identify a first phase consisting of an upward motion, which at 1.58R? reaches the velocity of 70 (4) km/s. Those measurements are extrapolated to later time frames to examine whether this initial acceleration drives the CME's propagation later on. We also identify an ascending new flux-rope beneath the CME. During the CME's rise, there are indications that some adjacent loops incline to the main CME body. At the later phase of the initiation, some moving blob-like structures appear along the CME flanks. Propagation speeds of these blobs are measured. These blobs could be indications that a siphon flow exists along the CME.


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