The Early Life Of A Coronal Mass Ejection From SECCHI And SOHO Observations

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One of the key advantages of STEREO/SECCHI is the inner coronagraph (COR1), which can observe CMEs in the coronal region where CMEs attain their maximum acceleration. The first CME observed by COR1 was on 2006 December 30. The CME was also observed by the C2 and C3 coronagraphs of SOHO. We compare the morphological and height-time histories between COR1 and SOHO/LASCO data. We find that the flux rope structure evolves significantly between the COR1 and LASCO/C2 FOVs, although we can track features to get a continuous height-time history of the CME. We find excellent agreement between the two sets of data which could be combined to obtain the kinematic properties of the CME. We also superposed a STEREO/COR1 image of the CME on a STEREO/EUVI image and SOHO/C2 image to compare the solar origin and morphology. The CME originated from the southwest quadrant of the Sun and was of flux-rope type moving with an average speed of 200 km/s and an acceleration of 6 m/s/s, with a characteristic two-ribbon structure and an extended post-eruption arcade. In addition to the similarity in CME features, there was excellent correspondence between the outlying streamers in the two coronagraph images.

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