CMEs Observed Continuously from the Lower Corona to the Far Corona

TitleCMEs Observed Continuously from the Lower Corona to the Far Corona
Publication TypeJournal Article
Year of Publication2000
AuthorsDelannée, C., DelaboudinièRe J.-P., and Lamy P.
JournalAdvances in Space Research

A campaign of observations with EIT on board SOHO called ``CME watch'', is designed to observe the whole sun surface in 195 A&ring i.e. in a Fe XII emission line, every 17 minutes. In order to analyze the events, we also used He II and coronagraph observations of 97/11/03. By this way, the very beginning of some CMEs was observed. The ejections were seen in Fe XII as a dark bubble propagating in the corona above a prominence, and dimmings produced near an active region and propagating on the solar surface. Two of the ejections coming from the active region were produced with a very short time of delay (1 hour). All the ejections were associated to a CME. However, one CME was not related to a Fe xII low corona event, but maybe this CME had its origin behind the limb. The CME associated with the prominence was quite slow (50 km s$^{-1}$) and the ones associated with the active region were quite fast (114-490 km s$^{-1}$). This analysis permitted a better identification of the different CMEs appearing in the coronagraph field of view