CMEs observed continuously from the lower corona to the far corona Original Research Article

A campaign of observations with EIT on board SOHO called “CME watch”, is designed to observe the whole sun surface in 195 Å 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.