Observations of Transient Activity in the Low Corona by EIT Prior to and During the Launch of CME's

Werner M. Neupert

Abstract

Extreme Ultraviolet (EUV) observatons of the Sun taken by the EUV Imaging Telescope (EIT) on SOHO have been used to search for transient activity in the low corona prior to and during the launch of coronal mass ejections. In one particular example studied, apparently not initiated by a prominence eruption or flare, the morphology of an outgoing loop eventually observed by LASCO is already observed near the base of the corona where it accelerates from several tens of km per sec to several hundred km per sec. This acceleration begins well before an associated GOES soft X-ray burst. Disappearing or reconfiguring coronal loop systems, suggesting possible magnetic reconnection sites, have been identified in several events.

Raytheon STX Corporation
Lanham, MD

Present Address:

Space Environment Center, NOAA
325 Broadway
Boulder, CO 80303