Multiple CME Events Observed With LASCO

Details Multiple CME Events Observed With LASCO Multiple CME Events Observed With LASCO

May 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999soph..186..363l&link_type=abstract

Solar Physics, v. 186, Issue 1/2, p. 363-379 (1999).

Physics

13

Scientific paper

Observations are reported of two multiple CME events which were detected on 2-3June 1997 and 9-10June 1998, using the LASCO instrument on board SOHO. Each event consists of a group of four related CMEs which emerge from progressively higher latitudes over a time period of approximately 16hours. In both cases there is on-disk activity visible in EIT EUV images which involves bright emission along the south polar crown filament and there is also ejection of mass from other regions of the corona during the time period of each event. We present a multi-wavelength view of these events (i.e. white-light, Hα, EUV and, in the case of the 2-3June 1997 event, soft X-ray), which suggest that ejection of mass from one point in the corona can lead to a destabilization of a previously stable structure and the further ejection of mass from different regions of the corona, in a systematic way. The observations also show that the CME phenomenon is not always a localised event but can occur on a global level; and that complex CME activity can arise at relatively quiet-Sun periods as evidenced by the lack of significant X-ray flares or radio signatures.

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