Abstract
Observations are reported of two multiple CME events which were detected on 2–3 June 1997 and 9–10 June 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 16 hours. 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 2–3 June 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.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
