Source Regions of CMEs

Prasad Subramanian

Abstract

We have examined coronal transients observed on the solar disk in EIT 195 \A images that correspond to coronal mass ejections observed by LASCO during the solar minimum phase of Jan 1996-May 1998. The objective of the study is to gain an understanding of the source regions from which the CMEs observed in LASCO images emanate. To this end, we compare the CME source regions as discerned from EIT 195 \A images with photospheric magnetograms from the MDI instrument and the Kitt Peak NSO, and also withH alpha images from the BBSO. The overall results of our study suggest that a majority of the CME related transients observed in EIT 195 \A images are associated with active regions, and not with erupting prominences.  We have carried out detailed case studies of 5 especially well observed events. These case studies suggest that active region CMEs are often associated with the emergence of parasitic polarities into fairly rapidly evolving active regions. CMEs associated with prominence eruptions, on the other hand, are typically associated with long lived active regions

    Authors: Prasad Subramanian, K. P. Dere

  Organization: George Mason University
     Telephone: 202 767 2800
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        e-mail: psubrama@mahanadi.nrl.navy.mil
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