Other
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsp51c..08p&link_type=abstract
American Geophysical Union, Spring Meeting 2008, abstract #SP51C-08
Other
7513 Coronal Mass Ejections (2101), 7519 Flares
Scientific paper
Solar flares are caused by impulsive and large energy release in the corona, presumably through the fast magnetic reconnection resulting in efficient particle acceleration and strong heating. It has been found that about 90% of X-class flares are associated with coronal mass ejections (CMEs), which involve the transformation and ejection of a large scale coronal magnetic structure. About 50% of the less energetic M-class flares are associated with CMEs, and even a smaller percentage for C-class and weaker flares. The question is why some flares are eruptive (associated with CMEs), and some other flares are confined (energy release without large scale ejection). We have made a preliminary study on all X-class, 124 in total, and M-class flares, 1427 in total, from 1996-2005. For each of these flares, based on a combination of NOAA/SEC flare report and SOHO EIT and LASCO observations, we identify its surface source region and then determine its eruptiveness. We then carefully analyze the magnetic properties of the source regions of the two types of flares. For the efficiency of mass processing, we use the MDI Carrington synoptic charts instead of individual magnetogram images. For each source region, we extract a set of parameters, including the distance between flare location and the center of mass (COM) of the magnetic field distribution, total flux, length of neutral lines etc. This study will help understand the flare eruptiveness. Further, such a comprehensive statistical study may yield useful empirical relation to predict the flare eruption based on the source region properties, which is useful for forecasting space weather.
Poomvises Watanachak
Wang Yadong
Zhang James J.
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