Other
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sh62a11z&link_type=abstract
American Geophysical Union, Spring Meeting 2001, abstract #SH62A-11
Other
7509 Corona, 7513 Coronal Mass Ejections
Scientific paper
We investigate the solar origin of major geo-magnetic storms which occurred between 1996 and 2000. Based on the hourly DST index, we identify 39 major geo-magnetic storms (defined as peak DST less than -100) in this period. The solar observations are primarily based on LASCO (Large-Angle and Spectrometric Coronagraph) and EIT (Extreme-ultraviolet Imaging Telescope) instruments on board SOHO spacecraft. Using a six-day time window, we search through all halo/partial-halo CMEs (Coronal Mass Ejections) seen in LASCO and coronal dimmings seen in EIT for each storm to try to identify its solar source. 30 of the 39 storms are in the LASCO/EIT duty cycle (most of the other 9 events occurred during 1998-1999 SOHO failure). We associate these storms to solar sources with three different confidence levels. For 18 of the 30 events, we have reliably determined their solar sources, all of which show both strong halo CME signature and almost simultaneous strong coronal dimming signature; these signatures are usually unique in the time window. For 5 of the 30 events, there are multiple halo CMEs and dimmings found in the time window, and we can not make unambiguous association with a particular solar source. For the other 7 of the 30 events, we find it is difficult to identify solar sources, due to lack of strong signature in either LASCO or EIT observations or both. We investigate various characteristics of solar sources for those 18 major storms with unambiguous association, including CME morphology and kinematics, pre-eruption coronal structure and evolution, coronal dimmings and waves, coronal post-eruption loops, X-ray and optical flares, filaments, photospheric magnetic field structure and distribution of heliocentric position. The purpose is to understand the characteristics of CMEs observed near the Sun which causes major geo-magnetic storms.
Dere Ken P.
Howard Russ A.
Zhang James J.
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