Physics
Scientific paper
May 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusmsp23a..01s&link_type=abstract
American Geophysical Union, Spring Meeting 2005, abstract #SP23A-01
Physics
7513 Coronal Mass Ejections, 7524 Magnetic Fields
Scientific paper
Halo Coronal Mass Ejections (CMEs), originating near disk center, are possible sources of large geomagnetic storms. Our goal is to predict geomagnetic activities automatically and in real time based on the observations of source regions of CMEs. We have achieved the following two steps: (1) We studied the magnetic structure of a number of famous active regions that produced large flares (X5 or larger), and found a close correlation between magnetic gradient and magnetic shear; and magnetic gradient could be even a better proxy to predict where a major flare might occur. Therefore, we can avoid complication of using vector magnetograms to derive magnetic shear. (2) We investigated the relationship between geoeffectiveness and the orientation of magnetic field in source active regions. Based on the flaring neutral lines detected by step (1), we extrapolated the magnetic structure in active region with three-dimensional (3D) numerical models. We started with the potential field model. We attempt to find relationship between the the orientation of magnetic field in the source region and the hourly averaged ACE measurements of the Bz component of the interplanetary magnetic fields, that is believed to be the indicator of geomagnetic storms.
Song Hui-chao
Wang Hai-Hong
Yurchyshyn Vasyl
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