HR: 1340h
AN: SH23A-0310    [Abstracts]
TI: Magnetic Structures of Solar Active Regions, Full Halo Coronal Mass Ejections, and Geomagnetic Storms
AU: * Liu, Y
EM: yliu@quake.stanford.edu
AF: W. W. Hansen Experimental Physics Laboratory, Stanford University, 455 Via Palou, Stanford, CA 94305 United States
AU: Webb, D F
EM: David.Webb@hanscom.af.mil
AF: Institute for Scientific Research, Boston College, Chestnut Hill, Massachusetts, and also at Air Force Research Laboratory, Hanscom AFB, Massachusetts., 140 Commonwealth Ave., Chestnut Hill, MA 02467 United States
AU: Zhao, X
EM: zhao@quake.stanford.edu
AF: W. W. Hansen Experimental Physics Laboratory, Stanford University, 455 Via Palou, Stanford, CA 94305 United States
AB: We have analyzed 3 active regions to investigate the relationship between magnetic configurations of active regions and geomagnetic storms. Each active region was associated with multiple full halo coronal mass ejections (CMEs). This study demonstrates that, although full halo CMEs may originate from the same active region, they may or may not cause geomagnetic storms, depending on the magnetic configurations actually involved in the corresponding flare activities. This implies that (1) the flares, CMEs and geomagnetic storms are closely related magnetically, as already suggested by many others, and (2) the occurrence of solar active region-related geomagnetic storms may be determined by the magnetic fields which are involved in the corresponding solar flares. These associations suggest ways to improve geomagnetic storm prediction.
DE: 7513 Coronal mass ejections (2101)
DE: 7524 Magnetic fields
DE: 7954 Magnetic storms (2788)
SC: SPA-Solar and Heliospheric Physics [SH]
MN: Fall Meeting 2005