期刊
ASTROPHYSICAL JOURNAL
卷 689, 期 2, 页码 1433-1442出版社
IOP PUBLISHING LTD
DOI: 10.1086/591045
关键词
Sun: coronal mass ejections (CMEs); Sun: magnetic fields
资金
- NSF's Division of Atmospheric Sciences through its SHINE and Space Weather
- NASA's Science Mission Directorate through the Living With a Star Targeted Research and Technology
For investigating the magnetic causes of coronal mass ejections (CMEs) and for forecasting the CME productivity of active regions, in previous work we have gauged the total nonpotentiality of a whole active region by either of two measures, L(SSM) and L(SGM), two measures of the magnetic field along the main neutral line in a vector magnetogram of the active region. This previous work was therefore restricted to nominally bipolar active regions, active regions that have a clearly identifiable main neutral line. In the present paper, we show that our work can be extended to include multipolar active regions of any degree of magnetic complexity by replacing L(SSM) and L(SGM) with their generalized counterparts, WL(SS) and WL(SG), which are corresponding integral measures covering all neutral lines in an active region instead of only the main neutral line. In addition, we show that for active regions within 30 heliocentric degrees of disk center, WL(SG) can be adequately measured from line-of-sight magnetograms instead of vector magnetograms. This approximate measure of active-region total nonpotentiality, (L)WL(SG), with the extensive set of 96 minute cadence full-disk line-of-sight magnetograms from SOHO MDI, can be used to study the evolution of active-region total nonpotentiality leading to the production of CMEs.
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