Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 846, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.3847/2041-8213/aa861e
Keywords
Sun: corona; Sun: coronal mass ejections (CMEs); Sun: flares; Sun: magnetic fields
Categories
Funding
- NASA [NAS5-02139]
- NASA's LWS program
- NSF [AGS-1348577, AGS-1560411]
- NASA's HSR program
- Div Atmospheric & Geospace Sciences
- Directorate For Geosciences [1560411] Funding Source: National Science Foundation
- Div Atmospheric & Geospace Sciences
- Directorate For Geosciences [1348577] Funding Source: National Science Foundation
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The physical conditions that determine whether or not solar active regions (ARs) produce strong flares and coronal mass ejections (CMEs) are not yet well understood. Here, we investigate the association between electric-current neutralization, magnetic shear along polarity inversion lines (PILs), and eruptive activity in four ARs: two emerging and two well-developed ones. We find that the CME-producing ARs are characterized by a strongly non-neutralized total current, while the total current in the ARs that did not produce CMEs is almost perfectly neutralized. The difference in the PIL shear between these two groups is much less pronounced, which suggests that the degree of current neutralization may serve as a better proxy for assessing the ability of ARs to produce CMEs.
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