Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...250..541m&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 250, no. 2, Oct. 1991, p. 541-547. Research supported by CNRS, CONICET, and NS
Astronomy and Astrophysics
Astrophysics
83
Magnetic Dipoles, Magnetic Field Configurations, Solar Activity Effects, Solar Flares, Solar Magnetic Field, Electric Current, H Alpha Line, Magnetic Energy Storage, Solar Corona
Scientific paper
By modeling the observed vertical magnetic field of an active region AR 2372 by the potential field of an ensemble of magnetic dipoles, the likely location of the separatrices, surfaces that separates cells of different field line connectivities, and of the separator which is the intersection of the separatrices, is derived. Four of the five off-band H-alpha kernels of a flare that occurred less than 20 minutes before obtaining the magnetogram are shown to have taken place near or at the separatrices. These H-alpha kernels are connected by field lines that pass near the separator. This indicates that the flare may have resulted from the interaction in the separator region of large scale magnetic structures.
Démoulin Pascal
Hénoux Jean-Claude
Machado Marcos E.
Mandrini Cristina Hemilse
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