Studies on a very flare-active delta group - Peculiar delta SPOT evolution and inferred subsurface magnetic rope structure

Details Studies on a very flare-active delta group - Peculiar delta SPOT evolution and inferred subsurface magnetic rope structure Studies on a very flare-active delta group - Peculiar delta SPOT evolution and inferred subsurface magnetic rope structure

Nov 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991soph..136..133t&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 136, Nov. 1991, p. 133-149.

Physics

122

Magnetic Field Configurations, Magnetic Storms, Solar Activity Effects, Solar Flares, High Resolution, Magnetic Anomalies, Morphology, Umbras

Scientific paper

High-resolution evolutionary data from BBSO magnetic and velocity data are used to investigate the complex subsurface magnetic rope structure of a very flare-active isolated delta group. This group showed unusually fast evolution accompanied by a number of intense flares occurring on the neutral line of a delta spot, and made it possible to study the inherent relation of flare occurrence to changes of the magnetic configuration. The evolution of this isolated delta group is shown to decompose into two flare-associated elementary modes: shearing produced by spot growth, and reduction of shear as spots disappear. A model of an emerging twisted magnetic knot is proposed to explain the two modes and is realistically applied to the present evolution. The inferred magnetic topological structure of this region consists of tightly twisted knots and a long-winding twisted rope with an internally reversed loop and a hooked bottom structure. The abnormal evolution of this delta group is explained by their consecutive emergences.

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