Flare and filament activation in an unusually distorted field configuration

Details Flare and filament activation in an unusually distorted field configuration Flare and filament activation in an unusually distorted field configuration

Mar 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987soph..108..151h&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 108, no. 1, 1987, p. 151-167.

Physics

5

H Alpha Line, Magnetic Field Configurations, Solar Flares, Solar Magnetic Field, Solar Prominences, Coronal Loops, Energetic Particles, Photosphere, Umbras

Scientific paper

Photospheric and H-alpha observations and radio flux data are used to investigate a two-ribbon flare in AR NOAA 4263 occurring on July 31, 1983 as part of a flare event complex. The F2 flare occurred in a field configuration around a double spot which was formed by splitting of a larger spot. In one of the spots, the feet of long stretched loops are pushed down under steepening loops rooted in the same spot, causing energy build-up by twist and shear in the stretched loops. One foot of the two-ribbon flare is found to be rooted in a part of the spot umbra and penumbra where the field becomes extremely flat. The radio data suggest that the observed flare and the given magnetic field structure are not very effective in energetic particle generation and escape.

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