Flare and filament activation in an unusually distorted field configuration |
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| Authors: | A Hofmann J Rendtel H Aurass B Kalman |
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| Institution: | (1) Zentralinstitut für Astrophysik, AdW der DDR, Sonnenobservatorium Einsteinturm, DDR-1560 Telegrafenberg, Potsdam, G.D.R.;(2) Zentralinstitut für Astrophysik, AdW der DDR, Observatorium für solare Radioastronomie, DDR-1501 Tremsdorf, G.D.R.;(3) Heliophysical Observatory Debrecen, Hungarian Academy of Sciences, Debrecen, Hungary |
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| Abstract: | Using photospheric and H observations and total radio flux data we study a two-ribbon flare in AR NOAA 4263 which was a part of a flare event complex on July 31, 1983. We find some facts which illuminate the special way of flare triggering in the analysed event. Around a double spot the photospheric vector magnetic field is discussed with respect to the chromospheric activities. In one of the spots the feet of long stretched loops are pushed down under steepening loops rooted in the same spot. This causes energy build-up by twist and shear in the stretched loops. One foot of the two-ribbon flare (triggered in the stretched and underpushed loop system) roots in a part of the spot umbra and penumbra where the field runs in extremely flat  like a pressed spiral spring . A strange radio event, starting before the flares, can be interpreted as a precursor activity of the flare event complex. The radio data support the view that the analyzed flare process and the given magnetic field structure, respectively, are not very effective in energetic particle generation and escape. |
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