The eruption of active region filaments and its relation to the triggering of a solar flare

Details The eruption of active region filaments and its relation to the triggering of a solar flare The eruption of active region filaments and its relation to the triggering of a solar flare

May 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981soph...71..125k&link_type=abstract

Solar Physics, vol. 71, May 1981, p. 125-139. Research supported by the Nederlandse Organisatie voor Zuiver-Wetenschappelijk Ond

Physics

36

Coronal Loops, Neutral Sheets, Solar Flares, Solar Magnetic Field, Solar Prominences, Current Distribution, Equilibrium Equations, H Alpha Line, Lines Of Force, Magnetic Field Configurations, Magnetic Flux, Solar Activity Effects

Scientific paper

The onset of filament eruption is due to changes in the background magnetic field or the increase of the filament current intensity, both of which can be caused by the emergence of new magnetic flux and by the motion of the photospheric footpoints of the magnetic field lines. It is shown that if the background field evolves from a potential field to a nearly force-free field, the vertical equilibrium of the current filament is not affected, but large forces are generated along the filament axis, which is identified as the cause of filament activation and the increase in filament turbulence during the flare build-up phase. Two different scenarios for flare build-up and filament eruption are noted, depending on the evolution of the background field and the current filament. The process of flare energy build-up in a bipolar magnetic region is discussed, concentrating on the effect of the presence of the photospheric boundary, together with the multiple effects of flare triggering, when new magnetic flux emerges and intrudes in the existing bipolar region.

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