Spiral filaments — The signature of singular points in a large delta spot

Details Spiral filaments — The signature of singular points in a large delta spot Spiral filaments — The signature of singular points in a large delta spot

May 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996soph..165..395h&link_type=abstract

Solar Physics, Volume 165, Issue 2, pp.395-397

Physics

5

Scientific paper

A large delta spot (active region NOAA 6891, October 23 November 4, 1991) is analysed, and it is found that some spiral filaments across the spot can be regarded as signatures of a singular point entity (SPE) which lies near a separator of this complicated magnetic field region. Near such an entity, 86% of the flares in the region were produced, including two white-light flares, one of which, being the largest flare of the region, was accompanied by a powerful mass ejection. In an island delta spot, a SPE could be recognized very close to the usual U-shaped inversion lines. Together with the other characteristics (bright Hα emission, highly sheared magnetic field, umbra obscured by Hα, magnetic flux imbalance in the range 2∶1 3∶1), the SPE can help us to predict effectively the sites for great flares to occur (Zirin and Liggett, 1987).

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