Rapid Sunspot Motion during a Major Solar Flare

Details Rapid Sunspot Motion during a Major Solar Flare Rapid Sunspot Motion during a Major Solar Flare

Oct 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993soph..147..287a&link_type=abstract

Solar Physics, Volume 147, Issue 2, pp.287-303

Physics

21

Scientific paper

A major solar flare on 15 November, 1991 produced a striking perturbation in the position and shape of the sunspot related most closely to the flare. We have studied these perturbations by use of the aspect-sensor images from the Soft X-ray Telescope on board YOHKOH, and with ground-based data from the Mees Solar Observatory. The perturbation occurred during the impulsive phase of the flare, with a total displacement on the order of 1 arc sec. The apparent velocity of approximately 2 km s-1 exceeds that typically reported for sunspot proper motions even in flare events. We estimate that the magnetic energy involved in displacing the sunspot amounted to less than 4 × 1030 ergs, comparable to the radiant energy from the perturbed region. Examination of the Mees Observatory data shows that the spot continued moving at lower speed for a half-hour after the impulsive phase. The spot perturbation appears to have been a result of the coronal restructuring and flare energy release, rather than its cause.

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