Rapid sunspot motion during a major solar flare |
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| Authors: | B. Anwar L. W. Acton H. S. Hudson M. Makita A. N. McClymont S. Tsuneta |
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| Affiliation: | (1) Kwasan and Hida Observatories, Kyoto University, Yamashina-ku, 607 Kyoto, Japan;(2) Ionospheric Research and Development Centre, National Institute of Aeronautics and Space, Jl. Dr. Junjunan 135, 40173 Bandung, Indonesia;(3) Lockheed Palo Alto Research Laboratory, 3251 Hanover St., 94304 Palo Alto, CA, USA;(4) Institute for Astronomy, University of Hawaii, 2680 Woodlawn Dr., 96822 Honolulu, HI, USA;(5) Kwasan and Hida Observatories, Kyoto University, Yamashina-ku, 607 Kyoto, Japan;(6) Institute for Astronomy, University of Hawaii, 2680 Woodlawn Dr., 96822 Honolulu, HI, USA;(7) Institute of Astronomy, University of Tokyo, Osawa, Mitaka, 181 Tokyo, Japan |
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| Abstract: | 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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