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A major solar flare in a small δ-type active region

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Abstract

A small δ-type active region was observed on September 14–18, 2000 at Ganyu Station of the Purple Mountain Observatory. It developed rapidly during its passage through solar disk and there was a stereo-typed spiral filament near the magnetic inversion line on 15–17th, Sept. Its magnetic axis made an angle 85° to the equator. On Sept. 16 it produced a major flare, 3B importance, having more intense geophysical effects. Using the vector-magnetograms the distribution of magnetic field lines was deduced. The analysis of QSL stereo-map made a discovery that there is a null or separator about such spiral filament which can be used to explain the formation of this major flare and intense mass ejection.

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Authors and Affiliations

  1. Purple Mountain Observatory, Chinese Academy of Sciences, 210008, Nanjing, China

    Zhang Yan’an, Song Mutao & Ji Haisheng

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  1. Zhang Yan’an
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  2. Song Mutao
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  3. Ji Haisheng
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Correspondence to Zhang Yan’an.

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Zhang, Y., Song, M. & Ji, H. A major solar flare in a small δ-type active region. Sci. China Ser. A-Math. 45 (Suppl 1), 47–50 (2002). https://doi.org/10.1007/BF02889683

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  • DOI: https://doi.org/10.1007/BF02889683

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