3D Structure of Arcade-Type Flares Derived from the Homologous Flare Series of 21, 24, and 27 February 1992 |
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| Authors: | Morita Satoshi Uchida Yutaka Hirose Shigenobu Uemura Shuhei Yamaguchi Tomotaka |
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| Institution: | (1) Department of Physics, Faculty of Science, Science, University of Tokyo, Shinjuku-ku, Tokyo 162-8601, Japan (;(2) Department of Physics, Faculty of Science, Science, University of Tokyo, Shinjuku-ku, Tokyo 162-8601, Japan |
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| Abstract: | In February 1992, three flares, which we consider constitute a homologous flare series (flares having basically the same configuration repeating in the same situation), occurred in the active region NOAA 7070 and were observed by Yohkoh SXT. In the present paper, we first discuss the homology of these three flares, and derive the 3D structure by making use of the information obtained from the three different lines of sight at common phases. The result of this analysis made clear for the first time that the so-called `cusped arcade' at the maximum phase in the well-known 21 February 1992 flare is, contrary to the general belief, an `elongated arch' created at the beginning of the flare, seen with a shallow oblique angle. It is not the `flare arcade' seen on axis as widely conceived. This elongated arch roughly coincides with a diagonal of the main body of the soft X-ray arcade that came up later. The magnetic structure responsible for the flare as a whole turned out to be a structure with quadruple magnetic sources – with the third and fourth sources also playing essential roles. The observationally derived information in our paper provides strong restrictions to the theoretical models of the process occurring in arcade flares. |
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