Magnetic field and current sheets in the corona above active regions |
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| Authors: | Takashi Sakurai Yutaka Uchida |
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| Institution: | (1) Dept. of Astronomy, University of Tokyo, Bunkyo-ku, Tokyo, Japan;(2) Tokyo Astronomical Observatory, University of Tokyo, Mitaka, Tokyo, Japan |
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| Abstract: | A new method for the calculation of coronal magnetic field is proposed and it is shown to reproduce the EUV features in the corona as observed by Skylab experiments satisfactorily well. One of the remarkable points is that it reproduces the loopy threads in the active region corona and also the large scale field lines connecting active regions. The existence of coronal current is expected wherever the present coronal-current-free model fails to represent the feature. A method of calculating the coronal sheet-current is also developed with the purpose of knowing the shape of the current sheet and the amount of magnetic stress energy stored due the the presence of it by comparing the calculated field configuration with the observed local distortion of the EUV threads. This may be used in pinning down the possible site of the flare and in discussing the flare occurrence in terms of the energy stored there.During the preparation of this work, Poletto et al. (1975) calculated the magnetic field shape in Schmidt's method to compare with the soft X-ray feature obtained by Skylab. |
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