Ha Line Polarization in the 2B/X4.8 Flare of 2002 July 23 |
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| Authors: | Zhi Xu N M Firstova Qing-Rong Chen and Cheng Fang |
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| Institution: | Zhi Xu,N. M. Firstova,Qing-Rong Chen and Cheng Fang
Department of Astronomy,Nanjing University,Nanjing 210093, xuzhi@nju.edu.cn
Institute of Solar-Terrestrial Physics,Russian Academy of Sciences,Siberian Division,Russia |
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| Abstract: | On 2002 July 23, a 2B/X4.8 flare was observed in the Ha line spec-tropolarimetrically by the Large Solar Vacuum Telescope of Baikal Astrophysical Observatory. Linear polarization of 3%-10% was detected in the Ha line, particularly where the line showed central reversal. The linear polarization is mainly radial on the solar disk and appears at the impulsive phase of the hard X-ray and 7-ray bursts. It is limited to some relatively small regions of the flare. The polarization in a limited small region (~ 4" - 5") changed its direction within a short period of time (~ 10s). |
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| Keywords: | Polarization - line: profile - Sun: flare |
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