Hα Line Polarization in the 2B／X4.8 Flare of 2002 July 23

On 2002 July23,a 2B/X4.8 flare was observed in the Hα line spec-tropolarimetrically by the Large Solar Vacuum Telescope of Baikal Astrophysical Observatory.Linear polarization of 3%-10% was detected in the Hα line,particu-larly where the line showed central reversal.The linear polarization is mainly...

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Bibliographic Details
Published in:Chinese journal of astronomy and astrophysics 2003-06, Vol.3 (3), p.266-276
Main Authors: Xu, Zhi, Firstova, N M, Chen, Qing-Rong, Fang, Cheng
Format: Article
Language:English
Subjects:
天体物理观测
太阳观测
线性偏振作用
脉冲波
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Summary:On 2002 July23,a 2B/X4.8 flare was observed in the Hα line spec-tropolarimetrically by the Large Solar Vacuum Telescope of Baikal Astrophysical Observatory.Linear polarization of 3%-10% was detected in the Hα line,particu-larly 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 γ-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).
ISSN:1009-9271
DOI:10.1088/1009-9271/3/3/266