The application of the quickest descent method to the analysis of the Hα line in loops |
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| Authors: | Kejun Li Youji Ding Jinming Bai Shuhua Zhong Jiayu Xuan Qiongying Li |
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| Institution: | (1) Yunnan Observatory, Chinese Academy of Sciences, 650011 Yunnan, China |
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| Abstract: | The quickest descent method and the multi-layer model are proposed to analyse symmetrical and asymmetrical line profiles of
loops in this paper. By fitting observed lines, the physical parameters such as Doppler width, Δλ
D
, the optical thickness at line centre,τ
λ0, and the line displacement, Δλ
0, can be directly obtained, Using this method, some symmetrical and asymmetrical line profiles of both the loop prominence
on February 18, 1984 and the loop on August 17, 1989 are fitted. It is found that the method mentioned in this paper is characterized
by rapid convergence, high precision, and less scatter. |
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| Keywords: | |
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