| Automatic detection and correction algorithms for magnetic saturation in the SMFT/HSOS longitudinal magnetograms |
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| 作者姓名： | 徐海清 刘锁 苏江涛 邓元勇 Andrei Plotnikov 白先勇 陈洁 杨潇 郭晶晶 王晓帆 宋永亮 |
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| 作者单位： | Key Laboratory of Solar Activity;School of Astronomy and Space Sciences;Crimean Astrophysical Observatory |
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| 基金项目： | supported by the National Natural Science Foundation of China(Grant Nos.11703042,11911530089,U1731241,11773038,11427901,11427803,11673033,U1831107,11873062);the Strategic Priority Research Program on Space Science;Chinese Academy of Sciences(Grant Nos.XDA15320302,XDA15052200,XDA15320102);the13th Five-year Informatization Plan of Chinese Academy of Sciences(Grant No.XXH13505–04)。 |
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| 摘 要： | A longitudinal magnetic field often suffers the saturation effect in a strong magnetic field region when the measurement is performed at a single-wavelength point and linear calibration is adopted.In this study,we develop a method that can judge the threshold of saturation in Stokes V/I observed by the Solar Magnetic Field Telescope(SMFT)and correct it automatically.The procedure is to first perform the second-order polynomial fit to the Stokes V/I vs.I/Im(Im is the maximum value of Stokes I)curve to estimate the threshold of saturation,then reconstruct Stokes V/I in a strong field region to correct for saturation.The algorithm is demonstrated to be effective by comparing with the magnetograms obtained by the Helioseismic and Magnetic Imager(HMI).The accuracy rate of detection and correction for saturation is~99.4%and~88%respectively among 175 active regions.The advantages and disadvantages of the algorithm are discussed.
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| 关 键 词： | Sun:sunspots Sun:magnetic field Methods:data analysis |
Automatic detection and correction algorithms for magnetic saturation in the SMFT/HSOS longitudinal magnetograms |
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| Hai-Qing Xu,Suo Liu,Jiang-Tao Su,Yuan-Yong Deng,Andrei Plotnikov,Xian-Yong Bai,Jie Chen,Xiao Yang,Jing-Jing Guo,Xiao-Fan Wang,Yong-Liang Song.Automatic detection and correction algorithms for magnetic saturation in the SMFT/HSOS longitudinal magnetograms[J].Research in Astronomy and Astrophysics,2021(3):158-166. |
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| Authors: | Hai-Qing Xu Suo Liu Jiang-Tao Su Yuan-Yong Deng Andrei Plotnikov Xian-Yong Bai Jie Chen Xiao Yang Jing-Jing Guo Xiao-Fan Wang Yong-Liang Song |
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| Institution: | (Key Laboratory of Solar Activity,National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100101,China;School of Astronomy and Space Sciences,University of Chinese Academy of Sciences,Beijing 100049,China;Crimean Astrophysical Observatory,Russian Academy of Sciences,Nauchny,Crimea,298409,Russi) |
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