Calibration of Polarization Data for Vector Magnetographs at the Huairou Solar Observing Station over the Past Four Decades
Author:
Su Jiangtao123ORCID, Xu Haiqing123, Liu Suo123ORCID, Lin Jiaben13, Wang Hui123, Song Yongliang13, Bai Xianyong123, Yang Shangbin123ORCID, Chen Jie123, Wang Xiaofan13, Sun Yingzi13, Yang Xiao13ORCID, Deng Yuanyong123
Affiliation:
1. National Astronomical Observatories of Chinese Academy of Sciences, Beijing 100101, China 2. School of Astronomy and Space Sciences, University of Chinese Academy of Sciences, 19 A Yuquan Road, Shijingshan District, Beijing 100049, China 3. Key Laboratory of Solar Activity and Space Weather, National Space Science Center, Chinese Academy of Sciences, Beijing 100190, China
Abstract
The Huairou Solar Observing Station (HSOS) has conducted solar vector magnetic field observations for 40 years and developed multiple vector magnetographs (including one space magnetic field observation instrument). Using these accumulated magnetic field observation data, HSOS has achieved significant progress in solar physics research, including important advancements in the helicity sign rule of solar active regions, the helicity characteristics of strong and weak magnetic fields in active regions, the chromospheric magnetic field characteristics of the Sun, the evolution of magnetic fields in active regions, and the extraction of magnetic field characteristics for flare precursors. However, due to historical reasons, the calibration of vector magnetic field data in HSOS are not standardized. Therefore, this paper summarizes past historical experiences and introduces the standardized calibration procedure for vector magnetic field processing in detail. These calibration procedures are the basic steps of the calibration process for the space vector magnetograph (Full-Disk Vector MagnetoGraph, abbreviated as FMG) observation data, and are also applicable to the calibration of other instrument observation data at HSOS. They mainly include basic processing of polarization data and in-depth processing of vector magnetic fields. We believe that such calibration processing of the historical data collected by HSOS over the past 40 years will help us to accurately measure and analyze the solar magnetic field, further revealing the laws of solar activity and its impact on the Earth’s environment.
Funder
This research was funded by the Strategic Priority Research Program on Space Science of Chinese Academy of Sciences, the National Key R\&D Program of China, Natural Science Foundation of China.
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