Application of a Magnetic-field-induced Transition in Fe X to Solar and Stellar Coronal Magnetic Field Measurements  

作　　者：Yajie Chen Wenxian Li Hui Tian Xianyong Bai Roger Hutton Tomas Brage 

机构地区：[1]School of Earth and Space Sciences,Peking University,Beijing 100871,China [2]Max Planck Institute for Solar System Research,Gottingen D-37077,Germany [3]National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100101,China [4]Department of Astronomy,Beijing Normal University,Beijing 100875,China [5]Division of Mathematical Physics,Lund University,PO Box 118,sE-22100 Lund,Sweden

出　　处：《Research in Astronomy and Astrophysics》2023年第2期1-17,共17页天文和天体物理学研究（英文版）

基　　金：supported by the National Natural Science Foundation of China(NSFC,Grant Nos.11825301,12103066 and12073004).

摘　　要：Magnetic fields play a key role in driving a broad range of dynamic phenomena in the atmospheres of the Sun and other stars.Routine and accurate measurements of the magnetic fields at all the atmospheric layers are of critical importance to understand these magnetic activities,but in the solar and stellar coronae such a measurement is still a challenge due to the weak field strength and the high temperature.Recently,a magnetic-field-induced transition(MIT)of Fe X at 257.26A has been proposed for the magnetic field measurements in the solar and stellar coronae.In this review,we present an overview of recent progresses in the application of this method in astrophysics.We start by introducing the theory underlying the MIT method and reviewing the existing atomic data critical for the spectral modeling of Fe X lines.We also discuss the laboratory measurements that verify the potential capability of the MIT technique as a probe for diagnosing the plasma magnetic fields.We then continue by investigating the suitability and accuracy of solar and stellar coronal magnetic field measurements based on the MIT method through forward modeling.Furthermore,we discuss the application of the MIT method to the existing spectroscopic observations obtained by the Extreme-ultraviolet Imaging Spectrometer onboard Hinode.This novel technique provides a possible way for routine measurements of the magnetic fields in the solar and stellar coronae,but still requires further efforts to improve its accuracy.Finally,the challenges and prospects for future research on this topic are discussed.

关 键 词：SUN corona-Sun magnetic fields-Sun UV radiation 

分 类 号：P353[天文地球—空间物理学]