| Title | Forward Modeling of Magnetic Field Measurements at the Bases of Stellar Coronae through Extreme-ultraviolet Spectroscopy |
| Authors | Liu, Xianyu Tian, Hui Chen, Yajie Li, Wenxian Jin, Meng Bai, Xianyong Yang, Zihao |
| Affiliation | Peking Univ, Sch Earth & Space Sci, Beijing 100871, Peoples R China Chinese Acad Sci, Natl Space Sci Ctr, State Key Lab Space Weather, Beijing 100190, Peoples R China Chinese Acad Sci, Natl Astron Observ, Key Lab Solar Activq, Beijing 100012, Peoples R China SETI Inst, 339 N Bernardo Ave Suite 200, Mountain View, CA 94043 USA Univ Chinese Acad Sci, Sch Astron & Space Sci, Beijing 100049, Peoples R China |
| Keywords | INDUCED TRANSITION TOPOLOGIES STRENGTHS EMISSION REGION |
| Issue Date | 1-Oct-2022 |
| Publisher | ASTROPHYSICAL JOURNAL |
| Abstract | Measurements of the stellar coronal magnetic field are of great importance for understanding stellar magnetic activity, yet such measurements have been extremely difficult to obtain. Recent studies proposed a new method of obtaining magnetic field measurements based on the magnetic-field-induced transition (MIT) of the Fe x ion. Here we construct a series of stellar coronal magnetohydrodynamics models and synthesize several Fe x emission lines at extreme-ultraviolet wavelengths, and then diagnose the magnetic field strength at the bases of the coronae using the MIT technique. Our results show that the technique can be applied to some stars with magnetic fields more than three times higher than that of the Sun at solar maximum. Furthermore, we investigate the uncertainty of the derived magnetic field strength caused by photon counting errors and find that a signal-noise ratio of similar to 50 for the Fe x 175 angstrom line is required to achieve effective measurements of the stellar coronal magnetic field. |
| URI | http://hdl.handle.net/20.500.11897/655726 |
| ISSN | 0004-637X |
| DOI | 10.3847/1538-4357/ac91c7 |
| Indexed | SCI(E) |
| Appears in Collections: | 地球与空间科学学院 |
