[Title] On the Relation Between Coronal Green Line Brightness and Magnetic Fields Intensity

• Impact Factor:2.8
• DOI number:10.1088/1674-4527/ac6fb8
• Teaching and Research Group:天体物理
• Journal:Research in Astronomy and Astrophysics
• Key Words:Sun: magnetic fields;Sun: corona;Stars: coronae;Sun: activity;Sun: atmosphere;Sun: coronal mass ejections (CMEs);Sun: fundamental parameters;Sun: heliosphere;Sun: UV radiation
• Abstract:Two-dimensional solar coronal magnetic fields are difficult to be measured directly. Using coronal green-line (Fe XIV 5303 Å) images obtained by the Yunnan Observatories Green-line Imaging System (YOGIS) of the 10 cm Lijiang coronagraph and coronal magnetic field maps extrapolated from SDO/HMI magnetograms with the PFSS model,this work investigates the relationship between coronal green-line brightness and magnetic field intensity. Coronal loop structures are identified and two-dimensional magnetic field intensity maps in the plane of the sky are constructed. Correlation coefficients between coronal brightness and magnetic field intensity are derived at different heights. The results show that the correlation reaches a maximum value of about 0.82 near 1.1 solar radii,corresponding to the tops of closed coronal loops,indicating a close relationship between green-line emission and coronal magnetic fields.
• Co-author:Liu Y,Zhao MY,Song TF,Wang JX,Li XB,Li ZH
• First Author:Zhang XF
• Document Code:036
• Discipline:Science
• First-Level Discipline:Astronomy
• Volume:22
• Issue:7
• Page Number:id.075007, 11 pp.
• ISSN No.:1674-4527
• Translation or Not:no
• Date of Publication:2022-07-14