Revisiting the formation mechanism for coronal rain from previous studies

作     者：李乐平 Hardi Peter Lakshmi Pradeep Chitta 宋红强 Le-Ping Li;Hardi Peter;Lakshmi Pradeep Chitta;Hong-Qiang Song

作者机构：CAS Key Laboratory of Solar ActivityNational Astronomical ObservatoriesChinese Academy of SciencesBeijing 100101China University of Chinese Academy of SciencesBeijing 100049China Max Planck Institute for Solar System ResearchD-37077 GottingenGermany Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environmentand Institute of Space SciencesShandong UniversityWeihai 264209China 

出 版 物：《Research in Astronomy and Astrophysics》 (天文和天体物理学研究（英文版）)

年 卷 期：2021年第21卷第10期

页      面：135-150页

核心收录：

学科分类：07[理学] 070401[理学-天体物理] 0704[理学-天文学] 

基　　金：supported by the Strategic Priority Research Program of Chinese Academy of Sciences(Grant No.XDB 41000000) the National Natural Science Foundation of China(Grant Nos.12073042 and 11873059) the Key Research Program of Frontier Sciences(ZDBS-LYSLH013)of Chinese Academy of Sciences the Key Programs(QYZDJ-SSW-SLH050)of Chinese Academy of Sciences Yunnan Academician Workstation of Wang Jingxiu(No.202005AF150025) supported by the National Natural Science Foundation of China(U2031109)。 

主　　题：plasmas instabilities Sun:corona Sun:UV radiation magnetic reconnection Sun:magnetic fields 

摘      要：Solar coronal rain is classified generally into two categories:flare-driven and quiescent coronal rain.The latter is observed to form along both closed and open magnetic field structures.Recently,we proposed that some of the quiescent coronal rain events,detected in the transition region and chromospheric diagnostics,along loop-like paths could be explained by the formation mechanism for quiescent coronal rain facilitated by interchange magnetic reconnection between open and closed field lines.In this study,we revisited 38 coronal rain reports from the literature.From these earlier works,we picked 15 quiescent coronal rain events out of the solar limb,mostly suggested to occur in active region closed loops due to thermal nonequilibrium,to scrutinize their formation mechanism.Employing the extreme ultraviolet images and line-of-sight magnetograms,the evolution of the quiescent coronal rain events and their magnetic fields and context coronal structures is examined.We find that six,comprising 40%,of the 15 quiescent coronal rain events could be totally or partially interpreted by the formation mechanism for quiescent coronal rain along open structures facilitated by interchange reconnection.The results suggest that the quiescent coronal rain facilitated by interchange reconnection between open and closed field lines deserves more attention.