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.
作者
李乐平
Hardi Peter
Lakshmi Pradeep Chitta
宋红强
Le-Ping Li;Hardi Peter;Lakshmi Pradeep Chitta;Hong-Qiang Song(CAS Key Laboratory of Solar Activity,National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100101,China;University of Chinese Academy of Sciences,Beijing 100049,China;Max Planck Institute for Solar System Research,D-37077 Gottingen,Germany;Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment,and Institute of Space Sciences,Shandong University,Weihai 264209,China)
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)。