Magnetic flux ropes in the solar corona: structure and evolution toward eruption  

作　　者：Rui Liu 

机构地区：[1]CAS Key Laboratory of Geospace Environment,Department of Geophysics and Planetary Sciences,University of Science and Technology of China,Hefei 230026,China [2]CAS Center for Excellence in Comparative Planetology,Hefei 230026,China [3]Mengcheng National Geophysical Observatory,University of Science and Technology of China,Mengcheng 233500,China

出　　处：《Research in Astronomy and Astrophysics》2020年第10期287-328,共42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(Grant Nos.41761134088,41774150,and 11925302);CAS Key Research Program(Grant No.KZZD-EW-01-4);the fundamental research funds for the central universities,and the Strategic Priority Program of the Chinese Academy of Sciences(Grant No.XDB41000000)。

摘　　要：Magnetic flux ropes are characterized by coherently twisted magnetic field lines,which are ubiquitous in magnetized plasmas.As the core structure of various eruptive phenomena in the solar atmosphere,flux ropes hold the key to understanding the physical mechanisms of solar eruptions,which impact the heliosphere and planetary atmospheres.The strongest disturbances in the Earth’s space environments are often associated with large-scale flux ropes from the Sun colliding with the Earth’s magnetosphere,leading to adverse,sometimes catastrophic,space-weather effects.However,it remains elusive as to how a flux rope forms and evolves toward eruption,and how it is structured and embedded in the ambient field.The present paper addresses these important questions by reviewing current understandings of coronal flux ropes from an observer’s perspective,with an emphasis on their structures and nascent evolution toward solar eruptions,as achieved by combining observations of both remote sensing and in-situ detection with modeling and simulation.This paper highlights an initiation mechanism for coronal mass ejections(CMEs)in which plasmoids in current sheets coalesce into a’seed’flux rope whose subsequent evolution into a CME is consistent with the standard model,thereby bridging the gap between microscale and macroscale dynamics.

关 键 词：magnetic fields magnetic reconnection Sun:magnetic fields Sun:corona Sun:coronal mass ejections(CMEs) Sun:flares Sun:filaments prominences 

分 类 号：P182.62[天文地球—天文学]