从磁绳的日面足迹揭示日冕物质抛射内部磁通量的演化特征  

Evolution of the toroidal flux of solar coronal mass ejections derived by tracing their on-disk footpoints

作　　者：陈何超 CHEN He-Chao(School of Earth and Space Sciences,Peking University,Beijing 100871,China)

机构地区：[1]北京大学地球与空间科学学院,北京100871

出　　处：《中国科学：物理学、力学、天文学》2021年第9期117-120,共4页Scientia Sinica Physica,Mechanica & Astronomica

基　　金：中国博士后创新人才支持计划(编号:BX20200013);中国博士后科学基金(编号:2020M680201)资助。

摘　　要：作为太阳大气中最剧烈的大尺度爆发性磁活动,日冕物质抛射是引发近地灾害性空间天气的首要驱动源.时至今日,在爆发过程中,日冕物质抛射内部轴向磁通量的详细演化特征尚不明确.近期,国内太阳物理学者提出了一种优化的识别方法,成功提取并研究了日冕物质抛射主体磁绳结构在太阳表面的足迹及其完整变化信息,发现爆发磁绳的轴向磁通具有先快速增大,随后逐渐减小的演化特征,且与伴生耀斑的能量释放过程具有很好的时间对应性.这一研究定量地给出了日冕物质抛射爆发过程中内部磁场参量的变化规律,对理解日冕物质抛射的三维爆发过程有着重要的意义.As the most violent large-scale explosive phenomenon in the solar atmosphere,coronal mass ejections(CMEs)are the main source of disastrous space weather in our solar-terrestrial environment.Detailed evolution of the toroidal magnetic flux inside CME flux ropes is still poorly understood.Recently,researchers from Nanjing University developed a new method to achieve a better identification of the footpoint regions of erupting CME flux ropes.Applying this new method,they successfully obtained and further quantitatively investigated the evolution of toroidal flux of four erupting flux ropes.They found that the toroidal flux of CME flux ropes experiences a rapid increasing phase followed by a decreasing phase.Such a two-phase evolution of toroidal flux is generally synchronous with the energy release process in CME-associated solar flares.This study provides a quantitative assessment of the variation of the toroidal flux of CME flux ropes during their eruptions,which is of vital significance for understanding the three-dimensional nature of CMEs.

关 键 词：太阳活动 日冕物质抛射 太阳耀斑 

分 类 号：P182.62[天文地球—天文学]