2个太阳爆发事件中磁准分界面的演化

发布时间：2017-12-28 08:19

本文关键词：2个太阳爆发事件中磁准分界面的演化　出处：《天文学报》2017年03期 　论文类型：期刊论文

【摘要】：磁准分界面(Quasi-Separatrix Layer,简称QSL)是3维磁结构中磁力线连接性发生显著改变的区域,观测表明它多数时候和耀斑带所在的位置符合得较好.有关这一结构和3维磁重联及耀斑关系的研究在近年来受到越来越多的关注.从QSL的理论出发,研究了2011年12月26日在活动区AR11384发生的一个C5.7级典型双带耀斑(事件1)和2015年6月22日发生在活动区AR12371处的一个M6.5级耀斑(事件2).结合SDO/AIA(Solar Dynamics Observatory/Atmospheric Imaging Assembly)观测到的多波段数据和SDO/HMI(Helioseismic and Magnetic Imager)观测到的矢量磁场数据,首先分别利用势场和非线性无力场对日冕的3维磁场结构进行了外推,并计算了活动区磁自由能的演化;然后基于势场和非线性无力场的外推结果计算了不同高度处磁压缩因子(magnetic squashing factor)Q的对数分布,并研究了不同高度磁准分界面与相应高度处观测到的耀斑带的演化关系.最后分析了2个耀斑事件的多波段演化特征,并计算得到事件2中磁力线的平均滑动速度在304?A波段和335?A波段分别为4.6 km·s~(-1)和6.3 km·s~(-1).研究发现:计算得到的磁准分界面在色球和日冕中的位置和相应高度观测到的耀斑带的位置符合得较好,而且各层次的磁准分界面与相应层次的耀斑亮带在时间上也有近乎一致的演化行为,这突显出了磁准分界面理论在3维磁重联和耀斑研究中的作用,并证实事件2耀斑能量的释放可能是通过发生在QSL处的磁重联进行的,同时说明,研究QSL对于理解2维磁重联和3维磁重联本质联系是至关重要的.
[Abstract]:Magnetic interface (Quasi-Separatrix Layer, referred to as quasi QSL) is 3 dimensional magnetic structures and magnetic connectivity changed significantly the area, observations indicate that most of the time and location of the flare with good agreement. The research about the structure and the 3 dimensional magnetic reconnection and flare relations in recent years has attracted more and more attention of. From the theory of QSL, C5.7 studied the typical two-ribbon flare active region AR11384 occurred in December 26, 2011 (1 events) and a M6.5 flare occurred in June 22, 2015 in the activity area at AR12371 (Event 2). Combined with the SDO/AIA (Solar Dynamics Observatory/Atmospheric Imaging Assembly) observed multi band data (Helioseismic and and SDO/HMI Magnetic Imager) vector magnetic field data observed, first using potential field and weak nonlinear field on 3 dimensional coronal magnetic field structure of external push, and calculation The evolution of active region magnetic free energy; then potential field and nonlinear extrapolation based on the results of the calculation of the weak field at different heights (magnetic squashing magnetic compression factor factor) logarithmic distribution of Q, and studied the evolution between different height and height at the interface of the corresponding magnetic quasi observed flare zone was analyzed. Finally the multi band 2 flare evolution features and calculate the average sliding speed event 2 lines in 304? A band and A band respectively 335? 4.6 km - s~ (-1) and 6.3 km s~ (-1). The study found that: the position and height of the corresponding flares observed with the position of the calculated magnetic quasi boundary surface in the chromosphere and corona in good agreement, and the level of the interface and the corresponding level of magnetic quasi flare bright band in time there almost the same evolutionary behavior, which highlights the quasi 3 dimensional magnetic interface theory in magnetic reconnection and flares The role of the study and the confirmation of event 2 flare energy release may be carried out by magnetic reconnection occurring at QSL. At the same time, it is indicated that studying QSL is very important for understanding the essential relationship between 2 dimensional magnetic reconnection and 3 dimensional magnetic reconnection.
【作者单位】：中国科学院云南天文台;中国科学院大学;中国科学院天文大科学研究中心;云南师范大学旅游与地理科学学院;
【基金】：国家自然科学基金项目(11273055、11333007、U1631130) 973项目(2013CBA01503) 中国科学院先导B类项目(XDB09040202) 前沿科学重点研究项目(QYZDJ-SSW-SLH012)资助
【分类号】：P182
【正文快照】： 1引言磁重联是天体物理、太阳物理和空间等离子体物理中的一个普遍而又重要的课题, 它是磁化等离子体中磁能释放或转化的机制[1].在太阳大气中,它使得储存在磁场当中的磁自由能迅速转化为等离子体的动能、热能以及高能带电粒子的动能,产生耀斑和日冕物质抛射这些太阳大气中剧

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