Gradual Solar Coronal Dimming and Evolution of Coronal Mass Ejection in the Early Phase
Gradual Solar Coronal Dimming and Evolution of Coronal Mass Ejection in the Early Phase
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太阳日冕逐渐变暗和早期日冕物质抛射的演化
DOI：
10.3847/2041-8213/aa6798
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Cheng Jianxia
中科院分区：
文献类型：
--
作者：
Qiu Jiong;Cheng Jianxia
我们报道了在一个双带耀斑和一个快速日冕物质抛射（CME）的爆发事件中观测到的两阶段日冕变暗。在双带耀斑爆发和CME快速上升之前，微弱的逐渐变暗持续了半个多小时。随后是突然的快速变暗。两阶段调光发生在两个耀斑带附近的一对共轭调光区，耀斑爆发标志着两阶段调光之间的过渡。在双带耀斑开始时，在快速变暗发生在相同的地方之前，在变暗区域内也观察到短暂的增亮。这些观测结果表明，日冕物质抛射的结构，最有可能锚定在双调光区，经历了一个缓慢的上升之前，耀斑爆发，其运动学演化有显着的变化，在耀斑重联的发病。我们探索诊断的CME演化在早期阶段的逐渐变暗的签名分析之前的CME爆发。
We report observations of a two-stage coronal dimming in an eruptive event of a two-ribbon flare and a fast coronal mass ejection (CME). Weak gradual dimming persists for more than half an hour before the onset of the two-ribbon flare and the fast rise of the CME. It is followed by abrupt rapid dimming. The two-stage dimming occurs in a pair of conjugate dimming regions adjacent to the two flare ribbons, and the flare onset marks the transition between the two stages of dimming. At the onset of the two-ribbon flare, transient brightenings are also observed inside the dimming regions, before rapid dimming occurs at the same places. These observations suggest that the CME structure, most probably anchored at the twin dimming regions, undergoes a slow rise before the flare onset, and its kinematic evolution has significantly changed at the onset of flare reconnection. We explore diagnostics of the CME evolution in the early phase with analysis of the gradual dimming signatures prior to the CME eruption.