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arXiv 2305.03217astro-ph.SR
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日冕物质抛射期间磁通量绳中磁通量的完全替换

Complete replacement of magnetic flux in a flux rope during a coronal mass ejection

Tingyu Gou, Rui Liu, Astrid M. Veronig, Bin Zhuang, Ting Li, Wensi Wang, Mengjiao Xu, Yuming Wang

AI总结:

本研究通过观测发现一种源自S形暗条的磁通量绳形成喷发新机制,其磁通量经耀斑重联完全替换,足点位移且磁通量翻倍,挑战标准模型并凸显磁重联的三维特性。

摘要:

太阳日冕物质抛射是太阳系中能量最高的事件。在其标准形成模型中,磁通量绳通过磁重联过程逐渐发展为日冕物质抛射,该过程持续将上层无扭转磁通量转化为包裹原有通量绳的扭转磁通量。然而,仅有少数日冕物质抛射以连贯的磁通量绳作为核心结构,这对这种有序包裹过程的普遍性提出了质疑。本文提供了观测证据,表明存在一种源自S形暗条的磁通量绳形成与喷发的不同机制,其磁通量通过耀斑重联被完全替换。在形成过程中,该S形结构的一个足点发生滑动和扩张,随后在喷发期间移动到一个全新的位置,这与耀斑带的高度动态演化以及通过该足点的磁通量翻倍相关。这种构型未被标准形成模型或数值模拟所预测,凸显了通量绳与周围磁场之间磁重联的三维特性。

英文摘要:

Solar coronal mass ejections are the most energetic events in the Solar System. In their standard formation model, a magnetic flux rope builds up into a coronal mass ejection through magnetic reconnection that continually converts overlying, untwisted magnetic flux into twisted flux enveloping the pre-existing rope. However, only a minority of coronal mass ejections carry a coherent magnetic flux rope as their core structure, which casts doubt on the universality of this orderly wrapping process. Here we provide observational evidence of a different formation and eruption mechanism of a magnetic flux rope from an S-shaped thread, where its magnetic flux is fully replaced via flare reconnections. One of the footpoints of the sigmoidal feature slipped and expanded during the formation, and then moved to a completely new place, associated with the highly dynamical evolution of flare ribbons and a twofold increase in magnetic flux through the footpoint, during the eruption. Such a configuration is not predicted by standard formation models or numerical simulations and highlights the three-dimensional nature of magnetic reconnections between the flux rope and the surrounding magnetic field.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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