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arXiv 2301.03239astro-ph.SRphysics.plasm-phphysics.space-ph
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等离子体团调制重联理论与太阳耀斑观测的联系

Connecting theory of plasmoid-modulated reconnection to observations of solar flares

Andrew Hillier, Shinsuke Takasao

摘要:

太阳耀斑重联过程的时间尺度很短,这一直是一个谜。最近的研究表明,在重新连接的电流片的等离子体团的形成的重要性,与量化的宽度与长度的电流片的纵横比在伦德奎斯特数的负功率$α$,即$S^{-α}$,是关键的理解等离子体团形成的开始。在本文中,我们第一次应用的理论缩放这个长宽比观察到的耀斑,以评估如何等离子体团的形成可能与观测。我们发现,对于三个不同的耀斑显示等离子体团的范围内的$α$值的$α= 0.27$到$0.31$。在这个小范围内的值意味着等离子体团可能在达到理论预测的临界纵横比($α=1/3$)之前形成,这可能对理论模型提出挑战。

英文摘要:

The short timescale of the solar flare reconnection process has long proved to be a puzzle. Recent studies suggest the importance of the formation of plasmoids in the reconnecting current sheet, with quantifying the aspect ratio of the width to length of the current sheet in terms of a negative power $α$ of the Lundquist number, i.e. $S^{-α}$, being key to understanding the onset of plasmoids formation. In this paper we make the first application of theoretical scalings for this aspect ratio to observed flares to evaluate how plasmoid formation may connect with observations. We find that for three different flares showing plasmoids a range of $α$ values of $α= 0.27$ to $0.31$. The values in this small range implies that plasmoids may be forming before the theoretically predicted critical aspect ratio ($α=1/3$) has been reached, potentially presenting a challenge for the theoretical models.

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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