arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2409.07261astro-ph.SR
收藏

日冕物质抛射(CME)起始的光球特征

Photospheric signatures of CME onset

Aslam Ottupara, David MacTaggart, Tom Williams, Lyndsay Fletcher, Paolo Romano

AI总结:

本研究通过分析30次日冕物质抛射(CME)事件,利用ARTop和ALMANAC代码证实光球层极性反转线处的磁拓扑变化是CME起始的常见特征,且可用于定位CME源区,为相关模型提供了观测支持。

摘要:

日冕物质抛射(CMEs)是涉及活动区磁拓扑大尺度变化的太阳爆发事件。目前已有一系列基于极性反转线(PIL)上方扭曲或剪切磁场的CME起始模型。我们提供了观测证据,表明光球层极性反转线(PIL)处的拓扑变化是CME起始的关键组成部分,这与许多模型的推论一致。具体而言,我们研究了30次CME的起始过程,利用ARTop代码计算磁缠绕通量,以此探究光球层的拓扑变化。通过将缠绕特征的时间和位置与ALMANAC代码生成的CME观测结果进行匹配,我们证实这些特征确实与CME相关。因此,本研究不仅提供了光球层磁拓扑变化是CME起始常见特征的证据,我们的方法还能够确定活动区内CME的源区位置。

英文摘要:

Coronal mass ejections (CMEs) are solar eruptions that involve large-scale changes to the magnetic topology of an active region. There exists a range of models for CME onset which are based on twisted or sheared magnetic field above a polarity inversion line (PIL). We present observational evidence that topological changes at PILs, in the photosphere, form a key part of CME onset, as implied by many models. In particular, we study the onset of 30 CMEs and investigate topological changes in the photosphere by calculating the magnetic winding flux, using the \texttt{ARTop} code. By matching the times and locations of winding signatures with CME observations produced by the \texttt{ALMANAC} code, we confirm that these signatures are indeed associated with CMEs. Therefore, as well as presenting evidence that changes in magnetic topology at the photosphere are a common signature of CME onset, our approach also allows for the finding of the source location of a CME within an active region.

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。

↑