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arXiv 2602.00801astro-ph.SR
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日冕纤维的延伸及其三维数值重建用于磁结构

Elongation of a Solar Filament and its Three-Dimensional Numerical Reconstruction for Magnetic Structures

Kumaun University(库马恩大学);Nanjing University(南京大学);KU Leuven(荷语鲁汶大学);Observatoire de Paris, Université PSL(巴黎天文台,巴黎文理研究大学);Sorbonne Université(索邦大学);Université Paris Cité(巴黎西岱大学);University of Glasgow(格拉斯哥大学)

Garima Karki, Jinhan Guo, Brigitte Schmieder, Ramesh Chandra, Pascal Démoulin, Stefaan Poedts, Bernard Gelly

AI总结:

研究通过三维磁流体动力学重建揭示了日冕纤维延伸的磁结构演变及磁通抵消加热机制。

摘要:

静止纤维是太阳大气中的显著特征,其演变反映了日冕磁场对光球磁活动的响应。本文报告了2023年9月28日至29日观测到的静止纤维,旨在理解磁配置如何塑造其脚部并驱动其延伸。为此,使用THEMIS和IRIS分别提供的Hα和Mg II k的高分辨率光谱数据。为了跟踪纤维的变化,我们利用太阳动力学观测站(SDO)上的大气成像装配(AIA)和全球振荡网络小组(GONG)的长期数据。我们使用Hinode上的太阳光学望远镜(SOT)分析光球的纵向磁场,以及SDO/日震学和磁图成像仪(HMI)的数据。此外,我们还使用GONG Hα数据分析纤维中的纵向振荡。观测显示,寄生极性与抵消磁通在形成和重组纤维脚部以及延长纤维中起关键作用。使用矢量磁图的三维磁流体动力学重建揭示其磁配置演变为完整的磁通绳(FR),其在第二天的延伸与观测到的纤维生长一致。FR与周围几乎势能场由准分离层分隔,这些层又被电流层分隔。随着FR的增长,这些层在FR周围变得更加有序。此外,扩展纤维中的纵向振荡归因于底层亮斑中磁通抵消的加热。

英文摘要:

Quiescent filaments are prominent features of the solar atmosphere, and their evolution reflects the coronal magnetic field's response to photospheric magnetic activity. Here, we report on a quiescent filament observed from 2023 September 28-29, aiming to understand how the magnetic configuration shapes its feet and drives its extension. For this purpose, high-resolution spectral data in H$α$ and Mg II k are used from the Télescope Héliographique pour l'Etude du Magnétisme et des Instabilités Solaires (THEMIS) and the Interface Region Imaging Spectrograph (IRIS), respectively. To track changes in the filament, we utilise long-term data from the Atmospheric Imaging Assembly (AIA) on the Solar Dynamics Observatory (SDO) and from the Global Oscillation Network Group (GONG). We analyse the longitudinal magnetic field in the photosphere using the Solar Optical Telescope (SOT) onboard Hinode, as well as SDO/Helioseismic and Magnetic Imager (HMI) data. In addition to this, we use GONG H$α$ data to analyze the longitudinal oscillations in the filament. Observations show that parasitic polarities and canceling flux play a key role in forming and reorganizing the filament feet and in lengthening the filament. A 3D MHD reconstruction using vector magnetograms reveals that its magnetic configuration evolves into a full flux rope (FR), whose extension on the second day matches the observed filament growth. The FR is separated from the surrounding nearly potential field by quasi-separatrix layers, which in turn are separated by current layers. They get more organized around the FR as it is growing up. Moreover, the longitudinal oscillations in the extended filament are attributed to heating from flux cancellation in underlying bright points.

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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