arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2008.01284astro-ph.SR
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太阳黑子半影细丝侵入光桥和由此产生的重联喷流

Sunspot penumbral filaments intruding into a light bridge and the resultant reconnection jets

Y. J. Hou, T. Li, S. H. Zhong, S. H. Yang, Y. L. Guo, X. H. Li, J. Zhang, Y. Y. Xiang

摘要:

半影细丝和光桥是太阳黑子内部的重要结构,对于理解太阳黑子磁场和下面的磁对流的性质非常重要。我们调查了一个有趣的事件,几个半影灯丝侵入太阳黑子光桥的磁场的太阳黑子半影灯丝和光桥,以及它们之间的相互作用的更多的见解。研究了半影细丝侵入光桥和由此产生的喷流的发射、运动学和磁拓扑特征。在光桥的西侧,侵入的半影丝状体穿透到光桥两侧的本影中,同时还探测到两组喷流。射流共享相同的投影形态与侵入的长丝,并伴有间歇性的足点增亮。同时光谱成像观测提供了令人信服的证据,存在磁重联相关的加热和双向流动的喷流基地附近,并有助于测量矢量速度的喷流。此外,非线性无力场外推的结果显示,强大的和高度倾斜的磁场沿侵入半影细丝,一致以及从射流的矢量速度推导出的结果。因此,我们认为这些喷流可能是由光桥内的新兴场与侵入的细丝的近水平场之间的磁重联引起的。然后,它们沿着更强的暗条场向外喷射。我们的研究表明,光桥中的半影暗条场和出射场之间可能发生磁重联,并沿较强的暗条场产生喷流。这些结果进一步补充了对太阳黑子内部磁重联和动力学活动的研究。

英文摘要:

Penumbral filaments and light bridges are prominent structures inside sunspots and are important for understanding the nature of sunspot magnetic fields and magneto-convection underneath. We investigate an interesting event where several penumbral filaments intruded into a sunspot light bridge for more insights into magnetic fields of the sunspot penumbral filament and light bridge, as well as their interaction. The emission, kinematic, and magnetic topology characteristics of the penumbral filaments intruding into the light bridge and the resultant jets are studied. At the west part of the light bridge, the intruding penumbral filaments penetrated into the umbrae on both sides of the light bridge, and two groups of jets were also detected. The jets shared the same projected morphology with the intruding filaments and were accompanied by intermittent footpoint brightenings. Simultaneous spectral imaging observations provide convincing evidences for the presences of magnetic reconnection related heating and bidirectional flows near the jet bases and contribute to measuring vector velocities of the jets. Additionally, nonlinear force-free field extrapolation results reveal strong and highly inclined magnetic fields along the intruding penumbral filaments, consistent well with the results deduced from the vector velocities of the jets. Therefore, we propose that the jets could be caused by magnetic reconnections between emerging fields within the light bridge and the nearly horizontal fields of intruding filaments. They were then ejected outward along the stronger filaments fields. Our study indicates that magnetic reconnection could occur between the penumbral filament fields and emerging fields within light bridge and produce jets along the stronger filament fields. These results further complement the study of magnetic reconnection and dynamic activities within the sunspot.

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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