arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2203.09110astro-ph.SR
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由间歇小尺度磁重联引起的细丝通道长大

Grow-up of a Filament Channel by Intermittent Small-scale Magnetic Reconnection

H. T. Li, X. Cheng, J. H. Guo, X. L. Yan, L. F. Wang, Z. Zhong, C. Li, M. D. Ding

摘要:

灯丝通道(FC)是磁场主要与极性反转线对齐的等离子体体积,被认为是日冕物质抛射的爆发前结构。然而,FC是如何形成的证据仍然难以捉摸。在本文中,我们提出了一个详细的研究建立的FC,以了解其形成机制。利用云南天文台的新真空太阳望远镜、南京大学的光学和近红外太阳爆发跟踪仪以及太阳动力学观测站的AIA和HMI对FC的成长过程进行了研究。利用正则化的毕奥-萨伐尔定律(RBSL)和磁摩擦方法重建了有源区的非线性无力场(NLFFF),揭示了FC的三维(3D)磁场特性。我们发现,部分暗条物质迅速转移到由小尺度磁重联形成的较长磁场上,如点状Hα/EUV增亮和随后的双向流出喷流以及解扭运动所证明的。Hα/EUV爆发在同一位置重复出现,与通量抵消密切相关,通量抵消发生在两个小尺度相反极性之间,由剪切和会聚运动驱动。三维NLFFF模型揭示了重联发生在一个双曲线通量管,位于上方的磁通抵消网站和以下的FC。FC逐渐建立了一个扭曲的磁通绳通过一系列的小规模的重联事件,间歇性地发生在喷发之前。

英文摘要:

Filament channel (FC), a plasma volume where the magnetic field is primarily aligned with the polarity inversion line, is believed to be the pre-eruptive configuration of coronal mass ejections. Nevertheless, evidence for how the FC is formed is still elusive. In this paper, we present a detailed study on the build-up of a FC to understand its formation mechanism. The New Vacuum Solar Telescope of Yunnan Observatories and Optical and Near-Infrared Solar Eruption Tracer of Nanjing University, as well as the AIA and HMI on board Solar Dynamics Observatory are used to study the grow-up process of the FC. Furthermore, we reconstruct the non-linear force-free field (NLFFF) of the active region using the regularized Biot-Savart laws (RBSL) and magnetofrictional method to reveal three-dimension (3D) magnetic field properties of the FC. We find that partial filament materials are quickly transferred to longer magnetic field lines formed by small-scale magnetic reconnection, as evidenced by dot-like Hα/EUV brightenings and subsequent bidirectional outflow jets, as well as untwisting motions. The Hα/EUV bursts appear repeatedly at the same location and are closely associated with flux cancellation, which occurs between two small-scale opposite polarities and is driven by shearing and converging motions. The 3D NLFFF model reveals that the reconnection takes place in a hyperbolic flux tube that is located above the flux cancellation site and below the FC. The FC is gradually built up toward a twisted flux rope via series of small-scale reconnection events that occur intermittently prior to the eruption.

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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