arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1509.01792astro-ph.SR
收藏

爆发S型在触发平行大尺度准圆带耀斑中的作用

The Role of Erupting Sigmoid in Triggering a Flare with Parallel and Large-Scale Quasi-Circular Ribbons

Navin Chandra Joshi, Chang Liu, Xudong Sun, Haimin Wang, Tetsuya Magara, Y. -J. Moon

摘要:

在本文中,我们使用多波长数据集对2014年4月18日发生的有趣的S形形成,喷发和相关耀斑进行了观测和分析。我们讨论了触发耀斑,其中包括两个不同的带状物:平行的带状物以及一个大规模的准圆形带状物的乙状结肠爆发的可能作用。几个观测证据和非线性无力场外推的结果表明,存在一个大规模的扇脊型磁位形的S形躺在一个部分的扇圆顶。这一事件可以用以下两个阶段来解释。在耀斑爆发前阶段,我们通过扇穹下两组剪切场之间的系链切割重联观察到了S形的形成和出现。第二个阶段是主耀斑阶段,特征是S型爆发,随后的耀斑带有平行的带状物和一个准圆形带状物。我们提出了以下的主耀斑的多阶段连续重联方案。首先,栓系切割重连是负责的形成和喷发的乙状结肠结构。第二,在爆发S型的尾流中发生的重联在圆形极性反转线的两侧产生平行的耀斑带。第三,在日冕的较高位置,可能是由爆发的S型触发的零型重联,导致了一个大的准圆形带状物的形成。对于这种类型的耀斑,我们第一次提出了一个机制,由一个爆发的S形在一个大规模的扇脊型磁配置触发的双套带。

英文摘要:

In this paper, we present observations and analysis of an interesting sigmoid formation, eruption and the associated flare that occurred on 2014 April 18 using multi-wavelength data sets. We discuss the possible role of the sigmoid eruption in triggering the flare, which consists of two different set of ribbons: parallel ribbons as well as a large-scale quasi-circular ribbon. Several observational evidence and nonlinear force-free field extrapolation results show the existence of a large-scale fan-spine type magnetic configuration with a sigmoid lying under a section of the fan dome. The event can be explained with the following two phases. During the pre-flare phase, we observed the formation and appearance of sigmoid via tether-cutting reconnection between the two sets of sheared fields under the fan dome. The second, main flare phase, features the eruption of the sigmoid, the subsequent flare with parallel ribbons, and a quasi-circular ribbon. We propose the following multi-stage successive reconnections scenario for the main flare. First, tether-cutting reconnection is responsible for the formation and the eruption of the sigmoid structure. Second, the reconnection occurred in the wake of the erupting sigmoid produces the parallel flare ribbons on the both sides of the circular polarity inversion line. Third, the null-type reconnection higher in the corona, possibly triggered by the erupting sigmoid, leads to the formation of a large quasi-circular ribbon. For the first time we suggest a mechanism for this type of flare consisting of a double set of ribbons triggered by an erupting sigmoid in a large scale fan-spine type magnetic configuration.

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。

↑