arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2101.03296astro-ph.SR
收藏

太阳暗条双层结构爆发前的分裂

Pre-eruption Splitting of the Double-Decker Structure in a Solar Filament

Hanya Pan, Rui Liu, Tingyu Gou, Bernhard Kliem, Yingna Su, Jun Chen, Yuming Wang

摘要:

太阳细丝经常部分爆发。虽然它们如何分裂仍然是一个谜,但分裂过程有可能揭示灯丝结构和喷发机制。在这里,我们调查了爆发前分裂的一个明显的单灯丝和随后的部分喷发2012年9月27日。其演变的特点是具有不同的动态三个阶段。在准静态阶段,分裂逐渐进行约1.5小时,上支以每秒几公里的速度上升,并显示出绕其轴的涡旋运动。在持续约10 min的前兆阶段,上支以每秒数十公里的速度上升,在其足点处开始发展一对共轭调光区域;随着涡旋运动变得混乱,上支的轴向南鞭打,这驱动了弧形EUV波前向类似方向传播。在爆发阶段,上支爆发的C3.7级双带耀斑的开始,而下支保持稳定。根据上支和下支的分离足点,我们认为爆发前暗条形成了由两个不同的磁通束组成的双层结构,其形成与极性反转线周围逐渐的磁通量抵消和会聚的光球流有关。

英文摘要:

Solar filaments often erupt partially. Although how they split remains elusive, the splitting process has the potential of revealing the filament structure and eruption mechanism. Here we investigate the pre-eruption splitting of an apparently single filament and its subsequent partial eruption on 2012 September 27. The evolution is characterized by three stages with distinct dynamics. During the quasi-static stage, the splitting proceeds gradually for about 1.5 hrs, with the upper branch rising at a few kilometers per second and displaying swirling motions about its axis. During the precursor stage that lasts for about 10 min, the upper branch rises at tens of kilometers per second, with a pair of conjugated dimming regions starting to develop at its footpoints; with the swirling motions turning chaotic, the axis of the upper branch whips southward, which drives an arc-shaped EUV front propagating in the similar direction. During the eruption stage, the upper branch erupts with the onset of a C3.7-class two-ribbon flare, while the lower branch remains stable. Judging from the well separated footpoints of the upper branch from those of the lower one, we suggest that the pre-eruption filament processes a double-decker structure composed of two distinct flux bundles, whose formation is associated with gradual magnetic flux cancellations and converging photospheric flows around the polarity inversion line.

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。

↑