标题： 太阳耀斑低层太阳大气中能量释放的观测研究 显示英文标题

标题： Observational Investigation of Energy Release in the Lower Solar Atmosphere of a Solar Flare

摘要： 我们利用2014年6月12日由新太阳望远镜（NST/BBSO）和日震磁象仪（HMI/SDO）获得的M1级耀斑观测数据，研究太阳低层大气中的耀斑过程。主要目标是利用高分辨率光学观测和磁场测量来理解耀斑能量释放的触发机制及其在太阳低层大气（光球和色球）中的表现。我们分析了光学图像、HMI多普勒图和矢量磁像图，并使用非线性强迫磁流体力学场（NLFFF）外推法重建磁场拓扑结构。NLFFF建模揭示了磁通量管在磁极反转线（PIL）处的相互作用。这两个相互作用的磁通量管在NST的高分辨率宽带连续图像中表现为沿PIL的紧凑剪切拱。在PIL附近，NST的Hα观测显示了小尺度光球磁场拱的薄三带结构的形成。这些观测结果表明，主要的能量释放区域位于密集的色球中，在强电流集中于极性反转线的区域内等离子体部分电离。由两个相互作用的磁通量管形成的电流片沿PIL拉长时，可能会触发磁重联。 显示英文摘要

摘要： We study flare processes in the lower solar atmosphere using observational data for a M1-class flare of June 12, 2014, obtained by New Solar Telescope (NST/BBSO) and Helioseismic Magnetic Imager (HMI/SDO). The main goal is to understand triggers and manifestations of the flare energy release in the lower layers of the solar atmosphere (the photosphere and chromosphere) using high-resolution optical observations and magnetic field measurements. We analyze optical images, HMI Dopplergrams and vector magnetograms, and use Non-Linear Force-Free Field (NLFFF) extrapolations for reconstruction of the magnetic topology. The NLFFF modelling reveals interaction of oppositely directed magnetic flux-tubes in the PIL. These two interacting magnetic flux tubes are observed as a compact sheared arcade along the PIL in the high-resolution broad-band continuum images from NST. In the vicinity of the PIL, the NST H alpha observations reveal formation of a thin three-ribbon structure corresponding to the small-scale photospheric magnetic arcade. Presented observational results evidence in favor of location of the primary energy release site in the dense chromosphere where plasma is partially ionized in the region of strong electric currents concentrated near the polarity inversion line. Magnetic reconnection may be triggered by two interacting magnetic flux tubes with forming current sheet elongated along the PIL.