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arXiv 1609.05412astro-ph.SR
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一个太阳耀斑干扰了太阳黑子光桥上方的光墙

A solar flare disturbing a light wall above a sunspot light bridge

Yijun Hou, Jun Zhang, Ting Li, Shuhong Yang, Leping Li, Xiaohong Li

摘要:

利用界面区成像光谱仪的高分辨率数据,我们在NOAA活动区(AR)12403的太阳黑子光桥上方探测到一个光墙。在1330 A裂隙图像中,光墙比周围区域更亮,而墙顶和墙底比墙身更亮,并且它在光桥上方保持振荡。2015年8月28日02:52 UT时,该AR发生了一次由暗条激活引起的C8.0耀斑,耀斑的一条带状物与光桥重叠,光桥是光墙的观测基础。因此,光壁的振荡明显受到干扰。耀斑前光壁的平均投影振幅从0.5 μ m增加到1.6 μ m,耀斑后下降到0.6 μ m。我们认为,光壁与耀斑环共用一组磁场,经历了磁重联过程,构成了一个耦合系统。在耀斑前阶段,当磁场线被向上推时,光墙转向垂直方向,导致光墙投影振荡幅度增大。磁重联发生后,在重联点下方形成一组新的尺度较小的磁力线,轻壁发生倾斜。因此,在耀斑后阶段,投射振幅显著降低。

英文摘要:

With the high-resolution data from the Interface Region Imaging Spectrograph, we detect a light wall above a sunspot light bridge in the NOAA active region (AR) 12403. In the 1330 A slit-jaw images, the light wall is brighter than the ambient areas while the wall top and base are much brighter than the wall body, and it keeps oscillating above the light bridge. A C8.0 flare caused by a filament activation occurred in this AR with the peak at 02:52 UT on 2015 August 28, and the flare's one ribbon overlapped the light bridge which was the observational base of the light wall. Consequently, the oscillation of the light wall was evidently disturbed. The mean projective oscillation amplitude of the light wall increased from 0.5 Mm to 1.6 Mm before the flare, and decreased to 0.6 Mm after the flare. We suggest that the light wall shares a group of magnetic field lines with the flare loops, which undergo a magnetic reconnection process, and they constitute a coupled system. When the magnetic field lines are pushed upwards at the pre-flare stage, the light wall turns to the vertical direction, resulting in the increase of the light wall's projective oscillation amplitude. After the magnetic reconnection takes place, a group of new field lines with smaller scales are formed underneath the reconnection site and the light wall inclines. Thus, the projective amplitude decreases remarkably at the post-flare stage.

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