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arXiv 1609.07698astro-ph.SR
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IRIS和SST/CRISP观测到的活动区爆炸事件

Explosive events in active region observed by IRIS and SST/CRISP

Z. Huang, M. S. Madjarska, E. M. Scullion, L. -D. Xia, J. G. Doyle, T. Ray

摘要:

过渡区爆炸事件的特征是在多普勒速度为50-150 km/s时具有增强翼的非高斯线剖面。它们被认为是太阳现象的标志,是日冕加热的主要贡献者之一。本研究的目的是调查的联系EE的动力学现象的过渡区和色球在一个活跃的区域。我们分析了同时采取的观测界面区域成像光谱仪(IRIS)在Si IV 1394线和狭缝颚(SJ)1400线的图像,和瑞典1米太阳望远镜(SST)的H $α$线。在SJ 1400射电图像中,共发现24个与小尺度环增亮有关的事件。只有四个事件在H $α$ -35 km/s和H $α$ +35 km/s图像中显示出对应的事件。其中两个代表了几个环的结合区的增亮,它们也与H $α$-35 km/s和H $α$ +35 km/s图像中的亮区(颗粒道)有关。16个是在H $α$图像中不显示任何可辨别的响应的一般环路增亮。六个EE表现为传播的环增亮,其中两个与H $α$ -35 km/s图像中清晰可见的暗喷流状特征有关。我们发现,在H $α$线的机翼上看到的具有类似喷流外观的色球事件可以在过渡区触发EEs,在这种情况下,IRIS Si IV 1394 Xe线轮廓被Fe II和Ni II产生的吸收分量播种。我们的研究表明,发生在活动区的EEs大多有上层色球/过渡区的起源。我们认为,小尺度过渡区环的编织所导致的磁重联是本文报道的EE的能量释放的可能机制之一。

英文摘要:

Transition-region explosive events (EEs) are characterized by non-Gaussian line profiles with enhanced wings at Doppler velocities of 50-150 km/s. They are believed to be the signature of solar phenomena that are one of the main contributors to coronal heating. The aim of this study is to investigate the link of EEs to dynamic phenomena in the transition region and chromosphere in an active region. We analyze observations simultaneously taken by the Interface Region Imaging Spectrograph (IRIS) in the Si IV 1394Å line and the slit-jaw (SJ) 1400Å images, and the Swedish 1-m Solar Telescope (SST) in the H$α$ line. In total 24 events were found. They are associated with small-scale loop brightenings in SJ 1400Å images. Only four events show a counterpart in the H$α$-35 km/s and H$α$+35 km/s images. Two of them represent brightenings in the conjunction region of several loops that are also related to a bright region (granular lane) in the H$α$-35km/s and H$α$+35 km/s images. Sixteen are general loop brightenings that do not show any discernible response in the H$α$ images. Six EEs appear as propagating loop brightenings, from which two are associated with dark jet-like features clearly seen in the H$α$-35 km/s images. We found that chromospheric events with jet-like appearance seen in the wings of the H$α$ line can trigger EEs in the transition region and in this case the IRIS Si IV 1394Å line profiles are seeded with absorption components resulting from Fe II and Ni II. Our study indicates that EEs occurring in active regions have mostly upper-chromosphere/transition-region origin. We suggest that magnetic reconnection resulting from the braidings of small-scale transition region loops is one of the possible mechanisms of energy release that are responsible for the EEs reported in this paper.

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