新真空太阳望远镜观测到的静止暗条的细尺度结构和物质流
Fine-scale structures and material flows of quiescent filaments observed by New Vacuum Solar Telescope
摘要：
太阳暗条的小尺度结构和物质流动的研究对于理解太阳暗条的形成和平衡具有重要意义。利用新真空太阳望远镜（NVST）观测到的高分辨率Hα数据，我们分别于2013年9月29日和2012年11月2日在两个静止的丝状体中呈现了倒钩的结构和沿着穿过脊柱的螺纹的物质流动。在细丝倒钩的演化过程中，形成了多个平行的管状结构，这些结构的宽度在2.3 ~ 3.3 μ m之间，这些平行的管状结构合并在一起，伴随着材料从刺向倒钩流动。此外，倒钩和周围大气之间的边界非常整洁。发现在长丝的相邻丝中没有交替出现逆流流动。然而，大规模的片状逆流流动中的细丝检测。长丝的一个补片中的流动具有相同的方向，而相邻补片中的流动具有相反的方向。在暗条的脊上交替出现大小约为10弧秒的两个相反流的斑片。这些物质流的速度从5.6 km/s到15.0 km/s不等。在长丝的演变过程中，沿着长丝的线的材料流在约2小时14分钟内没有改变它们的方向。我们的结果证实了沿太阳暗条线存在一定宽度的大尺度逆流流，并且与暗条线有很好的共线关系。
英文摘要：
Study on the small-scale structures and material flows of solar quiescent filaments is very important for understanding the formation and equilibrium of solar filaments. Using the high resolution Hα data observed by the New Vacuum Solar Telescope (NVST), we present the structures of the barbs and the material flows along the threads across the spine in two quiescent filaments on 2013 September 29 and on 2012 November 2, respectively. During the evolution of the filament barb, several parallel tube-shaped structures formed and the width of the structures ranges from about 2.3 Mm to 3.3 Mm. The parallel tube-shaped structures merged together accompanied with the material flows from the spine to the barb. Moreover, the boundary between the barb and surrounding atmosphere is very neat. The counter-streaming flows were not found to appear alternately in the adjacent threads of the filament. However, the large-scale patchy counter-streaming flows are detected in the filament. The flows in one patch of the filament have the same direction and the flows in the adjacent patch have opposite directions. The patches of two opposite flows with a size of about ten arcseconds exhibited alternately along the spine of the filament. The velocity of these material flows ranges from 5.6 km/s to 15.0 km/s. The material flows along the threads of the filament did not change their direction for about two hours and fourteen minutes during the evolution of the filament. Our results confirm that the large-scale counter-streaming flows with the certain width along the threads of solar filaments exist and are well coaligned with the threads.
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