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arXiv 1306.5194astro-ph.SR
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沿Hi-C激活区细丝观察到的反平行EUV流

Anti-parallel EUV flows observed along active region filament threads with Hi-C

Caroline E. Alexander, Robert W. Walsh, Stephane Regnier, Jonathan Cirtain, Amy R. Winebarger, Leon Golub, Ken Kobayashi, Simon Platt, Nick Mitchell, Kelly Korr… 展开作者

Caroline E. Alexander, Robert W. Walsh, Stephane Regnier, Jonathan Cirtain, Amy R. Winebarger, Leon Golub, Ken Kobayashi, Simon Platt, Nick Mitchell, Kelly Korreck, Bart DePontieu, Craig DeForest, Mark Weber, Alan Title, Sergey Kuzin

摘要:

等离子体流动的双折射/细丝已经观察了很多年,并保持有价值的线索,这些结构内的质量和能量平衡。这些流动的先前观测主要来自H-α和冷EUV线(例如,304 A),其中对突出螺纹尺寸的估计受到可用仪器的分辨率的限制。以前已经从这些冷等离子体观测中推断出了“反蒸汽”流的证据,但现在,这些流第一次直接沿着百万度日冕内的基本细丝(在193 A)成像。在这项工作中,我们提出了一个活跃的区域灯丝观察Hi-C表现出反平行流沿相邻的细丝线程的意见。提供了SDO/AIA和HMI的补充数据。Hi-C的超高空间和时间分辨率允许测量反平行流速(70-80 km/s),并给出单个股的可分辨厚度(0.8“+/-0.1”)的指示。使用EM位点分析估计等离子体流的温度分布为log T(K)= 5.45 +/- 0.10。我们发现,SDO/AIA不能清楚地观察到这些反平行流,也不能测量他们的速度或线程宽度,由于其较大的像素大小。我们认为,反平行/逆流流动可能是司空见惯的所有灯丝,目前没有观察到EUV由于目前的仪器空间分辨率。

英文摘要:

Plasma flows within prominences/filaments have been observed for many years and hold valuable clues concerning the mass and energy balance within these structures. Previous observations of these flows primarily come from H-alpha and cool EUV lines (e.g., 304A) where estimates of the size of the prominence threads has been limited by the resolution of the available instrumentation. Evidence of `counter-steaming' flows has previously been inferred from these cool plasma observations but now, for the first time, these flows have been directly imaged along fundamental filament threads within the million degree corona (at 193A). In this work we present observations of an active region filament observed with Hi-C that exhibits anti-parallel flows along adjacent filament threads. Complementary data from SDO/AIA and HMI are presented. The ultra-high spatial and temporal resolution of Hi-C allow the anti-parallel flow velocities to be measured (70-80 km/s) and gives an indication of the resolvable thickness of the individual strands (0.8'' +/- 0.1''). The temperature distribution of the plasma flows was estimated to be log T(K) = 5.45 +/- 0.10 using EM loci analysis. We find that SDO/AIA cannot clearly observe these anti-parallel flows nor measure their velocity or thread width due to its larger pixel size. We suggest that anti-parallel/counter-streaming flows are likely commonplace within all filaments and are currently not observed in EUV due to current instrument spatial resolution.

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。

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