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arXiv 2001.11254astro-ph.SR
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高分辨率日冕成像仪能分辨日冕链吗?结果来自AR 12712

Is the High-Resolution Coronal Imager Resolving Coronal Strands? Results from AR 12712

Thomas Williams, Robert W. Walsh, Amy R. Winebarger, David H. Brooks, Jonathan W. Cirtain, Bart Depontieu, Leon Golub, Ken Kobayashi, David E. Mckenzie, Richard… 展开作者

Thomas Williams, Robert W. Walsh, Amy R. Winebarger, David H. Brooks, Jonathan W. Cirtain, Bart Depontieu, Leon Golub, Ken Kobayashi, David E. Mckenzie, Richard J. Morton, Hardi Peter, Laurel A. Rachmeler, Sabrina L. Savage, Paola Testa, Sanjiv K. Tiwari, Harry P. Warren, Benjamin J. Watkinson

摘要:

在第一次任务成功后,高分辨率日冕成像仪(Hi-C)于2018年5月29日从美国新墨西哥州白沙导弹靶场第三次发射(Hi-C 2.1)。在这种情况下,以约4s的节奏和0.129“/像素的板尺度捕获目标活性区域AR 12712的329秒的17.2nm数据。使用Hi-C 2.1捕获的数据和SDO/AIA 17.1 nm的共对准观测,我们研究了49个冠状链的宽度。我们寻找AIA未检测到的链内亚结构的证据,并进一步考虑这些链是否被Hi-C 2.1完全解析。借助多尺度高斯归一化(MGN),研究了来自低发射区域的条带,这些条带只能在较暗的底层苔藓的对比下可视化。在这些低发射链与来自目标活性区域内的较高发射区域的那些之间进行比较。发现Hi-C 2.1可以分辨小至~ 202 km的单个链,但更典型的链宽度为~ 513 km。对于低发射区的冕带,其宽度最有可能在388公里处比高发射区窄得多。这使得低发射日冕束低于SDO/AIA的分辨能力,突出了对具有Hi-C分辨能力的永久性太阳观测站的需求。

英文摘要:

Following the success of the first mission, the High-Resolution Coronal Imager (Hi-C) was launched for a third time (Hi-C 2.1) on 29th May 2018 from the White Sands Missile Range, NM, USA. On this occasion, 329 seconds of 17.2 nm data of target active region AR 12712 was captured with a cadence of ~4s, and a plate scale of 0.129''/pixel. Using data captured by Hi-C 2.1 and co-aligned observations from SDO/AIA 17.1 nm we investigate the widths of 49 coronal strands. We search for evidence of substructure within the strands that is not detected by AIA, and further consider whether these strands are fully resolved by Hi-C 2.1. With the aid of Multi-Scale Gaussian Normalization (MGN), strands from a region of low-emission that can only be visualized against the contrast of the darker, underlying moss are studied. A comparison is made between these low-emission strands with those from regions of higher emission within the target active region. It is found that Hi-C 2.1 can resolve individual strands as small as ~202km, though more typical strands widths seen are ~513km. For coronal strands within the region of low-emission, the most likely width is significantly narrower than the high-emission strands at ~388km. This places the low-emission coronal strands beneath the resolving capabilities of SDO/AIA, highlighting the need of a permanent solar observatory with the resolving power of Hi-C.

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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