Previous work utilising NASA's High-resolution Coronal Imager (Hi-C 2.1) 17.2 nm observations revealed that, even at the increased spatial scales available in the data-set, there may be evidence for coronal structures that are still not fully resolved. In this follow-up study, cross-section slices of coronal strands are taken across the Hi-C 2.1 field-of-view. Following previous loop width studies, the background emission is removed to isolate the coronal strands. The resulting intensity variations are reproduced by simultaneously fitting multiple Gaussian profiles using a non-linear least-squares curve fitting method. In total, 183 Gaussian profiles are examined for possible structures that are hinted at in the data. The full width at half maximum (FWHM) is determined for each Gaussian, which are then collated and analysed. The most frequent structural widths are $\approx$450-575 km with 47% of the strand widths beneath NASA's Solar Dynamics Observatory Atmospheric Imaging Assembly (AIA) resolving scale (600-1000 km). Only 17% reside beneath an AIA pixel width (435 km) with just 6% of the strands at the Hi-C 2.1 resolving scale ($\approx$220-340 km). These results suggest that non-Gaussian shaped cross-sectional emission profiles observed by Hi-C 2.1 are the result of multiple strands along the integrated line-of-sight that can be resolved, rather than being the result of even finer sub-resolution elements.

中文翻译：

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横截面发射剖面中多条隐藏日冕链的证据和分析：美国宇航局高分辨率太阳日冕成像仪的进一步结果

之前利用 NASA 高分辨率日冕成像仪 (Hi-C 2.1) 17.2 nm 观测的工作表明，即使在数据集中可用的空间尺度增加的情况下，也可能有证据表明日冕结构仍未完全解析。在这项后续研究中，冠状股的横截面切片是在 Hi-C 2.1 视野中拍摄的。在先前的环宽度研究之后，去除背景发射以隔离冠状束。通过使用非线性最小二乘曲线拟合方法同时拟合多个高斯分布来再现产生的强度变化。总共检查了 183 个高斯分布，以寻找数据中暗示的可能结构。确定每个高斯的半峰全宽 (FWHM)，然后对其进行整理和分析。最常见的结构宽度约为 450-575 公里，其中 47% 的宽度低于美国宇航局太阳动力学天文台大气成像组件 (AIA) 分辨率（600-1000 公里）。只有 17% 位于 AIA 像素宽度（435 公里）之下，只有 6% 的股线处于 Hi-C 2.1 分辨率（约 220-340 公里）。这些结果表明，Hi-C 2.1 观察到的非高斯形横截面发射剖面是沿可分辨的集成视线的多条链的结果，而不是更精细的亚分辨率元素的结果. 只有 17% 位于 AIA 像素宽度（435 公里）之下，只有 6% 的股线处于 Hi-C 2.1 分辨率（约 220-340 公里）。这些结果表明，Hi-C 2.1 观察到的非高斯形横截面发射剖面是沿可分辨的集成视线的多条链的结果，而不是更精细的亚分辨率元素的结果. 只有 17% 位于 AIA 像素宽度（435 公里）之下，只有 6% 的股线处于 Hi-C 2.1 分辨率（约 220-340 公里）。这些结果表明，Hi-C 2.1 观察到的非高斯形横截面发射剖面是沿可分辨的集成视线的多条链的结果，而不是更精细的亚分辨率元素的结果.