过渡区谱线中的分子吸收
Molecular absorption in transition region spectral lines
摘要：
目的：我们目前的观察从界面区域成像光谱仪（IRIS）的吸收功能，从众多的冷原子和分子线内的Si IV过渡区线的配置文件。许多这样的谱线以前在太阳光谱中没有被探测到。方法：我们检查了2013年10月12日深曝光谱斑的光谱。我们观察到独特的吸收光谱的磁性元素，这是明亮的过渡区线发射和紫外连续谱。我们比较了吸收光谱与可能与荧光有关的发射光谱。结果：吸收特征需要一个人口低于5000 K的等离子体存在以上的过渡区。这种特殊的分层是一个极端偏离规范结构的色球日冕边界。冷物质与暗条或可辨别的日冕雨无关。这表明分子可能在小空间尺度上形成于太阳上层大气中，并为我们对太阳热结构的理解引入了新的复杂性。它为以前的数值研究提供了可信度，这些研究发现了色球层中冷气体袋升高的证据。
英文摘要：
Aims: We present observations from the Interface Region Imaging Spectrograph (IRIS) of absorption features from a multitude of cool atomic and molecular lines within the profiles of Si IV transition region lines. Many of these spectral lines have not previously been detected in solar spectra. Methods: We examined spectra taken from deep exposures of plage on 12 October 2013. We observed unique absorption spectra over a magnetic element which is bright in transition region line emission and the ultraviolet continuum. We compared the absorption spectra with emission spectra that is likely related to fluorescence. Results: The absorption features require a population of sub-5000 K plasma to exist above the transition region. This peculiar stratification is an extreme deviation from the canonical structure of the chromosphere-corona boundary . The cool material is not associated with a filament or discernible coronal rain. This suggests that molecules may form in the upper solar atmosphere on small spatial scales and introduces a new complexity into our understanding of solar thermal structure. It lends credence to previous numerical studies that found evidence for elevated pockets of cool gas in the chromosphere.
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