We present observations of the solar chromosphere obtained simultaneously with the Atacama Large Millimeter/submillimeter Array (ALMA) and the Interface Region Imaging Spectrograph (IRIS). The observatories targeted a chromospheric plage region of which the spatial distribution (split between strongly and weakly magnetized regions) allowed the study of linear-like structures in isolation, free of contamination from background emission. Using these observations in conjunction with a radiative magnetohydrodynamic 2.5D model covering the upper convection zone all the way to the corona that considers non-equilibrium ionization effects, we report the detection of an on-disk chromospheric spicule with ALMA and confirm its multithermal nature.

中文翻译：

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ALMA 和 IRIS 对太阳色层的观测。I. 一种盘上 II 型骨针

我们展示了与阿塔卡马大型毫米/亚毫米阵列 (ALMA) 和界面区域成像光谱仪 (IRIS) 同时获得的太阳色球层观测结果。天文台瞄准了色球斑区域，该区域的空间分布（强磁化区域和弱磁化区域之间的分裂）允许孤立地研究线性状结构，不受背景辐射的污染。将这些观察结果与辐射磁流体动力学 2.5D 模型结合使用，该模型覆盖上对流区一直到考虑非平衡电离效应的日冕，我们报告了用 ALMA 检测到盘上色球针状体并确认其多热性质。