New Light on an Old Problem of the Cores of Solar Resonance Lines
New Light on an Old Problem of the Cores of Solar Resonance Lines
复制标题
关于太阳共振线核心这个老问题的新见解
作者：
P. Judge;L. Kleint;J. Leenaarts;A. Sukhorukov;J. Vial
我们重新审视了一个50年以上的老问题，深中央反转预测强太阳光谱线，在观测中看到的较小的反转。我们检查的数据和计算的共振线的H i，Mg II，和Ca II，自反转的核心，其中形成在上层色球层。基于3D模拟，以及数据的Mg II线的接口区域成像光谱仪（IRIS），我们认为，分辨率不在于在微观或宏观湍流极限的尺度上的速度场。宏观湍流被排除使用的光学细线形成在上层色球层的观察，并显示它将需要有不合理的特殊属性，以占关键的观察Mg二共振线从IRIS使命。因此，上层色球层中的“湍流”的力量可能比先前的分析推断的要低得多。相反，在3D计算中，水平辐射传递产生更平滑的源函数，平滑波长和空间中的强度梯度。这些影响在更强的线中增加。我们的工作将产生的后果，了解发病的过渡区，了解运动中的能量可用于加热日冕，并解释极化数据的汉勒效应应用到共振线配置文件。
We reexamine a 50+ yr old problem of deep central reversals predicted for strong solar spectral lines, in contrast to the smaller reversals seen in observations. We examine data and calculations for the resonance lines of H i, Mg ii, and Ca ii, the self-reversed cores of which form in the upper chromosphere. Based on 3D simulations, as well as data for the Mg ii lines from the Interface Region Imaging Spectrograph (IRIS), we argue that the resolution lies not in velocity fields on scales in either of the micro- or macroturbulent limits. Macroturbulence is ruled out using observations of optically thin lines formed in the upper chromosphere, and by showing that it would need to have unreasonably special properties to account for critical observations of the Mg ii resonance lines from the IRIS mission. The power in “turbulence” in the upper chromosphere may therefore be substantially lower than earlier analyses have inferred. Instead, in 3D calculations horizontal radiative transfer produces smoother source functions, smoothing out intensity gradients in wavelength and in space. These effects increase in stronger lines. Our work will have consequences for understanding the onset of the transition region, for understanding the energy in motions available for heating the corona, and for the interpretation of polarization data in terms of the Hanle effect applied to resonance line profiles.
日冕中 II 型骨针的影响：模拟和综合观测值
DOI：
10.3847/1538-4357/aac2ca
发表时间：
2018
期刊：
The Astrophysical Journal
影响因子：
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作者：
Martínez-Sykora, Juan;Pontieu, Bart De;Moortel, Ineke De;Hansteen, Viggo H.;Carlsson, Mats
通讯作者：
Carlsson, Mats