A first order analysis of variations of the limb darkening and the shapes for solar Fraunhofer lines
A first order analysis of variations of the limb darkening and the shapes for solar Fraunhofer lines
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临边变暗变化和太阳夫琅和费线形状的一阶分析
DOI：
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发表时间：
1972
期刊：
影响因子：
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通讯作者：
J. Brault
中科院分区：
文献类型：
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作者：
R. Athay;B. Lites;O. White;J. Brault
FeI线的新中心到边缘的测量显示了线轮廓和边缘变暗曲线的变化，这些变化似乎是许多其他太阳线的特征。在这里，我们寻求这些影响对大气模型的约束。我们发现，除了深度变化的源函数之外，我们还必须允许连续吸收系数与总吸收系数的比率在光球中部通过最小值。这样的效果是一致的向内增加的多普勒宽度和阻尼常数在上层光球和向内增加的电离铁和氢在低光球。
New center-to-limb measurements in FeI lines show changes in both the line profiles and the limb darkening curves that appear to be characteristic of many other solar lines. Here we seek the constraints placed on the atmospheric model by these effects. We find that in addition to a depth varying source function we must also allow the ratio of the continuous absorption coefficient to the total absorption coefficient to pass through a minimum in the mid-photosphere. Such an effect is consistent with inward increases of the Doppler width and damping constant in the upper photosphere and an inward increase of the ionization for both iron and hydrogen in the low photosphere.