630~nm Fe I线对的Milne-Eddington反转
Milne-Eddington inversion of the Fe I line pair at 630~nm
摘要：
在630.15和630.25 nm处的铁谱线经常被用来确定太阳光球层的物理条件。一种常见的方法是在Milne-Eddington近似下同时反演它们。两条线采用相同的热力学参数，除了它们的不透明度，假设它们具有恒定的比率。我们的目的是调查这个假设的有效性，因为这两条线并不完全相同。我们使用磁流体动力学模拟安静的太阳检查的ME热力学参数的行为和它们的影响，检索矢量磁场和流速。我们的分析表明，这两条线可以耦合和反转同时使用相同的热力学参数和恒定的不透明度比。两条线的反演比单线反演精确得多，因为观测量的数量更多。
英文摘要：
The iron lines at 630.15 and 630.25 nm are often used to determine the physical conditions of the solar photosphere. A common approach is to invert them simultaneously under the Milne-Eddington approximation. The same thermodynamic parameters are employed for the two lines, except for their opacities, which are assumed to have a constant ratio. We aim at investigating the validity of this assumption, since the two lines are not exactly the same. We use magnetohydrodynamic simulations of the quiet Sun to examine the behavior of the ME thermodynamic parameters and their influence on the retrieval of vector magnetic fields and flow velocities. Our analysis shows that the two lines can be coupled and inverted simultaneously using the same thermodynamic parameters and a constant opacity ratio. The inversion of two lines is significantly more accurate than single-line inversions because of the larger number of observables.
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