标题： 垂直和水平磁场不均匀性对磁敏Fe I线（525.02 nm）Stokes参数的影响 显示英文标题

标题： Influence of the vertical and horizontal magnetic field inhomogeneity on the Stokes parameters of the magnetically sensitive Fe I line 525.02 nm

摘要： 基于对Holweger-Müller模型大气的Stokes参数的计算，我们研究了Fe I 525.02 nm谱线对某些垂直和水平磁场不均匀性的敏感性。 当垂直梯度为-0.4 mT/km时（这是某些理论磁通管模型的典型值），在V轮廓峰中显示出明显的不对称性。 这种不对称性在纯纵向磁场中最为明显，并且在低宏湍流速度下更为显著。 对于非纵向场中的Q轮廓，也观察到类似的效果。 Fe I 525.02 nm谱线对混合极性的次望远镜磁场也很敏感，就像Stenflo在红外线中观测到的那样。 我们认为，小尺度磁通管中的Wilson凹陷使得在大于60-65度的日心角处强磁场区域不可见，因为它们被周围较弱磁场屏蔽。 显示英文摘要

摘要： Based on calculations of the Stokes parameters for the Holweger-Mliller model atmosphere, we study sensitivity of the Fe I 525.02 nm line to some kinds of vertical and horizontal magnetic field inhomogeneity. A noticeable asymmetry is shown to appear in the V profile peaks when the vertical gradient is -0.4 mT/km, which is typical of some theoretical flux tube models. The asymmetry is most pronounced in a pure longitudinal magnetic field and at a low macroturbulent velocity. A similar effect is observed for the Q profile in nonlongitudinal fields as well. The Fe I 525.02 nm line is sensitive also to subtelescopic fields of mixed polarity like those observed by Stenflo in IR lines. We argue that the Wilson depression in small-scale flux tubes renders strong-field areas invisible at heliocentric angles greater than 60--65 degrees, since they are screened by surroundings with weaker magnetic fields.