Stokes diagnostics of simulations of magnetoconvection of mixed-polarity quiet-Sun regions
Stokes diagnostics of simulations of magnetoconvection of mixed-polarity quiet-Sun regions
复制标题
混合极性安静太阳区域磁对流模拟的斯托克斯诊断
DOI：
10.1051/0004-6361:20052958
复制
发表时间：
2005
影响因子：
6.5
通讯作者：
A. Vögler
中科院分区：
文献类型：
--
作者：
E. Khomenko;S. Shelyag;S. Solanki;A. Vögler
利用真实的太阳磁对流模拟，包括光球层，研究了6301.5，6302.5，15648和15652A处Fe I塞曼敏感谱线的偏振。斯托克斯光谱合成在一系列的快照与混合极性的磁场，其平均无符号强度变化从= 10到140 G。讨论了空间分辨率和模拟箱中磁通量大小对轮廓形状、振幅和偏移的影响。合成的光谱显示出许多与在安静的太阳区域观察到的光谱相同的性质。特别是，模拟再现的宽度和深度的空间平均斯托克斯我配置文件，斯托克斯V配置文件的基本类和它们的振幅和面积的不对称性，以及丰富的不规则形状的斯托克斯V配置文件。结果表明，在互连网络中观测到的1.56μm谱线的振幅与20 G的“真实”平均无符号磁场强度一致。我们表明，观察使用这些和可见的线，在不同的看到条件下进行（例如，在不同的望远镜上同时进行观测）可能会导致在同一空间点观测到的两个光谱区域中的轮廓的不同不对称性，甚至相反的极性。
Realistic solar magneto-convection simulations including the photospheric layers are used to study the polarization of the Fe I Zeeman-sensitive spectral lines at 6301.5, 6302.5, 15 648 and 15 652 A. The Stokes spectra are synthesized in a series of snapshots with a mixed-polarity magnetic field whose average unsigned strength varies from = 10 to 140 G. The effects of spatial resolution and of the amount of magnetic flux in the simulation box on the profiles shapes, amplitudes and shifts are discussed. The synthetic spectra show many properties in common with those observed in quiet solar regions. In particular, the simulations reproduce the width and depth of spatially averaged Stokes I profiles, the basic classes of the Stokes V profiles and their amplitude and area asymmetries, as well as the abundance of the irregular-shaped Stokes V profiles. It is demonstrated that the amplitudes of the 1.56μm lines observed in the inter-network are consistent with a "true" average unsigned magnetic field strength of 20 G. We show that observations using these and visible lines, carried out under different seeing conditions (e.g., simultaneous observations at different telescopes), may result in different asymmetries and even opposite polarities of the profiles in the two spectral regions observed at the same spatial point.