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arXiv 1010.2095astro-ph.SR
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再现黑子半影区净圆偏振的多波长观测的未梳反演

An uncombed inversion of multi-wavelength observations reproducing the Net Circular Polarization in a sunspots' penumbra

C. Beck

摘要:

我推导出一个几何模型的半影磁场拓扑结构从一个未梳的反演设置,旨在重现NCP的同时光谱在近红外(1.56亩)和可见光(630 nm)谱线。我用一个模型反演了五条光球线的光谱,这个模型模拟了垂直交错的磁场,它有两个组成部分,标记为背景场和流动通道。使用SIRGAUS代码将流动通道建模为具有高斯形状的背景场的扰动。然后将光学深度尺度中高斯扰动的位置和范围转换为几何高度尺度。我调查了在流动通道和背景场大气中的磁通量的相对量。未梳模型能够在光斑的边缘侧很好地再现NCP,而在中心侧较差; VIS线比近红外线更好地再现。Evershed流沿着靠近太阳表面的几乎水平的场线发生。与流动通道相关的磁通量构成半影中总磁通量的约20 - 50%。通过高斯扰动可获得的梯度对于在具有小的形成高度范围的IR线中完美再现NCP来说太小。观察到的NCP的两个特点,在中心侧VIS线的NCP的符号变化和在630.37nm的Ti线和1565.2nm的FeI线的本影周围的环形结构值得密切关注。与流动通道部件相关的大部分磁通量可以允许补充通量管图中的半影辐射损失。

英文摘要:

I derived a geometrical model of the penumbral magnetic field topology from an uncombed inversion setup that aimed at reproducing the NCP of simultaneous spectra in near-IR (1.56 mu) and VIS (630 nm) spectral lines. I inverted the spectra of five photospheric lines with a model that mimicked vertically interlaced magnetic fields with two components, labeled background field and flow channels. The flow channels were modeled as a perturbation of the background field with a Gaussian shape using the SIRGAUS code. The location and extension of the Gaussian perturbation in the optical depth scale was then converted to a geometrical height scale. I investigated the relative amount of magnetic flux in the flow channels and the background field atmosphere. The uncombed model is able to reproduce the NCP well on the limb side of the spot and worse on the center side; the VIS lines are better reproduced than the near-IR lines. The Evershed flow happens along nearly horizontal field lines close to the solar surface. The magnetic flux that is related to the flow channels makes up about 20-50% of the total magnetic flux in the penumbra. The gradients obtainable by a Gaussian perturbation are too small for a perfect reproduction of the NCP in the IR lines with their small formation height range. Two peculiarities of the observed NCP, a sign change of the NCP of the VIS lines on the center side and a ring structure around the umbra in the Ti line at 630.37nm and the FeI line at 1565.2nm deserve closer attention. The large fraction of magnetic flux related to the flow channel component could allow to replenish the penumbral radiative losses in the flux tube picture.

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