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Expansion of Magnetic Flux Concentrations with Height: A Comparison of Hinode SOT Data and MHD Simulations

机译:具有高度的磁通量浓度的扩展:Hinode SOT数据和MHD模拟的比较

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The Hinode SOT (Tsuneta et al. 2008) NFI Na I D_1 and SP Fe I data sampled at different positions on the solar disk provide a unique diagnos-tic for studying the expansion of magnetic flux concentrations with height. We make a comparative study of SOT observations and 2-dimensional (2D) radiative MHD-simulations to see how well the simulations capture the expansion prop-erties. The expansion of flux concentrations is clearly seen in the SOT Na I D, data, where most of the magnetic features appear unipolar at disk center while close to the limb bipolar appearance strongly dominates. This trend, albeit not as strong, is seen in the SP data as well. Some aspects of the observations are qualitatively reproduced by simulations with a potential (as opposed to vertical) upper boundary condition for the magnetic field.
机译:Hinode SOT(Tsuneta等人2008)NFI Na I D_1和SP FE I数据在太阳能盘上的不同位置采样提供了独特的诊断,用于研究具有高度的磁通量浓度的膨胀。我们对SOT观测和二维(2D)辐射MHD模拟进行了比较研究,以了解模拟捕获扩展支柱的程度。在SOT Na I D中清楚地看到通量浓度的扩展,数据,其中大部分磁性在磁盘中心出现单极性,同时靠近肢体双极外观强烈占主导地位。这一趋势尽管在SP数据中也不是强大的。观察结果的一些方面通过模拟与磁场的潜在(与垂直)上边界条件相反的模拟来定性再现。

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