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首页> 外文期刊>The Astrophysical journal >THE HORIZONTAL INTERNETWORK MAGNETIC FIELD: NUMERICAL SIMULATIONS IN COMPARISON TO OBSERVATIONS WITH HINODE
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THE HORIZONTAL INTERNETWORK MAGNETIC FIELD: NUMERICAL SIMULATIONS IN COMPARISON TO OBSERVATIONS WITH HINODE

机译:水平网络磁场:与蛇形观测的数值模拟

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摘要

Observations with the Hinode space observatory led to the discovery of predominantly horizontal magnetic fields in the photosphere of the quiet internetwork region. Here we investigate realistic numerical simulations of the surface layers of the Sun with respect to horizontal magnetic fields and compute the corresponding polarimetric response in the Fe I 630 nm line pair. We find a local maximum in the mean strength of the horizontal field component at a height of around 500 km in the photosphere, where, depending on the initial state or the boundary condition, it surpasses the vertical component by a factor of 2.0 or 5.6. From the synthesized Stokes profiles, we derive a mean horizontal field component that is 1.6 or 4.3 times stronger than the vertical component, depending on the initial state or the boundary condition. This is a consequence of both the intrinsically stronger flux density of and the larger area occupied by the horizontal fields. We find that convective overshooting expels horizontal fields to the upper photosphere, making the Poynting flux positive in the photosphere, whereas the Poynting flux is negative in the convectively unstable layer below it.
机译:在Hinode空间天文台进行的观测导致在安静的互联网络区域的光层中发现了水平磁场。在这里,我们研究了太阳表面层相对于水平磁场的逼真的数值模拟,并计算了Fe I 630 nm线对中相应的极化响应。我们在光球中约500 km的高度处发现了水平场分量的平均强度的局部最大值,其中,根据初始状态或边界条件,它比垂直分量要大2.0或5.6倍。从合成的斯托克斯曲线中,我们得出的平均水平场分量是垂直分量的1.6倍或4.3倍,具体取决于初始状态或边界条件。这是水平场固有的更强的通量密度和更大的面积的结果。我们发现对流超调将水平场驱赶到上部光层,使光合有效面的珀因廷通量为正,而在其下方的对流不稳定层中泊因特通量为负。

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  • 来源
    《The Astrophysical journal》 |2008年第1期|85-88|共4页
  • 作者单位

    Kiepenheuer-Institut fuer Sonnenphysik, Schoeneckstrasse 6, D-79104 Freiburg, Germany;

    Kiepenheuer-Institut fuer Sonnenphysik, Schoeneckstrasse 6, D-79104 Freiburg, Germany;

    Physics and Astronomy Department, Michigan State University, East Lansing, MI 48824;

    Institute of Theoretical Astrophysics, P.O. Box 1029, Blindern, N-0316 Oslo, Norway;

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