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首页> 外文期刊>The Astrophysical journal >VERTICAL LORENTZ FORCE AND CROSS-FIELD CURRENTS IN THE PHOTOSPHERIC MAGNETIC FIELDS OF SOLAR ACTIVE REGIONS
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VERTICAL LORENTZ FORCE AND CROSS-FIELD CURRENTS IN THE PHOTOSPHERIC MAGNETIC FIELDS OF SOLAR ACTIVE REGIONS

机译：太阳活动区光球磁场中的垂直洛伦兹力和交叉场电流

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摘要

We demonstrate that the vertical Lorentz force and a corresponding lower limit of the cross-field electric current density can be calculated from vector magnetograms of solar active regions obtained at a single height in the solar atmosphere, provided that the vertical gradient of the magnetic field strength is known at this height. We use a predicted vertical magnetic field gradient derived from a previous analysis. By testing various force-free solutions, we find that the numerical accuracy of our method is satisfactory. Applying the method to active region photo-spheric vector magnetograms, we find vertical Lorentz forces ranging from several hundredths to a few tenths of the typical photospheric gravitational force, and typical cross-field current densities up to several times 10 mA m~(-2). The typical vertical current density is found to be 2-3 times smaller, on the order of 10-15 mA m~(-2). These differences are above the associated uncertainties. The values of the cross-field currents decrease in an averaged vector magnetogram, but the ratio of the cross-field to the vertical current density increases, also above the uncertainties. We conclude that the photospheric active region magnetic fields are not force-free, contrary to the conjectures of some recent studies.
机译：我们证明，只要磁场强度的垂直梯度，可以从在太阳大气中单个高度处获得的太阳活动区域的矢量磁图计算出垂直洛伦兹力和相应的跨场电流密度下限。在这个高度是众所周知的。我们使用从以前的分析得出的预测的垂直磁场梯度。通过测试各种无力解决方案，我们发现我们方法的数值精度令人满意。将该方法应用于活动区域光球矢量磁图，我们发现垂直的洛伦兹力为典型的光球重力的百分之几到十分之几，典型的跨场电流密度高达10 mA m〜（-2） ）。发现典型的垂直电流密度要小2-3倍，约为10-15 mA m〜（-2）。这些差异高于相关的不确定性。交叉磁场电流的值在平均矢量磁线图中会减小，但是交叉磁场与垂直电流密度之比也会增加，也超过了不确定性。我们得出的结论是，与一些近期研究的推测相反，光球活动区磁场并非没有力。

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