论文标题
通过磁反射和太阳差旋转的磁调节的角动量转运
Angular momentum transport by magnetoconvection and the magnetic modulation of the solar differential rotation
论文作者
论文摘要
为了解释活动最小值和最大值期间太阳旋转定律的方差，在旋转磁极注视中通过旋转的磁磁体传输的角动量在被倾斜的方位角磁场穿透的对流盒中模拟。湍流引起的动力应力和磁应力{和}大规模磁性背景场的洛伦兹力是角动量的基本转运蛋白。没有旋转，磁应力的迹象自然取决于场成分的符号，因为$ b_θb_ϕ $将角动量转移到极点（赤道）。然而，对于足够快的旋转，湍流注射的雷诺的应力开始主导角动量通量的运输。该模拟表明，两个子午磁场成分与方位角场的正比降低了由流体动力学计算导致的旋转磁反转，从而减少了内向径向和赤道纬度转运。仅对$ b_θb_ϕ> 0 $（由太阳能旋转定律与加速赤道生成）可在太阳能表面的磁性影响旋转相比，比非磁性轮廓和观察到的赤道轻微旋转。后一种现象并未出现在极性涡流的反极旋转以及旋转定律，并具有盛行的径向剪切。
In order to explain the variance of the solar rotation law during the activity minima and maxima, the angular momentum transport by rotating magnetoconvection is simulated in a convective box penetrated by an inclined azimuthal magnetic field. Turbulence-induced kinetic and magnetic stresses { and} the Lorentz force of the large-scale magnetic background field are the basic transporters of angular momentum. Without rotation, the sign of the magnetic stresses naturally depends on the signs of the field components as positive (negative) $B_θB_ϕ$ transport the angular momentum poleward (equatorward). For fast enough rotation, however, the turbulence-originated Reynolds stresses start to dominate the transport of the angular momentum flux. The simulations show that positive ratios of the two meridional magnetic field components to the azimuthal field reduce the inward radial as well as the equatorward latitudinal transport,%by the rotating magnetoconvection which result from hydrodynamic calculations. Only for $B_θB_ϕ>0$ (generated by solar-type rotation laws with an accelerated equator) does the magnetic-influenced rotation at the solar surface prove to be flatter than the nonmagnetic profile together with the observed slight spin-down of the equator. The latter phenomenon does not appear for antisolar rotation with polar vortex as well as for rotation laws with prevailing radial shear.
