Abstract

A theory on the emergence of global hydrodynamic flows of matter and the generation of global magnetic fields in the solar convective zone is proposed. The unstable profile of differential rotation plays a crucial role in it: all hydrodynamic flows on the Sun (poloidal circulation, torsion oscillations, and spatiotemporal variations of the poloidal flow) are generated due to the loss of stability of differential rotation. None of the models known to us, wherein torsion oscillations and variations of the meridional circulation are typically calculated separately and are thus considered to be independent flows, reproduce this result. The calculations within our model suggest, on the contrary, that the indicated flows are actually toroidal and poloidal components of a single, 3-dimensional global flow. The decisive role of torsion oscillations in the generation of the radial alternating magnetic field is highlighted in the present study. It is demonstrated by numerical simulation that the time-varying radial magnetic field on the surface of the Sun reaches its maximum at the poles, where it changes polarity with a period of ~22 years. This process may be identified with the observed effect of polarity reversal of the polar field within the Hale magnetic cycle. It is demonstrated that the lines of zero values (polarity reversal) of the surface radial magnetic field pass through the maxima of the velocity modulus of zonal flows (torsion oscillations). In addition, the lines of magnetic polarity reversal of the radial field and the maximum velocities of surface zonal flows drift from the poles to the equator. It is noted that the obtained results on the latitudinal evolution of surface zonal flows correlate with the behavior of deep zonal flows determined by processing helioseismological data.

中文翻译：

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整体水动力流产生太阳的径向磁场

摘要

提出了一种关于物质整体水动力流的出现和太阳对流区整体磁场产生的理论。差速旋转的不稳定轮廓在其中起着至关重要的作用：由于差速旋转稳定性的损失，产生了太阳上的所有流体动力流（极环流，扭转振荡和时空变化的时空变化）。对于我们而言，其中扭转振动和子午循环变化通常无法单独计算并因此被认为是独立流动的任何模型，都无法再现此结果。相反，我们模型中的计算表明，指示的流量实际上是单个3维全局流量的环面和多面体分量。在本研究中强调了扭转振荡在径向交变磁场的产生中的决定性作用。数值模拟表明，太阳表面时变的径向磁场在两极达到最大，在两极期间它改变极性。该过程可以通过在黑尔磁循环中观察到的极性场极性反转的影响来识别。结果表明，表面径向磁场的零值线（极性反转）穿过纬向流速度模量的最大值（扭转振荡）。另外，径向磁场的磁极反转线和表面纬向流的最大速度从极点漂移到赤道。