发表机构
Kislovodsk Mountain Astronomical Station of the Pulkovo observatory（普尔科沃天文台基斯洛沃茨克山地天文台）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
提出磁通量管非对称输运机制，通过经向流对尾随腿的夹带效应产生差分力矩，重现乔伊定律并生成极向场。
AI 中文摘要
我们提出了一种基于非对称磁通量管与近表面经向流相互作用的新太阳αω发电机情景。标准薄通量管模拟表明，较差自转的径向梯度（∂Ω/∂r > 0）打破了浮现Ω环的空间对称性。前导（西侧）腿几乎垂直，而尾随（东侧）腿被强烈拉伸并沿经度方向展平。在光球层浮现时，朝向极点的水平经向流对尾随腿的作用更有效，因为等离子体对磁通量管弧元的水动力夹带效率（“帆效应”）与磁通量管弧元的总空间长度成正比。这产生了一个差分力矩，驱动尾随太阳黑子向极地方向移动，而前导太阳黑子由于其紧凑的空间几何形状而保持锚定。我们的模型在双极分离为15°时，在纬度20°处产生约0.3°/天的倾斜角演化速率，重现了乔伊定律，而无需在上升阶段引入经典的科里奥利力驱动的扭转。
英文摘要
We present a new scenario for the solar $αω$-dynamo based on the interaction of asymmetric magnetic flux tubes with the near-surface meridional flow. Standard thin flux tube simulations indicate that the radial gradient of differential rotation ($\partialΩ/\partial r > 0$) breaks the spatial symmetry of emerging $Ω$-loops. The leading (western) leg becomes nearly vertical, while the trailing (eastern) leg is heavily stretched and flattens along the longitude. Upon emergence at the photosphere, the horizontal meridional flow toward the poles acts more efficiently on the trailing leg because the efficiency of the hydrodynamic entrainment by the plasma (the ``sail effect'') is directly proportional to the total spatial length of the magnetic flux tube arc elements. This creates a differential torque that drives the trailing sunspot poleward while the leading sunspot remains anchored due to its compact spatial geometry. Our model yields a tilt angle evolution rate of $\approx 0.3^\circ\,\mathrm{day}^{-1}$ at a latitude of $20^\circ$ for a bipolar separation of $15^\circ$, reproducing Joy's law without invoking the classical Coriolis-driven twist during the rise phase.
Comments8 pages, 3 figures, 1 table
