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Flux-Transport Dynamo with Strong Surface Diffusivity

机译：磁通传输发电机具有强大的表面扩散率

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The flux-transport dynamo model for the solar sunspot cycle is revised and is demonstrated by using the axisymmetric kinematic simulations. The flux-transport dynamo has succeeded to explain the general cyclic behaviors of the sunspots especially in the gradual shift of the sunspot toward the equator and the poleward migration of the surface magnetic field. It has been known, however, that previous models failed to avoid the strong polar surface field and the strong toroidal field at the base in the high latitude, both of which are not consistent with observations. With an additional intense diffusivity profile near the surface two problematic features can be avoided. The surface poloidal field generated by the α effect is transported down to the base of the convection zone not by the meridional flow but by the surface diffusion mainly in the mid-latitude. This prevents the concentration of the polar surface field and the amplification of the toroidal field at the high latitude. The condition to obtain the proper magnetic field strength near the pole is η_(surf) / u_0 > 2 × 10~9 cm, where η_(surf) and u_0 are the surface diffusivity and the meridional flow speed, respectively. We also do some parameter studies to ensure the importance of the surface strong diffusivity.
机译：用于太阳能太阳黑子周期通量传输发电机模型进行修正，并通过使用轴对称模拟的运动证实。磁通传输发电机已经成功解释黑子的一般循环行为特别是在向赤道和表面磁场的极向所述迁移黑子的逐步转变。然而，已经知道的是，以前的模型未能避免在高纬度，这两者都是不与观测相符基强极性表面场强环向场。随着近表面的两个问题特征的附加强烈扩散曲线是可以避免的。由α效应产生的表面极向场不被子午流而是由主要在中纬度表面扩散向下输送到对流区的底部。这防止了极性表面场的浓度和环形场的在高纬度的扩增。的条件，以获得适当的磁场强度附近的极是η_（冲浪）/ U_0> 2×10 -9厘米，其中η_（冲浪）和U_0分别是表面扩散率和子午流速度，。我们也做了一些参数研究，以确保表面扩散强劲的重要性。

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