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首页> 外文期刊>Anais da Academia Brasileira de Ciencias >A mean-field Babcock-Leighton solar dynamo model with long-term variability
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A mean-field Babcock-Leighton solar dynamo model with long-term variability

机译：具有长期可变性的平均场Babcock-Leighton太阳发电机模型

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摘要

Dynamo models relying on the Babcock-Leighton mechanism are successful in reproducing most of the solar magnetic field dynamical characteristics. However, considering that such models operate only above a lower magnetic field threshold, they do not provide an appropriate magnetic field regeneration process characterizing a self-sustainable dynamo. In this work we consider the existence of an additional α-effect to the Babcock-Leighton scenario in a mean-field axisymmetric kinematic numerical model. Both poloidal field regeneration mechanisms are treated with two different strength-limiting factors. Apart from the solar antisymmetric parity behavior, the main solar features are reproduced: cyclic polarity reversals, mid-latitudinal equatorward migration of strong toroidal field, poleward migration of polar surface radial fields, and the quadrature phase shift between both. Long-term variability of the solutions exhibits lenghty periods of minimum activity followed by posterior recovery, akin to the observed Maunder Minimum. Based on the analysis of the residual activity during periods of minimum activity, we suggest that these are caused by a predominance of theα-effect over the Babcock-Leighton mechanism in regenerating the poloidal field.
机译：依靠Babc​​ock-Leighton机制的Dynamo模型成功地再现了大多数太阳磁场动力学特征。但是，考虑到此类模型仅在较低的磁场阈值以上运行，因此它们无法提供表征自持发电机的适当磁场再生过程。在这项工作中，我们考虑在平均场轴对称运动学数值模型中，对Babcock-Leighton情景存在一个附加的α效应。两种极向场的再生机理都用两种不同的强度限制因素进行了处理。除了太阳的反对称奇偶性行为外，还再现了太阳的主要特征：循环极性反转，强环形场的中纬向赤道向偏移，极性表面径向场的向极向偏移以及两者之间的正交相移。溶液的长期可变性表现出很长的最小活性期，随后发生后恢复，类似于观察到的Maunder Minimum。根据对最低活动期间剩余活动的分析，我们认为这些是由α效应超过Babcock-Leighton机制在再生极向场中引起的。

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