The influence of a-effect fluctuations and the shear-current effect upon the behaviour of solar mean-field dynamo models a-Effect fluctuations in a solar dynamo model
The influence of a-effect fluctuations and the shear-current effect upon the behaviour of solar mean-field dynamo models a-Effect fluctuations in a solar dynamo model
复制标题
a 效应涨落和剪切流效应对太阳平均场发电机模型行为的影响 太阳发电机模型中的 a 效应涨落
DOI：
10.1111/j.1365-2966.2010.17405.x
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发表时间：
2010
影响因子：
4.8
通讯作者：
Bushby P
中科院分区：
文献类型：
--
作者：
Bushby P
最近的数值和分析工作已经确定了平均场发电机作用的一个可能的新来源，这是由α效应的波动与大尺度剪切相互作用引起的。这一过程在平均感应方程中产生了一个新的源项。基本上，同一项来自剪流效应。本文研究了一个二维太阳发电机模型，在球面几何，与现实的大规模剪切的新的长期的后果。一般来说，我们发现新的源项导致发电机周期的增加，尽管这一点的细节主要取决于α效应（或剪切流项）波动的空间变化。当新项在发电机过程中起主导作用时，就会产生稳定的磁场。
Recent numerical and analytical work has identified a possible new source of mean-field dynamo action, caused by fluctuations in the α-effect interacting with a large-scale shear. This process gives rise to a new source term in the averaged induction equation. Essentially the same term arises from the shear-current effect. This paper investigates the consequences of the new term in a two-dimensional solar dynamo model, in spherical geometry, with a realistic large-scale shear. In general, it is found that the new source term leads to an increase in the dynamo cycle period, although the details of this depend crucially upon the spatial variation of the fluctuations in the α-effect (or the shear-current term). Steady magnetic fields are generated when the new term plays a dominant role in the dynamo process.