Competing local and non-local a-effects for a simplified flux transport dynamo model
Competing local and non-local a-effects for a simplified flux transport dynamo model
复制标题
简化通量输运发电机模型的局部和非局部 a 效应的竞争
DOI：
10.1111/j.1745-3933.2009.00732.x
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发表时间：
2009
期刊：
影响因子：
--
通讯作者：
Mann P
中科院分区：
文献类型：
--
作者：
Mann P
太阳磁场是由磁流体发电机维持的，一般认为强的环形磁场产生于太阳对流层下方的速跃层。通过α效应产生极向场的位置仍然是个问题。其中一个这样的位置是太阳表面，在那里双极磁区的衰变产生极向磁场;这被称为巴布科克-莱顿机制。另一个可能的位置是太阳对流区的底部。最近的工作着眼于太阳发电机表面和深层α效应之间的竞争。研究的α效应是局部效应。然而，通量输运发电机计算使用非局部极向源项，也就是说，它们作用在表面，但与对流区底部的环向场成比例。我们将讨论非定域竞争α效应对发电机方程的影响，以探索这类模型的有效性。我们还将包括纬向环流的影响。
The solar magnetic field is maintained by a hydromagnetic dynamo, and it is generally accepted that strong toroidal magnetic field is produced at the tachocline below the solar convection zone. The location of production of the poloidal field via the α-effect is still in question. One such location is the solar surface, where decay of bipolar magnetic regions produces poloidal magnetic field; this is known as the Babcock–Leighton mechanism. Another possible location is the base of the solar convection zone. Recent work has looked at the competition in the solar dynamo between surface and deep-seated α-effects. The α-effects studied were local effects. However, flux-transport dynamo calculations use non-local poloidal source terms, that is they act at the surface but are proportional to the toroidal field at the base of the convection zone. We will discuss the effects of non-local competing α-effects on the dynamo equations to explore the validity of this type of model. We will also include the effects of meridional circulation.