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arXiv 0708.2131astro-ph
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关于双峰太阳发电机的可能性

On the possibility of a bimodal solar dynamo

K. Petrovay

摘要:

本文提出了一种将界面发电机模型与快速速跃层模型耦合的简单方法,假定发电机饱和是一个二次过程,有限剪切层厚度对发电机波频率的影响类似于有限水深对表面重力波的影响。该模型包含一个自由参数,这是固定的要求,解决方案应重现日震确定的厚度的速跃层。在这种情况下,它被发现,除了这个解决方案,另一个稳定的解决方案存在,其特征是一个4倍厚的速跃层和4-5倍弱的磁场。人们很容易把第二个解的存在与太阳活动中的极小期联系起来。

英文摘要:

A simple way to couple an interface dynamo model to a fast tachocline model is presented, under the assumption that the dynamo saturation is due to a quadratic process and that the effect of finite shear layer thickness on the dynamo wave frequency is analoguous to the effect of finite water depth on surface gravity waves. The model contains one free parameter which is fixed by the requirement that a solution should reproduce the helioseismically determined thickness of the tachocline. In this case it is found that, in addition to this solution, another steady solution exists, characterized by a four times thicker tachocline and 4-5 times weaker magnetic fields. It is tempting to relate the existence of this second solution to the occurrence of grand minima in solar activity.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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