Evolution of aligned states within nonlinear dynamos

IF 1.1 4区地球科学 Q3 ASTRONOMY & ASTROPHYSICS

Geophysical and Astrophysical Fluid Dynamics Pub Date : 2019-07-04 DOI:10.1080/03091929.2019.1640876

D. Miller

引用次数: 0

Abstract

ABSTRACT The Archontis dynamo is a rare example of an MHD dynamo within which forcing drives a dynamo where the flow and magnetic fields are almost perfectly aligned and the energies are approximately equal. In this paper, I expand upon our knowledge of the dynamo by showing that the intermediate steady states of the kinetic and magnetic energies observed by Cameron and Galloway are not a necessary feature of aligned dynamos. Furthermore, I show that the steady state into which the flow and magnetic fields eventually evolve is remarkably robust to the addition of time dependence and asymmetry to the forcing.

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非线性发电机内排列状态的演化

Archontis发电机是一个罕见的例子，一个MHD发电机内，强迫驱动发电机，其中流和磁场几乎完全对齐，能量大致相等。在本文中，我扩展了我们对发电机的认识，表明由卡梅伦和加洛韦观察到的动能和磁能的中间稳定状态并不是排列发电机的必要特征。此外，我还表明，流场和磁场最终演化到的稳定状态，对于时间依赖性和不对称性的加入，是非常稳健的。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Geophysical and Astrophysical Fluid Dynamics 地学天文-地球化学与地球物理

CiteScore

3.10

自引率

0.00%

发文量

审稿时长

>12 weeks

期刊介绍： Geophysical and Astrophysical Fluid Dynamics exists for the publication of original research papers and short communications, occasional survey articles and conference reports on the fluid mechanics of the earth and planets, including oceans, atmospheres and interiors, and the fluid mechanics of the sun, stars and other astrophysical objects. In addition, their magnetohydrodynamic behaviours are investigated. Experimental, theoretical and numerical studies of rotating, stratified and convecting fluids of general interest to geophysicists and astrophysicists appear. Properly interpreted observational results are also published.