Nonlinear α-effect in dynamo theory

被引：77

作者：

Field, GB

Blackman, EG

Chou, HS

机构：

[1] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA

[2] CALTECH, Theoret Astrophys Grp, Pasadena, CA 91125 USA

[3] Harvard Univ, Dept Astron, Cambridge, MA 02138 USA

来源：

ASTROPHYSICAL JOURNAL | 1999年 / 513卷 / 02期

关键词：

MHD; turbulence;

D O I：

10.1086/306877

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The standard two-scale theory of the dynamo coefficient alpha in incompressible isotropic helical MHD turbulence is extended to include nonlinear effects of (B) over bar, the large-scale magnetic field. We express alpha in terms of statistical quantities that can be calculated from numerical simulations of the case (B) over bar = 0. For large magnetic Reynolds numbers, our formula agrees approximately with that of Kraichnan but disagrees with that of Cattaneo & Hughes.

引用

页码：638 / 651

页数：14

共 37 条

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