SELF-CONSISTENT MEAN-FIELD ELECTRODYNAMICS OF TURBULENT DYNAMOS

被引：67

作者：

GRUZINOV, AV ^{[1
]}

DIAMOND, PH ^{[1
]}

机构：

[1] INST THEORET PHYS, SANTA BARBARA, CA USA

来源：

PHYSICS OF PLASMAS | 1995年 / 2卷 / 06期

关键词：

D O I：

10.1063/1.871495

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

A turbulent dynamo in a conducting fluid is accompanied by the generation of small-scale magnetic fields, which are much stronger than the mean dynamo-generated magnetic field. These small-scale fields modify the α effect in such a way as to stabilize the dynamo process, α= (α0+β0R·▽xR)/(1+R2), where α0, β0 are the standard kinematic dynamo parameters, and R is proportional to the mean magnetic field B0, R=B0/(4πρV2/Rm)1/2, ρ is the fluid density, V is the characteristic turbulent velocity, and Rm is the magnetic Reynolds number. The derivation of this formula is illustrated using a simple model - the turbulent dynamo for an asymmetrical top. © 1995 American Institute of Physics.

引用

页码：1941 / 1946

页数：6