Small-scale turbulent dynamo

被引:84
作者
Chertkov, M [1 ]
Falkovich, G
Kolokolov, I
Vergassola, M
机构
[1] Princeton Univ, Dept Phys, Princeton, NJ 08544 USA
[2] Weizmann Inst Sci, IL-76100 Rehovot, Israel
[3] Budker Inst Nucl Phys, Novosibirsk 630090, Russia
[4] CNRS, Observ Cote dAzur, F-06304 Nice 4, France
关键词
D O I
10.1103/PhysRevLett.83.4065
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Kinematic dynamo theory is presented here for turbulent conductive fluids. We describe how inhomogeneous magnetic fluctuations are generated below the viscous scale of turbulence where the spatial smoothness of the velocity permits a systematic analysis of the Lagrangian path dynamics. We find analytically the moments and multipoint correlation functions of the magnetic field at small yet finite magnetic diffusivity. We show that the fil:ld is concentrated in long narrow strips and describe anomalous scalings and angular singularities of the multipoint correlation functions which are manifestations of the field's intermittency. The growth rate of the magnetic field in a typical realization is found to be half the difference of two Lyapunov exponents of the same sign.
引用
收藏
页码:4065 / 4068
页数:4
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