Magnetic field correlations in a random flow with strong steady shear

Details Magnetic field correlations in a random flow with strong steady shear Magnetic field correlations in a random flow with strong steady shear

2010-10-28

arxiv.org/abs/1010.5904v1

Nonlinear Sciences

Chaotic Dynamics

Scientific paper

We analyze magnetic kinematic dynamo in a conducting fluid where the stationary shear flow is accompanied by relatively weak random velocity fluctuations. The diffusionless and diffusion regimes are described. The growth rates of the magnetic field moments are related to the statistical characteristics of the flow describing divergence of the Lagrangian trajectories. The magnetic field correlation functions are examined, we establish their growth rates and scaling behavior. General assertions are illustrated by explicit solution of the model where the velocity field is short-correlated in time.

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