Influence of turbulence on the dynamo threshold

Details Influence of turbulence on the dynamo threshold Influence of turbulence on the dynamo threshold

2006-01-10

arxiv.org/abs/physics/0601062v1

Phys.Rev.Lett. 96 (2006) 204503

Physics

Fluid Dynamics

Scientific paper

10.1103/PhysRevLett.96.204503

We use direct and stochastic numerical simulations of the magnetohydrodynamic equations to explore the influence of turbulence on the dynamo threshold. In the spirit of the Kraichnan-Kazantsev model, we model the turbulence by a noise, with given amplitude, injection scale and correlation time. The addition of a stochastic noise to the mean velocity significantly alters the dynamo threshold. When the noise is at small (resp. large) scale, the dynamo threshold is decreased (resp. increased). For a large scale noise, a finite correlation time reinforces this effect.

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