Generation of multiscale magnetic field by parity-invariant time-periodic flows

Details Generation of multiscale magnetic field by parity-invariant time-periodic flows Generation of multiscale magnetic field by parity-invariant time-periodic flows

2002-07-28

arxiv.org/abs/physics/0207112v3

Geophys. Astrophys. Fluid Dynamics, 97, 2003, 225-248

Physics

Fluid Dynamics

24 pages, 7 figures. This is the final version of the manuscript (1 reference added and linguistic corrections made). Accepted

Scientific paper

10.1080/0309192032000101676

We study generation of magnetic fields involving large spatial scales by time- and space-periodic small-scale parity-invariant flows. The anisotropic magnetic eddy diffusivity tensor is calculated by the standard procedure involving expansion of magnetic modes and their growth rates in power series in the scale ratio. Our simulations, conducted for flows with random harmonic composition and exponentially decaying energy spectra, demonstrate that enlargement of the spatial scale of magnetic field is beneficial for generation by time-periodic flows. However, they turn out, in general, to be less efficient dynamos, than steady flows.

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