On the Saturation of Astrophysical Dynamos: Numerical Experiments with the No-cosines flow

Details On the Saturation of Astrophysical Dynamos: Numerical Experiments with the No-cosines flow On the Saturation of Astrophysical Dynamos: Numerical Experiments with the No-cosines flow

2004-09-08

arxiv.org/abs/astro-ph/0409193v1

Astronomy and Astrophysics

Astrophysics

8 pages, 5 figures, submitted to the proceedings of "Space Climate 1" to be peer-reviewed to Solar Physics

Scientific paper

10.1007/s11207-005-5700-4

In the context of astrophysical dynamos we illustrate that the no-cosines flow, with zero mean helicity, can drive fast dynamo action and study the dynamo's mode of operation during both the linear and non-linear saturation regime: It turns out that in addition to a high growth rate in the linear regime, the dynamo saturates at a level significantly higher than normal turbulent dynamos, namely at exact equipartition when the magnetic Prandtl number is on the order of unity. Visualization of the magnetic and velocity fields at saturation will help us to understand some of the aspects of the non-linear dynamo problem.

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