Nonlinearity in a dynamo

Details Nonlinearity in a dynamo Nonlinearity in a dynamo

2010-05-10

arxiv.org/abs/1005.1557v1

Physics

Fluid Dynamics

Accepted to Geophys. Astrophys. Fluid Dynam

Scientific paper

Using a rotating flat layer heated from below as an example, we consider effects which lead to stabilizing an exponentially growing magnetic field in magnetostrophic convection in transition from the kinematic dynamo to the full non-linear dynamo. We present estimates of the energy redistribution over the spectrum and helicity quenching by the magnetic field. We also study the alignment of the velocity and magnetic fields. These regimes are similar to those in planetary dynamo simulations.

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