A self-sustaining nonlinear dynamo process in Keplerian shear flows

Details A self-sustaining nonlinear dynamo process in Keplerian shear flows A self-sustaining nonlinear dynamo process in Keplerian shear flows

2007-05-19

arxiv.org/abs/0705.2814v1

Phys.Rev.Lett.98:254502,2007

Astronomy and Astrophysics

Astrophysics

4 pages, 7 figures, accepted for publication in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.98.254502

A three-dimensional nonlinear dynamo process is identified in rotating plane Couette flow in the Keplerian regime. It is analogous to the hydrodynamic self-sustaining process in non-rotating shear flows and relies on the magneto-rotational instability of a toroidal magnetic field. Steady nonlinear solutions are computed numerically for a wide range of magnetic Reynolds numbers but are restricted to low Reynolds numbers. This process may be important to explain the sustenance of coherent fields and turbulent motions in Keplerian accretion disks, where all its basic ingredients are present.

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