Saturation of Magnetorotational Instability through Magnetic Field Generation

Details Saturation of Magnetorotational Instability through Magnetic Field Generation Saturation of Magnetorotational Instability through Magnetic Field Generation

2009-04-20

arxiv.org/abs/0904.2941v1

Astrophys.J.698:233-241,2009

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

9 pages, 10 figures to appear in ApJ, Jun 2009, 10 v698

Scientific paper

10.1088/0004-637X/698/1/233

The saturation mechanism of Magneto-Rotational Instability (MRI) is examined through analytical quasilinear theory and through nonlinear computation of a single mode in a rotating disk. We find that large-scale magnetic field is generated through the alpha effect (the correlated product of velocity and magnetic field fluctuations) and causes the MRI mode to saturate. If the large-scale plasma flow is allowed to evolve, the mode can also saturate through its flow relaxation. In astrophysical plasmas, for which the flow cannot relax because of gravitational constraints, the mode saturates through field generation only.

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