Astronomy and Astrophysics – Astrophysics – High Energy Astrophysical Phenomena
Scientific paper
2010-04-14
Monthly Notices Roy. Astron. Soc. 413, 901-907 (2011)
Astronomy and Astrophysics
Astrophysics
High Energy Astrophysical Phenomena
8 pages, 7 figures, published version. Version with higher resolution figures is available at http://www.helsinki.fi/~kapyla/p
Scientific paper
10.1111/j.1365-2966.2010.18184.x
Numerical simulations of the magnetorotational instability (MRI) with zero initial net flux in a non-stratified isothermal cubic domain are used to demonstrate the importance of magnetic boundary conditions.In fully periodic systems the level of turbulence generated by the MRI strongly decreases as the magnetic Prandtl number (Pm), which is the ratio of kinematic viscosity and magnetic diffusion, is decreased. No MRI or dynamo action below Pm=1 is found, agreeing with earlier investigations. Using vertical field conditions, which allow the generation of a net toroidal flux and magnetic helicity fluxes out of the system, the MRI is found to be excited in the range 0.1 < Pm < 10, and that the saturation level is independent of Pm. In the vertical field runs strong mean-field dynamo develops and helps to sustain the MRI.
Käpylä Petri J.
Korpi Maarit Johanna
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