WKB thresholds of standard, helical, and azimuthal magnetorotational instability
WKB thresholds of standard, helical, and azimuthal magnetorotational instability
Kirillov O.; Stefani, F.
We consider rotating flows of an electrically conducting, viscous and resistive fluid in an external magnetic field with arbitrary combinations of axial and azimuthal components. Within the short-wavelength approximation, the local stability of the flow is studied with respect to perturbations of arbitrary azimuthal wavenumbers. In the limit of vanishing magnetic Prandtl number (Pm) we find that the maximum critical Rossby number (Ro) for the occurrence of the magnetorotational instability (MRI) is universally governed by the Liu limit which is below the value for Keplerian rotation.
Keywords: Magnetorotational instability; WKB approximation; accretion disks
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Proceedings of the International Astronomical Union 8(2013), 233-234
DOI: 10.1017/S1743921312019771
Cited 7 times in Scopus
Permalink: https://www.hzdr.de/publications/Publ-18508
Publ.-Id: 18508