WKB thresholds of standard, helical, and azimuthal magnetorotational instability

Oleg Kirillov, Frank Stefani

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


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
Original languageEnglish
Pages (from-to)233-234
JournalProceedings of the International Astronomical Union
Issue numberS290
Publication statusPublished - 21 Feb 2012


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