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• W2035358698 abstract "Abstract We perform a local stability analysis of rotational flows in the presence of a constant vertical magnetic field and an azimuthal magnetic field with a general radial dependence. Employing the short-wavelength approximation we develop a unified framework for the investigation of the standard, helical and azimuthal version of the magnetorotational instability (MRI), as well as of current-driven kink-type instabilities. Considering the viscous and resistive setup, our main focus is on the case of small magnetic Prandtl numbers which applies e.g. to liquid-metal experiments but also to the colder parts of accretion disks. We show that the inductionless versions of MRI that were previously thought to be restricted to comparatively steep rotation profiles extend well to the Keplerian case if only the azimuthal field slightly deviates from its current-free (in the fluid) profile. We find an explicit criterion separating the pure azimuthal inductionless MRI from the regime where this instability is mixed with the Tayler instability. We further demonstrate that for particular parameter configurations the azimuthal MRI originates as a result of a dissipation-induced instability of Chandrasekhar’s equipartition solution of ideal magnetohydrodynamics." @default.
• W2035358698 created "2016-06-24" @default.
• W2035358698 creator A5010429413 @default.
• W2035358698 creator A5047814719 @default.
• W2035358698 creator A5068551715 @default.
• W2035358698 date "2014-11-12" @default.
• W2035358698 modified "2023-10-14" @default.
• W2035358698 title "Local instabilities in magnetized rotational flows: a short-wavelength approach" @default.
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• W2035358698 doi "https://doi.org/10.1017/jfm.2014.614" @default.
• W2035358698 hasPublicationYear "2014" @default.
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