Experimental evidence for non-axisymmetric magnetorotational instability in a rotating liquid metal exposed to an azimuthal magnetic field

Abstract

The azimuthal version of the magnetorotational instability (MRI) is a non-axisymmetric instability of a hydrodynamically stable differentially rotating flow under the influence of a purely or predominantly azimuthal magnetic field. It may be of considerable importance for destabilizing accretion disks, and plays a central role in the concept of the MRI dynamo. We report the results of a liquid metal Taylor-Couette experiment that shows the occurrence of an azimuthal MRI in the expected range of Hartmann numbers.

5 pages, 5 figures, accepted at Physical Review Letters

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• Destabilisation of hydrodynamically stable rotation laws by azimuthal magnetic fields
• A unifying picture of helical and azimuthal MRI, and the universal significance of the Liu limit

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• Observation of axisymmetric standard magnetorotational instability in the laboratory
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• Identification of a non-axisymmetric mode in laboratory experiments searching for standard magnetorotational instability
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• Zero net flux MRI-turbulence in disks $-$ sustenance scheme and magnetic Prandtl number dependence
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• Singular diffusionless limits of double-diffusive instabilities in magnetohydrodynamics
• Experimental investigation of the return flow instability in magnetic spherical Couette flow
• Generalised quasi-linear approximation of the HMRI
• Self-excitation in a helical liquid metal flow: The Riga dynamo experiments
• Two types of axisymmetric helical magnetorotational instability in rotating flows with positive shear
• Continuation and stability of rotating waves in the magnetized spherical Couette system: Secondary transitions and multistability
• Linking dissipation-induced instabilities with nonmodal growth: the case of helical magnetorotational instability
• Transport properties of the Azimuthal Magnetorotational Instability
• Diffusive MHD Instabilities: Beyond the Chandrasekhar Theorem
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• Sustained Turbulence in Differentially Rotating Magnetized Fluids at Low Magnetic Prandtl Number
• Nonaxisymmetric linear instability of cylindrical magnetohydrodynamic Taylor-Couette flow
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• Fully nonlinear mode competitions in magnetised Taylor-Couette flow
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• Quasi-two-dimensional nonlinear evolution of helical magnetorotational instability in a magnetized Taylor-Couette flow
• Nonaxisymmetric MHD instabilities of Chandrasekhar states in Taylor-Couette geometry
• Parametric Survey of Nonaxisymmetric Accretion Disk Instabilities: Magnetorotational Instability to Super-Alfvénic Rotational Instability
• Metamorphosis of helical magnetorotational instability in the presence axial electric current
• Analysis of azimuthal magnetorotational instability of rotating MHD flows and Tayler instability via an extended Hain-Lust equation
• Magnetic field dynamos and magnetically triggered flow instabilities
• Absolute versus convective helical magnetorotational instabilities in Taylor-Couette flows
• Laboratory modeling of MHD accretion disks
• The Multivariate Extension of the Lomb-Scargle Method
• Experimental Confirmation of the Standard Magnetorotational Instability Mechanism with a Spring-Mass Analogue
• Non-diffusive angular momentum transport in rotating $\mathbf{z}$-pinches
• Phase Slip Solutions in Magnetically Modulated Taylor-Couette Flow
• Laboratory experiments and numerical simulations on magnetic instabilities