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• W3186019782 abstract "The evolution of a buoyancy disturbance in a stratified incompressible fluid permeated by a uniform vertical magnetic field is investigated. Two regimes are considered in the absence of background rotation – that of strong stratification, where the internal gravity wave frequency $omega _A$ is much higher in magnitude than the magnetic (Alfvén) wave frequency $omega _M$ , and that of strong magnetic field, where $omega _M$ is dominant. For small but finite magnetic diffusion, perturbations that initially lie in the strong-field regime are shown to cross over to the regime of strong stratification, so that small-scale motions may exist as damped internal gravity waves at large times. The induced magnetic field propagates as damped Alfvén waves for a much longer time than the velocity before undergoing the above transition. With strong rotation, the unstably stratified system that satisfies the inequality $|omega _C| > |omega _M| gg |omega _A| gg |omega _eta |$ , where $omega _C$ is the inertial wave frequency and $omega _eta$ is the diffusion frequency, is of relevance to convection-driven dynamos. Here, a parameter space with $|omega _M/omega _C| sim 0.1$ is found wherein the flow intensity of the slow magnetic-Archimedean-Coriolis (MAC) waves is of the same order of magnitude as that of the fast MAC waves. Slow wave motions at horizontal length scales much smaller than the width of the fluid layer can therefore generate substantial helicity in rapidly rotating dynamos. The excitation of slow MAC waves at scales of $sim$ 10 km in the Earth's core may play a crucial role in the generation of the axial dipole field." @default.
• W3186019782 created "2021-08-02" @default.
• W3186019782 creator A5051274935 @default.
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• W3186019782 date "2021-07-19" @default.
• W3186019782 modified "2023-10-01" @default.
• W3186019782 title "Evolution of forced magnetohydrodynamic waves in a stratified fluid" @default.
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• W3186019782 doi "https://doi.org/10.1017/jfm.2021.565" @default.
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