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- W2964276021 abstract "We analyze the linear stability of an axially symmetric ideal plasma disk, embedded in a magnetic field and endowed with a differential rotation. This study is performed by adopting the magnetic flux function as the fundamental dynamical variable, in order to outline the role played by the corotation theorem on the linear mode structure. Using some specific assumptions (e.g., plasma incompressibility and propagation of the perturbations along the background magnetic field), we select the Alfvenic nature of the magnetorotational instability, and, in the geometric optics limit, we determine the dispersion relation describing the linear spectrum. We show how the implementation of the corotation theorem (valid for the background configuration) on the linear dynamics produces the cancellation of the vertical derivative of the disk angular velocity (we check such a feature also in the standard vector formalism to facilitate comparison with previous literature, in both the axisymmetric and three-dimensional cases). As a result, we clarify that the unstable modes have, for a stratified disk, the same morphology, proper of a thin-disk profile, and the z-dependence has a simple parametric role." @default.
- W2964276021 created "2019-07-30" @default.
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- W2964276021 date "2016-08-03" @default.
- W2964276021 modified "2023-10-18" @default.
- W2964276021 title "IMPLICATIONS OF THE COROTATION THEOREM ON THE MRI IN AXIAL SYMMETRY" @default.
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- W2964276021 doi "https://doi.org/10.3847/0004-637x/827/1/24" @default.
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