2016/08/31 by Nakia Carlevaro, Giovanni Montani, Fabrizio Renzi · 1 citation
Mathematics · Physics and Astronomy · #Astrophysics and Star Formation Studies #Asymmetry #Classical mechanics #Compressibility #Geometry #Instability #Magnetic field #Mathematics #Mechanics #Perturbation (astronomy) #Physics #Plane (geometry) #Plasma #Pulsars and Gravitational Waves Research #Quantum mechanics #Solar and Space Plasma Dynamics #astro-ph.SR #physics.flu-dyn #physics.plasm-ph
paper · pdf · doi:10.1209/0295-5075/117/49001
published as Europhys. Lett. 117(4), 49001 (2017) · 7 pages, 4 figures
openalex publication_date 2017/02/01 · arxiv created 2017/04/03 · arxiv updated 2017/04/26 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We analyze the morphology of the magneto-rotational instability (MRI) for a stratified viscous plasma disk configuration in differential rotation, taking into account the so-called corotation theorem for the background profile. In order to select the intrinsic Alfvénic nature of MRI, we deal with an incompressible plasma and we adopt a formulation of the local perturbation analysis based on the use of the magnetic flux function as a dynamical variable. Our study outlines, as consequence of the corotation condition, a marked asymmetry of the MRI with respect to the equatorial plane, particularly evident in a complete damping of the instability over a positive critical height on the equatorial plane. We also emphasize how such a feature is already present (although less pronounced) even in the ideal case, restoring a dependence of the MRI on the stratified morphology of the gravitational field.