Nonaxisymmetric Rossby Vortex Instability with Toroidal Magnetic Fields in Radially Structured Disks - Astrophysics > Solar and Stellar AstrophysicsReport as inadecuate




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Abstract: We investigate the global nonaxisymmetric Rossby vortex instability in adifferentially rotating, compressible magnetized accretion disk with radialdensity structures. Equilibrium magnetic fields are assumed to have only thetoroidal component. Using linear theory analysis, we show that the densitystructure can be unstable to nonaxisymmetric modes. We find that, for themagnetic field profiles we have studied, magnetic fields always provide astabilizing effect to the unstable Rossby vortex instability modes. We discussthe physical mechanism of this stabilizing effect. The threshold and propertiesof the unstable modes are also discussed in detail. In addition, we presentlinear stability results for the global magnetorotational instability when thedisk is compressible.



Author: Cong Yu 1,2, Hui Li 2 1Yunnan Astronomical Observatory, 2 Los Alamos National Lab

Source: https://arxiv.org/



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