Nonaxisymmetric Rossby vortex instability with toroidal magnetic fields in structured disks
- Los Alamos National Laboratory
We investigate the global nonaxisymmetric Rossby vortex instability (RVI) in a differentially rotating, compressible magnetized accretion disk with radial density structures. Equilibrium magnetic fields are assumed to have only the toroidal component. Using linear theory analysis, we show that the density structure can be unstable to nonaxisymmetric modes. We find that, for the magnetic field profiles we have studied, magnetic fields always provide a stabilizing effect to the unstable RVI modes. We discuss the physical mechanism of this stabilizing effect. The threshold and properties of the unstable modes are also discussed in detail. In addition, we present linear stability results for the global magnetorotational instability when the disk is compressible.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC52-06NA25396
- OSTI ID:
- 962384
- Report Number(s):
- LA-UR-09-01725; LA-UR-09-1725; ASJOAB; TRN: US0903437
- Journal Information:
- The Astrophysical Journal, Vol. 702; ISSN 0004-637X
- Country of Publication:
- United States
- Language:
- English
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