具有环形磁场的非轴对称Rossby涡不稳定性
Nonaxisymmetric Rossby Vortex Instability with Toroidal Magnetic Fields in Radially Structured Disks
摘要：
我们研究了具有径向密度结构的差动旋转、可压缩磁化吸积盘中的全局非轴对称罗斯比涡旋不稳定性。平衡磁场被假定为只有环形分量。利用线性理论分析，我们表明，密度结构可以是不稳定的非轴对称模式。我们发现，对于我们所研究的磁场分布，磁场总是提供一个稳定的效果，不稳定的Rossby涡不稳定模式。我们讨论了这种稳定效应的物理机制。文中还详细讨论了不稳定模的阈值和性质。此外，我们提出了线性稳定性的结果时，磁盘是可压缩的全球磁旋转不稳定性。
英文摘要：
We investigate the global nonaxisymmetric Rossby vortex instability 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 Rossby vortex instability 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.
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