Magnetic shear-driven instability and turbulent mixing in magnetized protostellar disks

Abstract

Observations of protostellar disks indicate the presence of the magnetic field of thermal (or superthermal) strength. In such a strong magnetic field, many MHD instabilities responsible for turbulent transport of the angular momentum are suppressed. We consider the shear-driven instability that can occur in protostellar disks even if the field is superthermal. This instability is caused by the combined influence of shear and compressibility in a magnetized gas and can be an efficient mechanism to generate turbulence in disks. The typical growth time is of the order of several rotation periods.

8 pages, 6 figures, A&A to appear

References in corpus (19)

• Turbulence in Accretion Disks. Vorticity Generation and Angular Momentum Transport via the Global Baroclinic Instability
• Linear Analysis of the Hall Effect in Protostellar Disks
• Local Magnetohydrodynamical Models of Layered Accretion Disks
• The Balbus-Hawley instability in weakly ionised discs
• Hydrodynamic turbulence cannot transport angular momentum effectively in astrophysical disks
• Turbulent Mixing and the Dead Zone in Protostellar Disks
• The Effect of the Hall Term on the Nonlinear Evolution of the Magnetorotational Instability: II. Saturation Level and Critical Magnetic Reynolds Number
• On the relevance of subcritical hydrodynamic turbulence to accretion disk transport
• Direct magnetic field detection in the innermost regions of an accretion disc
• An hydrodynamic shear instability in stratified disks
• The Stability of Magnetized Rotating Plasmas with Superthermal Fields
• Baroclinic Vorticity Production in Protoplanetary Disks; Part II: Vortex Growth and Longevity
• Magnetorotational instability in protoplanetary discs
• Waves and Instabilities in Accretion Disks: MHD Spectroscopic Analysis
• Global accretion disk simulations of magneto-rotational instability
• The influence of the Hall effect on the global stability of cool protostellar disks
• Nonlinear Stability of Thin, Radially-Stratified Disks
• Hydromagnetic Instability in Differentially Rotating Flows
• Compressibility and local instabilities of differentially rotating magnetized gas

Cited by in corpus (2)

• Jets, disc-winds and oscillations in general relativistic, magnetically driven flows around black hole
• High-growth-rate magnetohydrodynamic instability in differentially rotating compressible flow