Electromagnetic streaming instabilities of magnetized accretion disks with strong collisional coupling of species

Abstract

Electromagnetic streaming instabilities of multicomponent collisional magnetized accretion disks are studied. Sufficiently ionized regions of the disk are explored where there is strong collisional coupling of neutral atoms with both ions and dust grains simultaneously. The steady state is investigated in detail and the azimuthal and radial background velocities of species are calculated. The azimuthal velocity of ions, dust grains, and neutrals is found to be less than the Keplerian velocity. The radial velocity of neutrals and dust grains is shown to be directed inward of the disk. The general solution for the perturbed velocities of species taking into account collisions and thermal pressure is obtained. The effect on the collisional frequencies, due to density perturbations of charged species and neutrals, is included. It is shown that dust grains can be involved in the fast electromagnetic perturbations induced by the ions and electrons through the strong collisions of these grains with neutrals that in turn have a strong collisional coupling with the ions. The dispersion relation for the vertical perturbations is derived and its unstable solutions due to different background velocities of ions and electrons are found. The growth rates of the streaming instabilities considered can be much larger than the Keplerian frequency.

33 pages, accepted for publication in "Astrophysical Journal"

References in corpus (19)

• Streaming Instabilities in Protoplanetary Disks
• Rossby Wave Instability of Keplerian Accretion Disks
• Turbulence in Accretion Disks. Vorticity Generation and Angular Momentum Transport via the Global Baroclinic Instability
• Linear Analysis of the Hall Effect in Protostellar Disks
• The conductivity of dense molecular gas
• Hot H2O Emission and Evidence for Turbulence in the Disk of a Young Star
• Direct magnetic field detection in the innermost regions of an accretion disc
• Simulations of dust-trapping vortices in protoplanetary discs
• Baroclinic Vorticity Production in Protoplanetary Disks; Part I: Vortex Formation
• The Ionization Fraction in Dense Molecular Gas II: Massive Cores
• Turbulent transport and its effect on the dead zone in protoplanetary discs
• Large dust grains in the inner region of circumstellar disks
• On the stratified dust distribution of the GG Tau circumbinary ring
• Sub-Alfvenic Non-Ideal MHD Turbulence Simulations with Ambipolar Diffusion: I. Turbulence Statistics
• Three-fluid plasmas in star formation I. Magneto-hydrodynamic equations
• Formation of Narrow Dust Rings in Circumstellar Debris Disks
• Turbulence in circumstellar disks
• Formation of Cosmic Dust Bunnies
• Dust rings and filaments around the isolated young star V1331 Cygni

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