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• W1977202011 abstract "Axisymmetric magnetorotational instability (MRI) in viscous accretion disks is investigated by linear analysis and two-dimensional nonlinear simulations. The linear growth of the viscous MRI is characterized by the Reynolds number defined as RMRI ≡ v2A/ν Ω , where vA is the Alfvén velocity, ν is the kinematic viscosity, and Ω is the angular velocity of the disk. Although the linear growth rate is suppressed considerably as the Reynolds number decreases, the nonlinear behavior is found to be almost independent of RMRI. At the nonlinear evolutionary stage, a two-channel flow continues growing and the Maxwell stress increases until the end of calculations even though the Reynolds number is much smaller than unity. A large portion of the injected energy to the system is converted to the magnetic energy. The gain rate of the thermal energy, on the other hand, is found to be much larger than the viscous heating rate. Nonlinear behavior of the MRI in the viscous regime and its difference from that in the highly resistive regime can be explained schematically by using the characteristics of the linear dispersion relation. Applying our results to the case with both the viscosity and resistivity, it is anticipated that the critical value of the Lundquist number SMRI ≡ v2A/η Ω for active turbulence depends on the magnetic Prandtl number SMRI ,c ∝ Pm1/2 in the regime of Pm ≫ 1 and remains constant when Pm ≪ 1, where Pm ≡ SMRI/RMRI = ν/η and η is the magnetic diffusivity." @default.
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• W1977202011 date "2008-12-20" @default.
• W1977202011 modified "2023-09-24" @default.
• W1977202011 title "Axisymmetric Magnetorotational Instability in Viscous Accretion Disks" @default.
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• W1977202011 doi "https://doi.org/10.1086/592601" @default.
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