Resistivity-Driven State Changes in Vertically Stratified Accretion Disks

John Hawley, Jacob Simon & Kris Beckwith
We investigate the effect of shear viscosity, ν, and Ohmic resistivity, η, on the magnetorotational instability (MRI) in vertically stratified accretion disks through a series of local simulations with the Athena code. First, we use a series of unstratified simulations to calibrate physical dissipation as a function of resolution and background field strength; the effect of the magnetic Prandtl number, Pm = ν/η, on the turbulence is captured by ∼32 grid zones per disk scale...
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