On the convergence of Magnetorotational turbulence in stratified isothermal shearing boxes

Abstract

We consider the problem of convergence in stratified isothermal shearing boxes with zero net magnetic flux. We present results with the highest resolution to-date--up to 200 grid-point per pressure scale height--that show no clear evidence of convergence. Rather, the Maxwell stresses continue to decrease with increasing resolution. We propose some possible scenarios to explain the lack of convergence based on multi-layer dynamo systems.

arXiv comment10 pages, 4 figures, accepted for publication in ApJ Letters

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• Radiation Driven Warping of Accretion Discs Due to X-ray Bursts
• Transport properties of Keplerian flows in extended local domains with no imposed field
• Magnetic Helicities and Dynamo Action in Magneto-rotationally Driven Turbulence
• Fully kinetic shearing-box simulations of magnetorotational turbulence in 2D and 3D. I. Pair plasmas