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We studied the magnetic field structures and dynamics of magnetizedmultiphase gas on parsec scales around supermassive black holes by using global3D magnetohydrodynamics (MHD) simulations. We considered the effect ofradiative cooling and X-ray heating due to active galactic nuclei (AGNs). Thegas disk consists of a multiphase gas with (1) cold ($\leq 10^3$ K) and thin,and (2) warm ($\sim 10^4$ K) and thick components with a wide range of numberdensities. The turbulent magnetic energy at maximum is comparable to thethermal and turbulent kinetic energies in the turbulent motion. We confirmedthat the turbulent velocity of the warm gas in the ambient cold gas is causedby magnetoconvective instability. The turbulent magnetic field due tomagnetorotational instability (MRI) is developed in the disk, but the meantoroidal magnetic field dominates and supports in a quasi-steady state, wherethe plasma-$\beta$, the ratio between gas pressure and magnetic pressure, islow ($\beta < 1$). As often seen in adiabatic MHD simulations of rotatingdisks, the direction of the mean toroidal field periodically reverses with timeeven in multiphase gas structures. The direction reversal is caused by magneticflux vertically escaping from the disk and by the combination of the MRI andthe Parker instability.

Multiphase Circumnuclear Gas in a Low-$\beta$ Disk: Turbulence and Magnetic Field Reversals