Angular Momentum Transport by Acoustic Modes Generated in the Boundary Layer II: MHD Simulations

摘要: We perform global unstratified 3D magnetohydrodynamic simulations of an astrophysical boundary layer (BL) -- interface region between accretion disk and a weakly magnetized accreting object such as white dwarf with the goal understanding effects magnetic field on BL. use cylindrical coordinates isothermal equation state investigate number initial geometries including toroidal, vertical, vertical zero net flux. Our setup consists Keplerian attached to non-rotating star. In previous work, we found that in hydrodynamical simulations, sound waves excited by shear BL were able efficiently transport angular momentum drive mass onto Here confirm MHD serve efficient means vicinity BL, despite magnetorotational instability (MRI) operating disk. particular, current due is at times larger than MRI. results suggest its phenomenon occurring through dissipation shocks. This point view quite different from standard picture local anomalous turbulent viscosity. addition transport, also study amplification within find indeed amplified but only factor few remains subthermal.