FORMATION OF STATIONARY MHD OUTFLOWS FROM A DISK BY TIME-DEPENDENT SIMULATIONS

Authors:M.M. Romanova, G.V. Ustyugova, A.V. Koldoba, V.M. Chechetkin, and R.V.E. Lovelace

We report the discovery of a family of stationary magnetohydrodynamic (MHD) outflows from a disk found by time-dependent, axisymmetric MHD simulations. The initial poloidal magnetic field threading the disk was taken to be a tapered monopole field with field strength on the disk decreasing outwards to small values. At the disk surface matter  was given a small initial push with a speed less than the slow magnetosonic speed. In the simulations, the outflowing matter is observed to be accelerated by magnetic and centrifugal forces up to velocities in excess of the fast  magnetosonic speed and in excess of the escape speed.

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Last updated on 29.01.07