Magnetically Driven Jets from Accretion Disks. III. 2.5‐dimensional Nonsteady Simulations for Thick Disk Case

Abstract

We present the results of 2.5-dimensional MHD simulations of jet formation by magnetic accretion disks in which both ejection and accretion of disk plasma are included self-consistently. Although the jets in nonsteady MHD simulations have often been described as transient phenomena resulting from a particular choice of initial conditions, we found that the characteristics of the nonsteady jets are very similar to those of steady jets : (1) The ejection point of the jet, which corresponds to the slow magnetosonic point in steady MHD jet theory, is determined by the e ective potential resulting from gravitational and centrifugal forces along a eld line. (2) The dependences of the velocity and mass outow rate (v z ) ( M 0 w ) on the initial magnetic eld strength are approximately