The Propagation of Magnetocentrifugally Launched Jets. I.

We present simulations of the propagation of magnetized jets. This workdiffers from previous studies in that the cross-sectional distributions of thejets's state variables are derived from analytical models formagneto-centrifugal launching. The source is a magnetized rotator whoseproperties are specfied as boundary conditions. The jets in these simulationsare considerably more complex than the ``top-hat''constant density etc.profiles used in previous work. We find that density and magnetic fieldstratification (with radius) in the jet leads to new behavior including theseparation of an inner jet core from a low density collar. We find this {\itjet within a jet} structure, along with the magnetic stresses, leads topropagation behaviors not observed in previous simulation studies. Ourmethodology allows us to compare MHD jets from different types of sources whoseproperties could ultimately be derived from the behavior of the propagatingjets.Comment: 42 pages, accepted by the Ap