We present a self-similar circulation model for protostellar bipolar outflows. The model is axisymmetric and stationary, and now includes Poynting flux. An inflow/outflow pattern including collimation of high speed material and an infalling toroidal disc arises naturally. The model is now at a stage where synthetic CO spectra reproduce very well the observational features. The results strengthen the idea that the Poynting flux and the radiative heating are ultimately the energy sources driving the outflow. We also show time-dependent numerical models of MHD jets driven by different magneto-centrifugal launching mechanisms. Our initial conditions for the simulations were calculated by solving for transfield force balance in jets driven by disks with different properties. The cross sections of density, velocity, pressure and magnetic field from these models are then injected into a computational grid. Using a high order accurate MHD code we show that the propagation characteristics of jets driven by different classes of rotators can vary considerably in terms of shock dynamics, kinematics and morphology. Our results may provide a mean for distinguishing between different models of jet launching and collimation.
|Original language||English (US)|
|Journal||Star Formation 1999, Proceedings of Star Formation 1999, held in Nagoya, Japan, June 21 - 25, 1999, Editor: T. Nakamoto, Nobeyama Radio Observatory|
|State||Published - Dec 1 1999|