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We perform state-of-the-art, 3D, time-dependent simulations of magnetizeddisk winds, carried out to simulation scales of 60 Astronomical Units, in orderto confront optical HST observations of protostellar jets. We ``observe'' theoptical forbidden line emission produced by shocks within our simulated jetsand compare these with actual observations. Our simulations reproduce the richstructure of time varying jets, including jet rotation far from the source, aninner (up to 400 km/s) and outer (less than 100 km/s) component of the jet, andjet widths of up to 20 Astronomical Units in agreement with observed jets.These simulations when compared with the data are able to constrain disk windmodels. In particular, models featuring a disk magnetic field with a modestradial spatial variation across the disk are favored.

Confronting 3 Dimensional Time-dependent Jet Simulations with HST Observations