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In this paper we explore the dynamics of radiative axisymmetric MHD jets athigh resolution using AMR methods. The goal of the study is to determine boththe dynamics and emission properties of such jets. To that end we haveimplemented microphysics enabling us to produce synthetic maps of H$\alpha$ and[S II]. The jets are pulsed either sinusoidally or randomly via atime-dependent ejection velocity which leads to a complicated structure ofinternal shocks and rarefactions as has been seen in previous simulations. Thehigh resolution of our simulations allows us to explore in great detail theeffect of pinch forces (due to the jet's toroidal magnetic field) within the"working surfaces" where pulses interact. We map the strong H$\alpha$ emissionmarking shock fronts and the strong [S II] emission inside cooling regionsbehind shocks as observed with high-resolution images of jets. We find thatpinch forces in the stronger field cases produce additional emission regionsalong the axis as compared with purely hydrodynamic runs. These simulations area first step to understanding the full 3-D emission properties of radiative MHDjets.

MHD Effects on Pulsed YSO Jets. I. 2.5-D Simulations