Global simulation of observed substorm and storm features M C Fok, T E Moore (All at NASA Goddard Space Flight Center, Code 692, Greenbelt, MD 20771; (301)286-1083; email: fok@gsfc.nasa.gov) D C Delcourt (CETP, Saint-Maur-des-Fosses, France) The New Millennium Magnetosphere: Integrating Imaging, Discrete Observations, and Global Simulations, Sixth Huntsville Modeling Workshop, Guntersville, Alabama, 26-30 October 1998. The evolution of the inner plasma sheet and the ring current during substorms are simulated. A substorm cycle is treated by varying the Tsyganenko 89 magnetic field model from a dipole-like configuration to a tail-like configuration, and then collapsing the magnetosphere back to the initial stage. Strong cross-tail steady field is super imposed on the inductive electric field to represent a storm-time substorm and a weak field is applied to represent a non-storm substorm. Ion distributions on the nightside at12 earth radii (Re), during these two substorms, are obtained using a single-particle code to trace particle trajectories backward in time to their source regions. Significant flux dropout is found at the 12-Re nightside boundary during the growth phase while ion fluxes are largely enhanced during the substorm expansion. This substorm associated variation on particle intensity is more pronounced during the non-storm substorm than the storm-time substorm. The subsequent acceleration and transport of these boundary ions into the inner magnetosphere is modeled by a kinetic model of the ring current. A more robust ring current is formed during the storm-time substorm than the non-storm substorm. The simulation also generates many frequently observed features of substorm injections, such as the sudden appearance of hot plasma tailward from a sharply defined "injection boundary", the earthward, tailward and azimuthal expansion of this enhanced region, and the creation of characteristic ion dispersion patterns in the geosynchronous orbit. This work represents a success in global modeling by connecting the adiabatic inner magnetosphere and the non-adiabatic outer region using two different approaches. The signatures predicted by the model produce observable features on ground-based magnetometers, geosynchronous plasma measurements and energetic neutral atom imagers at high altitudes.