Proton Aurora and Trapped Particle Substorm Dynamics Compared J.-M. Jahn, M. G. Henderson, T. J. Immel, S. B. Mende, G. D. Reeves, C. J. Pollock, R. Skoug, and M. F. Thomsen Global auroral imaging data have shown us that auroral substorms are highly dynamic, complex and structured events. Since they are the result of processes taking place along extended magnetic field lines, auroral displays have been called the "TV screen" for the magnetoshpere. With recent IMAGE energetic neutral atom (ENA) observations we can globally correlate the dynamics of precipitating proton auroral phenomena with the dynamics of non-precipitating ENA substorm phenomena, tying processes at different portions along magnetic field lines together. We present comparisons for FUV proton aurora and MENA medium energy ENA observations of isolated substorm events during the summer of 2001. Both techniques show expected increases of particle fluxes during the expansion phase. The proton auroral response is typically both quicker and stronger, with significant flux increases over short periods of time. The ENA response is typically slower and more gradual. In addition, enhanced flux levels will persist up to several hours, much longer than the by comparison short-lived auroral displays. While this represents a considerable difference in the time evolution of an event, the local time extent of precipitating and trapped particles tracks much more closely. _______________ To be presented at the 2002 Spring A.G.U. Meeting, Washington, D.C., U.S.A., 28-31 May 2002