DYNAMIC MODELING OF TRAPPED-PARTICLES

Understanding the dynamics of trapped particles is not simple, because storms are different and not too many satellites are orbiting at the same time with detectors aboard, In the past, general considerations h ave been made about radial diffusion, sources, and losses but at prese nt, due to the increasing power of computers, new codes can help under stand what is really happening to particles during storm periods in th e trapped region, physical considerations about four different codes a re presented here. The applications of full trajectory codes, codes us ing Guiding Center Approximation, three-dimensional diffusion codes, a nd four-dimensional diffusive-convective codes are given. In the near future, with some of these codes, it seems that a step will be passed in the modeling and comprehension of the physical phenomena occurring during such periods, We then will be able to identify the different ki nds of storms and their implications on trapped particles, and maybe m ake some predictions on the fluxes encountered by the satellites in th e internal magnetosphere region.