HR: 0830h
AN: SH11C-1109    [PDF]
TI: Modulation Near the Termination Shock: Stochastic Particle Studies using an MHD Heliosphere
AU: * Ball, B M
EM: bball@cr1.pss.fit.edu
AF: Florida Institute of Technology, 150 West University Boulevard, Melbourne, FL 32901 United States
AU: Zhang, M
AF: Florida Institute of Technology, 150 West University Boulevard, Melbourne, FL 32901 United States
AU: Rassoul, H
AF: Florida Institute of Technology, 150 West University Boulevard, Melbourne, FL 32901 United States
AU: Linde, T
AF: University of Chicago, 5640 South Ellis Ave., Chicago, IL 60637 United States
AB: Voyager observations near the termination shock have shown strong modulation of cosmic ray flux. In a recent study using stochastic particle simulations we showed that particles may cross the shock multiple times, and as a result we can obtain modulation even in regions where there is no divergence in the velocity field. Here we apply this idea to an MHD model of the heliosphere, which includes a non spherical termination shock boundary and a heliosheath region where the velocity field divergence is not identically zero. We will show the relative contributions to modulation from several regions, including the pre-shock solar wind, the shock itself, and the heliosheath. Comparisons will also be made with Voyager data.
DE: 2104 Cosmic rays
DE: 2124 Heliopause and solar wind termination
DE: 7843 Numerical simulation studies
DE: 7859 Transport processes
SC: SPA - Solar and Heliospheric Physics [SH]
MN: 2003 Fall Meeting