Energy partition of the heliospheric termination shock

We have examined energy dissipation via ion reflection and transmission at the heliospheric termination shock in the presence of pickup ions. Our simulations using the Los Alamos hybrid code show that transmitted pickup ions and the reflected solar wind ions carry the dominant pressures downstream of the shock. These results agree well with Voyager 2's observations of the termination shock crossing, which showed that populations other than the core solar wind must carry the majority of the downstream pressure. An analytical model for energy partition at the termination shock is developed. Results of the hybrid simulation strongly support the results of the analytic model. We go on to use the analytic model to predict the distributions that may be observed by the Interstellar Boundary Explorer Mission. Thus, we provide a theoretical framework to bridge Voyager 2 observations of the termination shock with energetic neutral atom observations from IBEX.