Authors: Tyler Reese (University of Arizona) Joe Giacalone (University of Arizona)

The New Horizons mission is expected to cross the Solar Wind Termination Shock within the next few years. This event will present the first opportunity to measure the evolution of particle distributions across the termination shock since the Voyager missions. This work presents simulation results on the evolution of Helium pickup ions at and just downstream of the termination shock. The primary method is numerical integration of equations of motion in a realistic representation of the termination shock. Tracking the phase space states of test particles allows for a prediction of the Helium pickup ion energy distribution – an as of yet unmeasured quantity. Possible observational comparisons are shown.