Pickup Ion Effect of the Solar Wind Interaction with the Local Interstellar Medium

yPickup ions are created when interstellar neutral atoms resonantly exchange charge with the solar wind (SW) ions, especially in the supersonic part of the wind, where they carry most of the plasma. pressure. Here we present numerical simulation results of the 311) heliospheric interface treating pickup ions as a separate proton fluid. To satisfy the fundamental conservation laws, we solve the system of equations describing the low of the mixture of electrons, thermal protons, and pickup ions. To frilld the density and pressure of pickup ions behind the termination shock, we employ simple boundary conditions that take into account the Voyager observations that showed that the decrease in the kinetic energy of the mixture at the termination shock predominantly contributed to the increase in the pressure of pickup ions. We show that this model adequately describes the flow of the plasma mixture and results in a noticeable decrease in the heliosheath width.