0830h AN: P21F-06 TI: A new Model of the Solar Wind Interaction with the Mars Ionosphere AU: * Schoendorf, J EM: jackie.schoendorf@atk.com AF: ATK Mission Research, 589 West Hollist St., Nashua, NH 03062 United States AU: Siebert, K EM: keith.siebert@atk.com AF: ATK Mission Research, 589 West Hollist St., Nashua, NH 03062 United States AU: Mendillo, M EM: mendillo@bu.edu AF: Center for Space Physics, Boston University, Boston, MA 02215 United States AU: Withers, P EM: withers@bu.edu AF: Center for Space Physics, Boston University, Boston, MA 02215 United States AU: Wilson, J EM: jkwilson@bu.edu AF: Center for Space Physics, Boston University, Boston, MA 02215 United States AB: We introduce a new MHD model of the Mars atmosphere-ionosphere-solar wind system. The model is adapted from a terrestrial MHD model of the global ionosphere-thermosphere-magnetosphere system, and includes a chemistry set appropriate for Mars and the presence of crustal magnetic fields. We present first results of the solar wind interaction with the Mars ionosphere, including the effects of the crustal fields on ionopause height and bow shock location. DE: 2419 Ion chemistry and composition (0335) DE: 2459 Planetary ionospheres (5435, 5729, 6026, 6027, 6028) DE: 2753 Numerical modeling DE: 2780 Solar wind interactions with unmagnetized bodies DE: 2784 Solar wind/magnetosphere interactions SC: Planetary Sciences [P] MN: 2005 Joint Assembly