MAGNETIC FIELD AT MARS: PRELIMINARY RESULTS OF THE MARS GLOBAL SURVEYOR MISSION

M. H. Acuna, J. E. P. Connerney, P. J. Wasilewski, H. V. Frey, NASA Goddard Space Flight Center, Greenbelt, MD 20771; R. P. Lin, K. A. Anderson, C. W. Carlson, J. McFadden, D. W. Curtis, D. Mitchell, Space Science Lab., University of California, Berkeley, CA; H. Reme, A. Cros, J. L. Medale, C. Mazelle, J. A. Sauvaud, C. D’Uston, Centre d’Etude Spatiale des rayonnements, Toulouse, France; S. J. Bauer, University of Graz and Space Research Inst., Graz, Austria; P. Cloutier, Space Science Dept., Rice University, Houston, TX; M. Mayhew, National Science Foundation, Washington, DC; N. F. Ness, Bartol Research Inst., University of Delaware, Newark, DE.

SLOPES AND STOCHASTIC PROPERTIES OF THE NORTHERN HEMISPHERE OF MARS FROM MOLA ALTIMETRY

O. Aharonson 1 , M.T. Zuber 1,2 , G.A. Neumann 1 , D.E. Smith 2 , J.W. Head 3 , 1 Dept. of Earth, Atm. & Planet. Sci., MIT, Cambridge, MA 02139, 2 Lab. for Terr. Phys., NASA/Goddard Space Flight Center, Greenbelt, MD 20771, 3 Dept. of Geol. Sci., Brown University, Providence, RI 02912; oded@mit.edu.

THE RELATIONSHIP OF MOLA NORTHERN HEMISPHERE TOPOGRAPHY TO THE 6.1 MBAR ATMOSPHERIC PRESSURE SURFACE OF MARS

M. T. Zuber 1 and D. E. Smith 2 , 1 Dept. Earth, Atm. & Planet. Sci., MIT, Cambridge, MA 02139, 2 Lab. for Terrestrial Phys., NASA/Goddard Space Flight Center, Greenbelt, MD 20771.

MARTIAN IMPACT CRATER EJECTA TOPOGRAPHY AS MEASURED BY THE MARS ORBITER LASER ALTIMETER (MOLA)

J. B. Garvin 1 , and S. E. H. Sakimoto 2 , and J. J. Frawley 3 . 1 NASA's GSFC, Code 921, Greenbelt, MD 20771; USRA at the Geodynamics Branch, NASA’s GSFC, Greenbelt, MD 20771; 3 Herring Bay Geophysics and Hughes-STX at NASA's GSFC

MOLA TOPOGRAPHY AND THE ISIDIS BASIN: CONSTRAINTS ON BASIN CENTER AND RING DIAMETERS

H. V. Frey 1 , S. E. H. Sakimoto 2 , and J. H. Roark 3 , 1 Geodynamics Branch, Goddard Space Flight Center, Greenbelt, MD 20771, frey@denali.gsfc.nasa.gov, 2 USRA at the Geodynamics Branch, Goddard Space Flight Center, Greenbelt, MD 20771, sakimoto@denali.gsfc.nasa.gov, 3 Science Systems & Applications, Inc, Lanham, MD 20706, roark@denali.gsfc.nasa.gov. Topography (km)

A TALE OF TWO CRATERS: MOLA CONSTRAINTS ON TIMING OF THE FORMATION OF THE CRUSTAL DICHOTOMY BOUNDARY ZONE AND ITS ASSOCIATED TOPOGRAPHY ON MARS

H. V. Frey 1 , S. E. H. Saki-moto 2 , and J. H. Roark 3 , 1 Geodynamics Branch, Goddard Space Flight Center, Greenbelt, MD 20771, frey@denali.gsfc.nasa.gov, 2 USRA at the Geodynamics Branch, Goddard Space Flight Center, Greenbelt, MD 20771, sakimoto@denali.gsfc.nasa.gov, 3 Science Systems & Applications, Inc., Lanham, MD 20706, roark@denali.gsfc.nasa.gov.

ATMOSPHERIC OPACITY FROM MARS OBSERVER LASER ALTIMITER OBSERVATIONS

Anton B. Ivanov, Duane O. Muhleman, California Institute of Technology, Pasadena, CA, 91125, USA, anton@gps.caltech.edu.

MERIDIONAL AND SEASONAL DISTRIBUTIONS OF TRACE GASES IN THE LOWER AND MIDDLE ATMOSPHERE OF MARS

D. Moreau 1 , A. Marten 2 and Y. Biraud 2 , 1 Belgian Institute for Space Aeronomy, B-1180, Brus-sels, Belgium, moreau@bira-iasb.oma.be, 2 DESPA, Observatoire de Paris-Meudon, 92195, Meudon, France.

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