HR: 0800h
AN: P11A-0968    [Abstracts]
TI: Martian Shock and Magnetic Pile-up Boundary Positions and Shapes Determined from the Phobos 2 and Mars Global Surveyor Data sets
AU: * TROTIGNON, J
EM: Jean-Gabriel.Trotignon@cnrs-orleans.fr
AF: LPCE/CNRS, Universite d'Orleans, 3A, avenue de la Recherche Scientifique, Orleans cedex 02, F-45071 France
AU: MAZELLE, C
EM: Christian.Mazelle@cesr.fr
AF: CESR/CNRS, Universite Paul Sabatier de Toulouse, 9, avenue du Colonel Roche, BP 4346, Toulouse cedex 4, F-31028 France
AU: BERTUCCI, C
EM: c.bertucci@imperial.ac.uk
AF: The Blackett Laboratory, Space and Atmospheric Physics Group, Imperial College London, Prince Consort Road, London, SW7 2BZ United Kingdom
AU: Acuna, M
EM: mario.acuna@gsfc.nasa.gov
AF: NASA Goddard Space Flight Center, NASA/GSFC, Code 695, Greenbelt, MD MD 20771 United States
AB: A great many Martian bow shock and magnetic pile-up boundary crossings have been identified in the Phobos 2 and Mars Global Surveyor, MGS, data. From these observations the positions and shapes of the bow shock and magnetic pile-up boundary, MPB, have been derived and modelled, using curve-fitting techniques. The models thus derived separately from the Phobos 2 and MGS data sets do not differ drastically, despite the different time and space data coverages. The purpose of the presentation is therefore to show the results obtained from the mixing of the Phobos 2 and MGS data bases and to compare the derived bow shock and MPB models with the ones obtained previously. The underlying objective was to see whether it was possible to determine improved bow shock and MPB models or not. The answer is definitely yes, and particularly for the MPB, thanks to the complementary nature of the Phobos 2 and MGS observations. The boundaries crossed close to the subsolar direction or mostly far downstream by Phobos 2 indeed allow a better coverage of the Martian space environment to be considered. Nevertheless, in order to reduce the domination of the overabundant MGS data set and/or the crossings that are close to Mars, weighting factors have been introduced.
DE: 9800 GENERAL OR MISCELLANEOUS
SC: Planetary Sciences [P]
MN: 2004 AGU Fall Meeting