37th DPS Meeting, 4-9 September 2005
Session 32 Mars' Surface
Poster, Tuesday, September 6, 2005, 6:00-7:15pm, Music Recital Room

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[32.27] Observations of magnetic anomaly signatures in Mars Express ASPERA-3 ELS data

Y. S. Soobiah (Mullard Space Science Laboratory, University College London, Surrey), Southwest Research Institute Team, Swedish Institute of Space Physics Team, Finnish Meteorological Institute Team, Space Physics Research Laboratory, University of Michigan Team, Space Science Laboratory, University of California in Berkeley Team, Applied Physics Laboratory, Johns Hopkins University Team, Rutherford Appleton Laboratory Team, Centre d'Etude Spatiale des Rayonnements Team, Instituto di Fisica dello Spazio Interplanetari Team, Max-Planck-Institut fur Aeronomie Team, Institute of Space and Astronautical Science Team, Space Technology Ireland, National University of Ireland Team, University of Bern, Physikalisches Institut Team, Technical University of Braunschweig Team, University of Arizona, Tucson Team

Mars Express (MEX) ASPERA-3 data is providing insights into atmospheric loss on Mars via the solar wind interaction. This process is influenced by both the interplanetary magnetic field (IMF) in the solar wind and by the magnetic ``anomaly" regions of the Martian crust. We analyse observations from the ASPERA-3 Electron Spectrometer near to such crustal anomalies. We find that the electrons near remanent magnetic fields either increase in flux to form intensified signatures or significantly reduce in flux to form plasma voids. We suggest that cusps intervening neighbouring magnetic anomalies may provide a location for enhanced escape of planetary plasma. Initial statistical analysis shows that intensified signatures are mainly a dayside phenomenon whereas voids are a feature of the night hemisphere.

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Bulletin of the American Astronomical Society, 37 #3
© 2004. The American Astronomical Soceity.