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J. Y. Chaufray, F. Leblanc, J. L. Bertaux, E. Quemerais (Service d'Aeronomie du CNRS)
During limb observations obtained on 2004 and 2005, the SPICAM UV imaging spectrometer on Mars Epress [1] measured UV emissions from different components of the martian upper atmosphere resulting of the interaction with the EUV solar radiation during low solar activity. Currently more than 50 orbits have been dedicated to the study of the upper atmosphere covering more than 500 days , rougly ¾ martian year. By studying these limb spectra and comparing with Mariner 6, 7 and 9 data [2] it is possible to derive the role of the solar activity, solar zenith angle and solar longitude on these emissions. These emissions will provide us information on airglow excitation mechanisms active in the upper atmosphere as well as density and temperature profiles and maybe escaping processes. Spectra and firsts results obtained in the martian thermosphere and exosphere will be presented and implications will be discussed. [1] Bertaux J.L. et al (2000). The Study of the Martian Atmosphere from Top to Bottom with SPICAM Light on Mars Express. Planet. Space Sci. 48, 1303-1320 [2] Barth C.A. et al (1971). Mariner 6 and 7 Ultraviolet Spectrometer Experiment : Upper Atmosphere Data, J.G.R. 76, 2213-2227
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Bulletin of the American Astronomical Society, 37 #3
© 2004. The American Astronomical Soceity.