Observing and modelling Mars' airglow

Details Observing and modelling Mars' airglow Observing and modelling Mars' airglow

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008epsc.conf..726s&link_type=abstract

European Planetary Science Congress 2008, Proceedings of the conference held 21-25 September, 2008 in Münster, Germany. Online a

Computer Science

Scientific paper

Abstract SPICAM is the UV spectrometer onboard ESA's Mars Express, which has been recording for more than four years upper atmospheric emissions ([1], [2]). 70000 dayglow limb spectra were analysed using an updated and variable point spread function, yielding altitude profiles of the Cameron bands (a3Π - X1Σ) of CO, the CO2 + ultraviolet doublet (B2Σu + - X2Πg) at 289 nm and the oxygen emission at 297.2 nm. The seasonal evolution of these emissions (Fig. 1) exhibits an unexpected increase around LS = 140 degrees, which is correlated with a sudden increase of neutral densities due to a dust storm event. A comparison with a newlydeveloped kinetic electron and airglow model ([3], [4]) yields promising results on emission altitude profiles. Improvements on the neutral atmosphere and cross sections are discussed. The new data analysis performed enables the search for faint emissions underlying the main Cameron emission bands. This comparison and analysis work is being extended to nightside auroral emissions using multi-instrument data on Mars Express. References [1] Bertaux, J.-L., Korablev, O., Perrier,S., Quémerais, E. and the SPICAM team (2006) JGR, 111, E10S90, doi:10.1029/2006JE002690. [2] Leblanc, F., Chaufray, J.-Y., Lilensten, J., Witasse, O., Bertaux, J.-L., (2006) JGR, 111, E09S11, doi:10.1029/2005JE002664. [3] Simon, C., Witasse, O., Leblanc, F., Gronoff, G., Bertaux, J.-L., (2008) submitted to PSS [4] Gronoff, G., Lilensten, J., Simon, C., Barthélemy, M., Leblanc, F., Dutuit, O., (2008) A.&A. 482, 1015- 1029.

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