Physics – Plasma Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsa11a1560g&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SA11A-1560
Physics
Plasma Physics
[0310] Atmospheric Composition And Structure / Airglow And Aurora, [0343] Atmospheric Composition And Structure / Planetary Atmospheres, [6225] Planetary Sciences: Solar System Objects / Mars, [7894] Space Plasma Physics / Instruments And Techniques
Scientific paper
The Martian upper atmosphere undergoes large seasonal neutral density variations. Their amplitude on the composition is however unknown, and up to now theoretical studies did not succeed in explaining accurately the observations. "Retrieval" efforts must be done to understand correctly the mesosphere and upper atmosphere of Mars, one of the best strategy being the inversion of IR-UV emissions. Such works involve a better understanding of the present data, and the definition of future dedicated instruments. Thanks to the SPICAM spectrometer onboard Mars Express, recent results include the first unambiguous observation of the double peak of O(1S) in the atmosphere of Mars. Along with other emissions (such as CO(a3Π ) and CO2+(B) ), the atmospheric composition of the main components of the diurnal atmosphere can be retrieved. The retrieval of these atmospheric parameters necessitates to use a forward model. However, uncertainties on that model (especially on the cross sections and reaction rates) could prevent to obtain a good accuracy. In this work, we present the advances in the retrieval of the atmospheric parameters, along with the computation of uncertainties in the forward model and retrieved datasets. We show the need for a NASA/TIMED-like mission to Mars (Thermosphere-Ionosphere-Mesosphere Energetics and Dynamics) to understand the mesosphere-upper atmosphere of Mars, for which we give recommendations on the observing channels and retrieval techniques.
Gronoff Guillaume
Lilensten Jean
Mertens Chris J.
Simon Ch.
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