HR: 0800h
AN: P21B-0155    [Abstracts]
TI: SPICAM on MARS Express: An Overview of UV and Near IR Results
AU: * Bertaux, J
EM: bertaux@aerov.jussieu.fr
AF: Service d'Aeronomie du CNRS/IPSL, BP 3, Verrieres-le-Buisson, 91371 France
AU: Korablev, O
EM: korablev@aerov.jussieu.fr
AF: Space Research Institute (IKI), 84/32 Profsoyuznaya, Moscow, 117810 Russian Federation
AU: Quemerais, E
EM: quemerais@aerov.jussieu.fr
AF: Service d'Aeronomie du CNRS/IPSL, BP 3, Verrieres-le-Buisson, 91371 France
AU: Perrier, S
EM: severine.perrier@aerov.jussieu.fr
AF: Service d'Aeronomie du CNRS/IPSL, BP 3, Verrieres-le-Buisson, 91371 France
AU: Fedorova, A
EM: anna.fedorova@aerov.jussieu.fr
AF: Service d'Aeronomie du CNRS/IPSL, BP 3, Verrieres-le-Buisson, 91371 France
AU: Leblanc, F
EM: francois.leblanc@aerov.jussieu.fr
AF: Service d'Aeronomie du CNRS/IPSL, BP 3, Verrieres-le-Buisson, 91371 France
AU: Montmessin, F
EM: franck.montmessin@aero.jussieu.fr
AF: Service d'Aeronomie du CNRS/IPSL, BP 3, Verrieres-le-Buisson, 91371 France
AU: Lefevre, F
EM: Franck.lefevre@aero.jussieu.fr
AF: Service d'Aeronomie du CNRS/IPSL, BP 3, Verrieres-le-Buisson, 91371 France
AU: Lebonnois, S
EM: sebastien.lebonnois@lmd.jussieu.fr
AF: Laboratoire de Meteorologie Dynamique/IPSL, Universite Paris 6, Paris, 75252 France
AU: Muller, C
EM: christian.muller@bira-iasb.be
AF: Belgian Institute for Space Aeronomy, 3 av. Circulaire, Brussels, B-1180 Belgium
AU: Fussen, D
EM: didier.fussen@bira-iasb.be
AF: Belgian Institute for Space Aeronomy, 3 av. Circulaire, Brussels, B-1180 Belgium
AU: Sandel, B
EM:
AF: Lunar and Planetary Laboratory, 1541 E.University Boulevard, Univ.of Arizona, Tucson, AZ AZ 85721 United States
AU: Stern, A S
EM:
AF: SouthWest Research Institute, Walnut Street, Boulder, CO CO 80302 United States
AB: SPICAM, a light-weight (4.8 kg) UV-IR dual spectrometer on board Mars Express orbiter, is dedicated primarily to the study of the atmosphere and ionosphere of Mars, but is providing important results on the surface albedo of Mars. A UV imaging spectrometer (118 - 320 nm, resolution 1.5 nm, intensified CCD) operates in nadir viewing, limb viewing and atmospheric vertical profiling by stellar and solar occultation. An IR spectrometer (1.0-1.7 microns, resolution 0.5-1.2 nm, or = 1300, mass 0.8 kg) is dedicated primarily to nadir measurements of H2O abundances, but detects also water ice and CO2 ice both on perennial and seasonal caps. It is based on AOTF technology; and it is the first time that such a spectrometer is flying in deep space. Night glow emissions from NO recombination and aurora over crustal magnetic anomalies have been discovered. Several hundreds of atmospheric vertical profiles by UV star occultation were obtained. The main absorbers are CO2 (below 200 nm) and aerosols/dust (above 200 nm). The atmospheric pressure and temperature are retrieved from 150 km down to 25-40 km, for the construction of an empirical model of the atmosphere. In 60 % of cases there is a detached layer of dust, or cloud. Ozone is also measured and compared to model predictions. The UV absorption of ozone is well identified in routine reflectance nadir viewing. The ozone vertical quantity is recovered along the orbital track, and compared to the water vapour distribution measured by SPICAM in the near Infra-red around 1.38 m. SPICAM has thus obtained for the first time from an orbiter simultaneous measurements of ozone and H2O, which are found to be somewhat anti-correlated as expected on the ground of chemistry consideration: catalytic destruction of ozone from OH and HO2 radicals. We observed also the O2 Airglow at 1.27 μm in nadir and limb viewing produced by photo-dissociated ozone, and all UV limb dayglow emissions that were observed by Mariner spacecraft.
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0305 Aerosols and particles (0345, 4801, 4906)
DE: 0310 Airglow and aurora
DE: 0343 Planetary atmospheres (5210, 5405, 5704)
SC: Planetary Sciences [P]
MN: Fall Meeting 2005