Title: SPICAM first results from MarsExpress, there is still some good planetary science to be done from or
1SPICAM first results from Mars-Express, there is
still some good planetary science to be done from
orbiters and remote based telescopes!
- C. Muller (1), D. Gillottay (1), D. Moreau (1),
D. Fonteyn (1), S. Perrier (2), J.L.Bertaux (2),
E. Quemerais (2), F. Lefèvre (2), O.Korablev (3)
,A. Fedorova (3)(1) Belgian Institute for Space
Aeronomy, avenue Circulaire, 3, B-1180 Brussels,
Belgium (2) Service dAéronomie du C.N.R.S.,
Verrières-le-Buisson, France, (3) Institute for
Space Research, Moscow, Russia,
2Mars express
Chronology Dec 25 insertion Jan 12 Feb 20
first results, commissioning. April 15- May 7
deployment Marsis May 7 begin of nominal phase.
3SPICAM First Observations of Mars Atmosphere
- SPICAM a light-weight (4.5 kg) dual
spectrometer, Ultra-violet and Near Infra-red - mainly dedicated to the study of gases (Carbon
Dioxyde CO2), Ozone (O3), Water vapor (H2O). - First complete vertical profile of
density/temperature of CO2 (10-110km) obtained
ever from an orbiter - First simultaneous measurements of Ozone and
water vapor from an orbiter - First use of a compact AOTF spectrometer (Near
Infra-red)
4UV
MEX/ SPICAM
SPICAM Ultra-Violet observations, orbit 8, 9
jan. 2004
IR
Absorption by gas
tv vertical optical thickness of absorption,
varies strongly with wavelength
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SPICAM near Infra-red observations, orbit 8, 9
jan. 2004
Scattering by surface with albedo A
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7Atmospheric Transmission
SPICAM Ultra-Violet observations, orbit 17, 13
jan. 2004
ratio
MARS EXPRESS
SPICAM
Line of sight
Star
Atmosphere
Orbit
MARS
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9Relevance of SPICAM measurements
- Vertical profiles (10-120km) of CO2/atmosphere
will allow to validate/modify current General
Circulation Models (latitude, season) necessary
for aerobraking/aerocapture predictions, help for
future missions - Simultaneous measurements of ozone/water vapour
- characterize the Life conditions on Mars
surface - verify the theory that water vapour destroys
ozone - High significance for future of the stratosphere
of Earth growing concern that Global warming
will result in potential new threat to the ozone
layer (comparative planetology) - Measurement of surface properties
characterisation of ices. - Observation of several proxies of aeronomical
phenomena. -
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13OMEGA
visible
H2O
CO2
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15PFS
16Conclusions
- An orbiter or a high spatial resolution telescope
allow to follow the local and global environment
at the same time. - Assimilation techniques will allow the link
between the microscale provided by landers and
the global scale. - Finally, remote sensing of the subsurface
environment has still to be proven.