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| Titel |
UV airglow - remote sensing of the Martian upper atmosphere |
| VerfasserIn |
Guillaume Gronoff, Cyril Simon Wedlund, Christopher Mertens, Jean Lilensten  , Stephen Bougher, Mathieu Barthelemy |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250051470
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| Zusammenfassung |
| The SPICAM spectrometer onboard Mars Express was able to detect several aspects of the
Martian UV airglow. Some of the observed emissions need modelling efforts, while for others
the discrepancy between the model and the observation comes only from the thermospheric
parameters. Since the Martian upper atmosphere undergoes large seasonal neutral density
variations, it is then useful to study these variations through the airglow instead of depending
on the less practical occultation techniques.
In this work, we present our techniques to retrieve the upper atmosphere density thanks to
the O(1S), the CO(a3Î ) (Cameron bands) and the CO2+(B) emissions. The use of the
forward model, Aeroplanets, along with the database for the cross sections AtMoCiad, allows
to estimate the uncertainties. The CO2 densities retrieved independently from each emission
are in good agreement, and can be compared to densities deduced from occultation where the
two techniques overlap.
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. |
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