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| Titel |
The Mars and Venus airglow: observations and excitation processes |
| VerfasserIn |
Jean-Claude Gérard, Lauriane Soret, Arnaud Stiepen |
| 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 |
250048528
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| Zusammenfassung |
| Airglow spectra of Mars and Venus resemble each other as a consequence of the
similar chemical composition of the atmosphere of the two planets. However, the
intensities and the spatial distribution of the emissions reflect differences in distance
from the Sun, total atmospheric pressure, N2/CO2 and O/CO2 ratios and dynamical
processes.
We shall briefly review excitation processes for the day- and night-side airglows on both
planets. Recent ultraviolet dayglow observations collected with the SPICAM instrument
on board Mars Express and the UVIS spectrograph during the Cassini flyby of
Venus will be presented and discussed. Measurements of the nitric oxide δ and γ
bands in the UV nightglow of both planets with SPICAM and SPICAV will be
reported.
The relationship between the O2(1Δ) and OH Meinel emissions observed with the
VIRTIS infrared spectral imager in the nightside Venus atmosphere will be discussed.
The similarity of their spatial distribution suggests a common precursor to both
emissions. The intensity and the vertical distribution of these two features will be
compared with those predicted by model calculations assuming that the reaction
between ozone and atomic hydrogen is the main source of vibrationally excited OH
radical. |
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