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First observation of the oxygen 630 nm emission in the Martian dayglow

dc.contributor.authorGérard, J.-C.
dc.contributor.authorAoki, S.
dc.contributor.authorGkouvelis, L.
dc.contributor.authorSoret, L.
dc.contributor.authorWillame, Y.
dc.contributor.authorThomas, I.R.
dc.contributor.authorDepiesse, C.
dc.contributor.authorRistic, B.
dc.contributor.authorVandaele, A.C.
dc.contributor.authorHubert, B.
dc.contributor.authorDaerden, F.
dc.contributor.authorPatel, M.R.
dc.contributor.authorLópez-Moreno, J.-J.
dc.contributor.authorBellucci, G.
dc.contributor.authorMason, J.P.
dc.contributor.authorLópez-Valverde, M.A.
dc.date2021
dc.date.accessioned2021-05-04T12:19:22Z
dc.date.available2021-05-04T12:19:22Z
dc.identifier.urihttps://orfeo.belnet.be/handle/internal/7753
dc.descriptionFollowing the recent detection of the oxygen green line airglow on Mars, we have improved the statistical analysis of the data recorded by the NOMAD/UVIS instrument on board the ExoMars Trace Gas Orbiter mission by summing up hundreds of spectra to increase the signal‐to‐noise ratio. This led to the observation of the OI 630 nm emission, the first detection in a planetary atmosphere outside the Earth. The average limb profile shows a broad peak intensity of 4.8 kR near 150 km. Comparison with a photochemical model indicates that it is well predicted by current photochemistry, considering the sources of uncertainty. The red/green line intensity ratio decreases dramatically with altitude as a consequence of the efficient quenching of O(1D) by CO2. Simultaneous observations of the green and red dayglow will provide information on variations in the thermosphere in response to seasonal changes and the effects of solar events.
dc.languageeng
dc.titleFirst observation of the oxygen 630 nm emission in the Martian dayglow
dc.typeArticle
dc.subject.frascatiPhysical sciences
dc.audienceScientific
dc.subject.freeEXOMARS
dc.subject.freedayglow
dc.subject.freeMars
dc.subject.freeoxygen
dc.subject.freevisible
dc.source.titleGeophysical Research Letters
dc.source.volume48
dc.source.issue8
dc.source.pagee2020GL092334
Orfeo.peerreviewedYes
dc.identifier.doi10.1029/2020GL092334


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