Article (Scientific journals)
First observation of the oxygen 630 nm emission in the Martian dayglow
Gérard, Jean-Claude; Aoki, Shohei; Gkouvelis, Leonardos et al.
2021In Geophysical Research Letters, 48
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Keywords :
Mars; dayglow; red line; 630 nm; EXOMARS; NOMAD; model; photochemistry; composition
Abstract :
[en] Following 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, a 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.
Research center :
STAR - Space sciences, Technologies and Astrophysics Research - ULiège
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Gérard, Jean-Claude  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO)
Aoki, Shohei ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Gkouvelis, Leonardos ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Soret, Lauriane  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Willame, Y.
Thomas, I.
Depiesse
Ristic, B.
Vandaele, A.C.
Hubert, Benoît  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Daerden, F.
Patel, M.
López-Moreno, J.J.
Bellucci, G.
Mason, J.P.
López-Valverde, M.A.
More authors (6 more) Less
Language :
English
Title :
First observation of the oxygen 630 nm emission in the Martian dayglow
Publication date :
April 2021
Journal title :
Geophysical Research Letters
ISSN :
0094-8276
eISSN :
1944-8007
Publisher :
Wiley, Washington, United States - District of Columbia
Volume :
48
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
Politique Scientifique Fédérale (Belgique) - BELSPO
Available on ORBi :
since 24 May 2021

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