Article (Scientific journals)
Nitric Oxide Nightglow and Martian Mesospheric Circulation from MAVEN/IUVS Observations and LMD-MGCM Predictions
Stiepen, Arnaud; Jain; Schneider et al.
2017In Journal of Geophysical Research. Space Physics
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Keywords :
Mars; airglow; atmosphere; waves; nightside
Abstract :
[en] We report results from a study of nitric oxide nightglow over the northern hemisphere of Mars during winter, the southern hemisphere during fall equinox and equatorial latitudes during summer in the northern hemisphere based on observations of the delta and gamma bands between 190 and 270 nm by the Imaging UltraViolet Spectrograph (IUVS) on the MAVEN spacecraft. The emission reveals recombination of N and O atoms dissociated on the dayside of Mars and transported to the nightside. We characterize the brightness (from 0.2 to 30 kR) and altitude (from 40 to 115 km) of the NO night- glow layer, as well as its topside scale height (mean of 11 km). We show the possible impact of atmospheric waves forcing longitudinal variability, associated with an increased brightness by a factor 3 in the 140° - 200° longitude region in the northern hemisphere winter and in the -102° to -48° longitude region at summer. Such impact to the NO nightglow at Mars was not seen before. Quantitative comparison with calculations of the LMD-MGCM (Laboratoire de Meteorologie Dynamique - Global Circulation Model) suggests that the model globally reproduces the trends of the NO nightglow emissionand its seasonal variation, but also indicates large discrepancies (up to a fac- tor 50 fainter in the model) in northern winter at low to mid-latitudes. This suggests that the predicted transport is too efficient towards the night winter pole in the thermosphere by 20 latitude north.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Stiepen, Arnaud ;  Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Jain
Schneider
Deighan
Gonzalez-Galindo
Gérard, Jean-Claude  ;  Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO)
Milby
Stevens
Bougher, Stephen W.
Evans
Stewart
Chaffin
McClintock
Clarke
Holsclaw
Montmessin
Lefèvre
Forget
Lo
Hubert, Benoît  ;  Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Jakosky, Bruce M.
More authors (11 more) Less
Language :
English
Title :
Nitric Oxide Nightglow and Martian Mesospheric Circulation from MAVEN/IUVS Observations and LMD-MGCM Predictions
Publication date :
2017
Journal title :
Journal of Geophysical Research. Space Physics
ISSN :
2169-9380
eISSN :
2169-9402
Publisher :
Wiley, Hoboken, United States - New Jersey
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 15 May 2017

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