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On Martian nitrogen dayglow emission observed by SPICAM UV spectrograph/Mars Express
Author(s) -
Leblanc F.,
Chaufray J. Y.,
Bertaux J. L.
Publication year - 2007
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2006gl028437
Subject(s) - martian , mars exploration program , atmosphere of mars , spectrograph , airglow , physics , astrobiology , atmosphere (unit) , exosphere , atmospheric sciences , thermosphere , astrophysics , atmospheric escape , nitrogen , astronomy , spectral line , ionosphere , meteorology , ion , quantum mechanics
SPICAM UV spectrograph on board Mars Express has reported, for the first time, the identification of the N 2 VK (0,5) and (0,6) band emissions in the Martian dayglow. The derived exospheric temperature of the N 2 species in the upper Martian atmosphere is equal to 190 ± 51 K for areocentric longitudes between 100° and 171° and equal to 257 ± 71 K for areocentric longitudes between 287° and 321°. These temperatures are in agreement with the ones deduced from the analysis of the 289 nm emission associated with the CO 2 major Martian atmospheric species. The intensity of the N 2 VK (0,6) band is found to be ∼3 times smaller than the calculated intensity of Fox and Dalgarno (1979) which is reasonable when considering the uncertainties in the parameters used by Fox and Dalgarno (1979) and the uncertainties on SPICAM UVS observations.