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American Geophysical Union, Geophysical Research Letters, 21(42), p. 9040-9049, 2015

DOI: 10.1002/2015gl065489

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Retrieval of CO2 and N2 in the Martian thermosphere using dayglow observations by IUVS on MAVEN: MAVEN/IUVS RETRIEVALS OF CO2 AND N2

Journal article published in 2015 by J. S. Evans, M. H. Stevens, J. D. Lumpe, N. M. Schneider, A. I. F. Stewart, J. Deighan, S. K. Jain ORCID, M. S. Chaffin, M. Crismani ORCID, A. Stiepen, W. E. McClintock, G. M. Holsclaw, F. Lefèvre, D. Y. Lo, J. T. Clarke and other authors.
This paper was not found in any repository, but could be made available legally by the author.
This paper was not found in any repository, but could be made available legally by the author.

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Abstract

We present direct number density retrievals of carbon dioxide (CO2) and molecular nitrogen (N2) for the upper atmosphere of Mars using limb scan observations during October and November 2014 by the Imaging Ultraviolet Spectrograph on board NASA's Mars Atmosphere and Volatile EvolutioN (MAVEN) spacecraft. We use retrieved CO2 densities to derive temperature variability between 170 and 220 km. Analysis of the data shows (1) low-mid latitude northern hemisphere CO2 densities at 170 km vary by a factor of about 2.5, (2) on average, the N2/CO2 increases from 0.042 ± 0.017 at 130 km to 0.12 ± 0.06 at 200 km, and (3) the mean upper atmospheric temperature is 324 ± 22 K for local times near 14:00.