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American Geophysical Union, Geophysical Research Letters, 21(42), p. 9031-9039, 2015

DOI: 10.1002/2015gl065341

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Study of the Martian cold oxygen corona from the O I 130.4 nm by IUVS/MAVEN: MARTIAN COLD OXYGEN CORONA

Journal article published in 2015 by J. Y. Chaufray, J. Deighan, M. S. Chaffin, N. M. Schneider, W. E. McClintock, A. I. F. Stewart, S. K. Jain ORCID, M. Crismani ORCID, A. Stiepen, G. M. Holsclaw, J. T. Clarke, F. Montmessin, F. G. Eparvier ORCID, E. M. B. Thiemann, P. C. Chamberlin 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

First observations of the O I 130.4 nm resonant line performed by the Imaging Ultraviolet Spectrograph (IUVS) aboard the Mars Atmosphere and Volatile EvolutioN mission (MAVEN) are presented in this paper. This emission line is observed during the different orbit phases of MAVEN. The atomic oxygen density and the temperature at 200 km are retrieved from an automatic pipeline using a radiative transfer model for resonant scattering lines for a selection of coronal profiles. These selected profiles are representative of the coronal scans done during the first months of the mission (from November 2014 to January 2015). The derived oxygen density and the temperature near the exobase are in the predicted range by the current thermospheric models of Mars for moderate solar activity, and some diurnal variations are observed. However, the absolute calibration of the instrument significantly limits the accuracy of density and temperature results.