Identification Of CO2+ In IR Spectral Observations From The Orbiting MGS/TES

Details Identification Of CO2+ In IR Spectral Observations From The Orbiting MGS/TES Identification Of CO2+ In IR Spectral Observations From The Orbiting MGS/TES

Oct 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007dps....39.2415m&link_type=abstract

American Astronomical Society, DPS meeting #39, #24.15; Bulletin of the American Astronomical Society, Vol. 39, p.456

Astronomy and Astrophysics

Astronomy

Scientific paper

The Retarding Potential Analyzer on Vikings 1 and 2 measured the densities of the principal ions (O2+, CO2+, O+) in Mars atmosphere. In addition, the Mariner 6, 7 and 9 UV instruments measured the production rate of CO2+ using two of its ultraviolet bands (A 2Πu --> X 2Πg) at 3000-3400 Å and the doublet (B 2Σ+u --> X 2Π g) at 2883 and 2896 Å.
Here we present newly-identified mid-IR features of CO2+ from which we plan to derive lower ionosphere CO2+ densities. The limb of Mars’ atmosphere at 50 km has been modeled over 400-600 cm-1 using available density profiles and MGS/TES observed temperature averages. Comparison is made to an orbiting MGS/TES spectral average over 30°S - 30°N, 42 - 84 km for Ls=140° - 150° (early northern autumn). Good agreement of observed and strong synthetic spectral peak positions is shown over 400 - 600 cm-1 (CO2+ molecular bending region). As expected above 600 cm-1, a number of additional observed MGS/TES features appear to correspond to weaker CO2+ peaks in the synthetic spectrum. However, the observed S/N makes identification problematic for features in 1200-1900 cm-1. Additional work is planned to improve the fit by accounting, for example, more fully for seasonal and altitude dependencies.
This research was supported in part by the NASA Mars Data Analysis Program.

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