Observations of high-altitude CO2 hot bands in Mars by the orbiting Thermal Emission Spectrometer

Details Observations of high-altitude CO2 hot bands in Mars by the orbiting Thermal Emission Spectrometer Observations of high-altitude CO2 hot bands in Mars by the orbiting Thermal Emission Spectrometer

Sep 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002jgre..107.5063m&link_type=abstract

Journal of Geophysical Research (Planets), Volume 107, Issue E9, pp. 1-1, CiteID 5063, DOI 10.1029/2001JE001516

Physics

5

Planetology: Solar System Objects: Mars, Atmospheric Composition And Structure: Middle Atmosphere-Energy Deposition, Ionosphere: Solar Radiation And Cosmic Ray Effects, Planetary Sciences: Ionospheres (2459), Meteorology And Atmospheric Dynamics: Radiative Processes

Scientific paper

We present limb spectral measurements of the Martian atmosphere for four seasonal periods produced from data acquired by the Mars Global Surveyor/Thermal Emission Spectrometer. Between the altitudes of approximately 50 and 90 km, nonlocal thermodynamic equilibrium (non-LTE) emission from CO2 hot bands is observed at 10 μm. The centroids of these emissions vary in latitude and height with season, and their emission regions extend approximately 120° in latitude. The emission is considerably stronger in the southern summer/northern winter season than in the corresponding northern summer/southern winter season due to large solar flux variations resulting from the eccentricity of the Martian orbit. Modeling of this emission explains its observed altitude, solar zenith angle, and seasonal dependence.

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