Observations of the 10-micron natural laser emission from the mesospheres of Mars and Venus

Details Observations of the 10-micron natural laser emission from the mesospheres of Mars and Venus Observations of the 10-micron natural laser emission from the mesospheres of Mars and Venus

Sep 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983icar...55..347d&link_type=abstract

Icarus (ISSN 0019-1035), vol. 55, Sept. 1983, p. 347-355.

Computer Science

34

Atmospheric Temperature, Carbon Dioxide, Lasers, Mars Atmosphere, Mesosphere, Venus Atmosphere, Emission Spectra, Flux (Rate), Heterodyning, Infrared Absorption, Nonthermal Radiation, Planetary Limb, Plotting, Temperature Measurement, Planets, Mesosphere, Mars, Venus, Observations, Emissions, Laser, Flux, Source, Formation, Absorption, Infrared, Wavelengths, Models, Collisions, Carbon Dioxide, Comparisons, Theoretical Studies, Kinetics, Temperature, Analysis, Altitude, Rotation

Scientific paper

Observations of the total flux and center to limb dependence of the nonthermal emission occurring in the cores of the 9.4 and 10.4 micrometers CO2 bands on Mars are compared to a theoretical model based on this mechanism. The model successfully reproduces the observed center to limb dependence of this emission, to within the limits imposed by the spatial resolution of the observations of Mars and Venus. The observed flux from Mars agrees closely with the prediction of the model; the flux observed from Venus is 74 percent of the flux predicted by the model. This emission is used to obtain the kinetic temperatures of the Martian and Venusian mesospheres. For Mars near 70 km altitude, a rotational temperature analysis using five lines gives T = 135 + or - 20 K. The frequency width of the emission is also analyzed to derive a temperature of 126 + or - 6 K. In the case of the Venusian mesosphere near 109 km, the frequency width of the emission gives T = 204 + or - 10 K.

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