Spectrum of the Venus day sky

Details Spectrum of the Venus day sky Spectrum of the Venus day sky

Mar 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980natur.284..243m&link_type=abstract

Nature, vol. 284, Mar. 20, 1980, p. 243, 244.

Computer Science

2

Absorption Spectra, Atmospheric Radiation, Solar Radiation, Spectrum Analysis, Venus Atmosphere, Carbon Dioxide, Dayglow, Venera Satellites, Water, Venus, Spectrum, Solar Radiation, Atmosphere, Gases, Absorption Spectra, Venera 11, Venera 12, Equatorial Regions, Spectrophotometers, Data, Equipment, Carbon Dioxide, Water, Flux, Analysis, Intensity, Clouds, Optical Properties, Mixing, Comparisons, Gas Chromatography, Concentrations, Rayleigh Scattering

Scientific paper

Observations of the spectrum of scattered and vertical solar radiation within the Venus daytime atmosphere obtained by the Venera 11 and 12 descent craft are reported. Spectra and radiation intensities were recorded in the range 0.43 to 1.55 microns by scanning spectrophotometers onboard the spacecraft at altitudes of 62, 56 and 51 km within the cloud layer, and below its lower boundary at 49 km. The radiation intensities observed at various elevations indicate the presence of three cloud sublayers at 49-52 km, 52-58 km and 58-62 km with different extinction coefficients. Analysis of the data in terms of a 20-layer atmospheric model results in a model of the Venus atmosphere consisting of a cloud layer between 49 and 68 km with an optical depth between 25 and 35, a 49-52 km sublayer optical depth of about 12, a single scattering albedo between 0.998 and 1.000 and a weak aerosol haze below the main cloud layer. Synthetic spectra calculations on the basis of this model indicate a H2O/CO2 mixing ratio of 0.00002 near the surface, increasing to 0.0002 in the clouds. Upper limits of 10 to the -8th, 10 to the -10th and 5 x 10 to the -10th to the mixing ratios of gaseous sulfur, Cl2, Br2 and NO2 in the atmosphere are also derived.

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