Airborne spectroscopy and spacecraft radiometry of Venus in the far infrared

Details Airborne spectroscopy and spacecraft radiometry of Venus in the far infrared Airborne spectroscopy and spacecraft radiometry of Venus in the far infrared

Feb 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982icar...49..227a&link_type=abstract

Icarus, vol. 49, Feb. 1982, p. 227-243.

Astronomy and Astrophysics

Astronomy

10

Airborne Equipment, Astronomical Spectroscopy, Far Infrared Radiation, Infrared Radiometers, Michelson Interferometers, Venus Atmosphere, Atmospheric Models, Atmospheric Temperature, Brightness Temperature, C-141 Aircraft, Infrared Spectra, Limb Darkening, Opacity, Particle Density (Concentration), Particle Size Distribution, Pioneer Venus 1 Spacecraft, Radiance, Telluric Lines, Venus Clouds, Venus, Spectroscopy, Radiometry, Infrared, Spectra, Kao, Temperature, Brightness Temperature, Clouds, Structure, Pio

Scientific paper

The first spectral observations of the Venus disk in the 110 to 270 per cm spectral range are reported, made from the Kuiper Airborne Observatory in mid-March 1979, some three months following the start of the Pioneer Venus Orbiter mission. The instrumentation and its differences from earlier flight hardware is discussed. The brightness temperature was 275 K near 110/cm, dropping to 230 K near 270/cm. Radiance calculations, using temperature and cloud structure formation from the Pioneer Venus mission and including gaseous absorption by the collision-induced dipole of CO2, yield results consistently brighter than the observations. The atmospheric environment is reviewed with regard to the FIR opacity and possible particle distribution modifications are discussed. It is concluded that the most likely possibility for supplementing the FIR opacity is a population of large particles in the upper cloud with number densities less than one particle per cu cm which has remained undetected by in situ measurements.

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