Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jats...35.2356d&link_type=abstract
Journal of the Atmospheric Sciences, vol. 35, Dec. 1978, p. 2356-2361.
Astronomy and Astrophysics
Astronomy
2
Astronomical Spectroscopy, Equatorial Atmosphere, Infrared Astronomy, Limb Darkening, Polar Regions, Venus Atmosphere, Aerosols, Atmospheric Models, Atmospheric Temperature, Infrared Spectra, Radiation, Temperatures, Observations, Venus, Limbs, Darkening, Infrared, Spectrum, Imagery, Wavelengths, Models, Brightness, Polar Regions, Equatorial Regions, Spatial Resolution
Scientific paper
The spectral dependence of limb-darkening of Venus in the 8-20-micron region has been measured for both the equatorial and polar directions. It is shown that the magnitude and spectral variation of the polar darkening are, in general, greater than the equatorial darkening. The equatorial darkening, in fact, appears to be nearly spectrally invariant in this wavelength region, at least for the portion of the disk covered by the observations. The magnitude of the equatorial darkening is consistent with a temperature lapse rate of roughly 3 K/km, assuming a model in which aerosol is distributed exponentially and mixed homogeneously with atmospheric gas.
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