Middle infrared thermal maps of Venus at the time of the Galileo encounter

Details Middle infrared thermal maps of Venus at the time of the Galileo encounter Middle infrared thermal maps of Venus at the time of the Galileo encounter

Sep 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991sci...253.1536o&link_type=abstract

Science (ISSN 0036-8075), vol. 253, Sept. 27, 1991, p. 1536-1538. Research sponsored by National Research Council of Canada.

Physics

1

Galileo Project, Infrared Imagery, Satellite Imagery, Thermal Mapping, Venus (Planet), Brightness Temperature, Flyby Missions, Limb Darkening, Satellite Observation

Scientific paper

Images of the disk of Venus, taken at wavelengths between 8 and 22 micrometers, were obtained a few days after the Galileo spacecraft's closest approach on February 8, 1990; these images show variations in the thickness of the main H2SO4 cloud deck and the overlying temperature structure. Several features are qualitatively similar to those of earlier observations, such as a hot region at the south pole, surrounded by a cold 'collar', and brightening toward the lower latitudes, where low-contrast banding appears. The collar does have a northern counterpart that is warmer, however. Equatorial limb darkening is quantitatively similar to that of previous observations; fairly constant at wavelengths up to 20 micrometers, where limb darkening increases substantially. In contrast to what was found in previous observations, polar and equatorial limb darkening are nearly the same at most wavelengths. A longitudinal variation is observable that is consistent with a wavenumber-2 behavior and a brightness maximum near local midnight.

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