Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991sci...253.1263c&link_type=abstract
Science (ISSN 0036-8075), vol. 253, Sept. 13, 1991, p. 1263-1266.
Astronomy and Astrophysics
Astronomy
56
Astronomical Observatories, Infrared Imagery, Infrared Spectra, Venus (Planet), Absorption Spectra, Atmospheric Composition, Near Infrared Radiation, Sulfuric Acid, Thermal Emission, Venus Atmosphere
Scientific paper
Near-IR images and spectra of the night side of Venus taken at the Anglo-Australian Telescope during February 1990 reveal four new thermal emission windows at 1.10, 1.18, 1.27, and 1.31 microns, in addition to the previously discovered windows at 1.74 and 2.3 microns. Images of the Venus night side show similar bright and dark markings in all windows, but their contrast is much lower at short wavelengths. The 1.27-micron window includes a bright, high-altitude O2 airglow feature in addition to a thermal contribution from the deep atmosphere. Simulations of the 1.27- and 2.3-micron spectra indicate water vapor mixing ratios near 40 + or - 20 ppm by volume between the surface and the cloud base.
Allen David A.
Crisp Dave
Grinspoon David H.
Pollack James B.
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