Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978icar...33..554r&link_type=abstract
Icarus, vol. 33, Mar. 1978, p. 554-557.
Astronomy and Astrophysics
Astronomy
1
Atmospheric Models, Atmospheric Radiation, Emission Spectra, Infrared Spectra, Thermal Emission, Venus Atmosphere, Airborne Equipment, Atmospheric Composition, Atmospheric Temperature, Brightness Temperature, Infrared Astronomy, Spectrometers, Sulfuric Acid, Venus Clouds, Venus, Spectroscopy, Emissions, Spectrum, Atmosphere, Sulfuric Acid, Thermal Properties, Carbon Dioxide, Chemical Composition
Scientific paper
A far-IR emission spectrum of Venus covering the wavelength range from 17 to 38 microns is examined which was obtained on five nights at an altitude of 14 km with the 30-cm telescope of the NASA Lear Jet. The spectrum is found to be characterized by an overall continuum level with noticeable absorption shortward of 20 microns and longward of 30 microns as compared with a 245-K blackbody. The continuum level is taken as implying a continuous source of opacity in the Venusian atmosphere over the entire range from 17 to 38 microns with increased opacity shortward of 20 microns and longward of 30 microns. It is shown that a haze of sulfuric acid droplets can provide the necessary opacity and explain the observed depressions. A pressure level of roughly 200 mb is deduced for this spectrum.
Forrest William John
Houck James R.
Pollack James B.
Reed Robert A.
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