High spectral resolution ground-based observations of Venus in the 450- to 1250 kayser region

Details High spectral resolution ground-based observations of Venus in the 450- to 1250 kayser region High spectral resolution ground-based observations of Venus in the 450- to 1250 kayser region

Oct 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977icar...32..210k&link_type=abstract

Icarus, vol. 32, Oct. 1977, p. 210-224.

Astronomy and Astrophysics

Astronomy

5

Absorption Spectra, Astronomical Spectroscopy, Carbon Dioxide, Thermal Emission, Venus Atmosphere, Emission Spectra, High Resolution, Michelson Interferometers, Planetary Radiation, Sulfuric Acid, Transmittance, Ultraviolet Astronomy

Scientific paper

Ground-based observations of Venus were made with a 5-cm drive Michelson interferometer during December 1970 and December 1973. The thermal emission spectrum of the central portion of the apparent disk was recorded from 450-1250 kaysers with an apodized spectral resolution of 0.25 kaysers. All statistically significant sharp line-absorption features in the spectrum have been identified with gaseous CO2. Comparison between the observed spectrum and a synthetic spectrum computed from a model atmosphere, assuming gaseous CO2 and a sulfuric acid haze as opacity sources, indicates good agreement. A broad diffuse absorption feature associated with the sulfuric acid haze is evident in the 870- to 930 kayser region. With the exception of the rotational lines of the 927 kayser CO2 band, the above feature appears as a continuum down to 0.25 kayser resolution. In the 750- to 1250 kayser range, the spectrum exhibits moderate thermal contrast with maximum brightness temperatures of 234-238 K occurring near 825 kaysers. These temperatures are in general agreement with previous measurements.

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