Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977icar...32..190c&link_type=abstract
Icarus, vol. 32, Oct. 1977, p. 190-209.
Astronomy and Astrophysics
Astronomy
10
Mars Atmosphere, Oao 2, Saturn (Planet), Td-1 Satellite, Ultraviolet Astronomy, Albedo, Diurnal Variations, Dust Storms, Hydrogen Sulfide, Satellite Observation, Spaceborne Astronomy, Spectral Resolution, Ultraviolet Photometry, Viking Mars Program
Scientific paper
Ultraviolet photometric and spectrophotometric observations of Mars and Saturn, obtained from two earth-orbiting satellites, are discussed. High-resolution data reveal no definite absorption features in the spectra of either planet. In order to reconcile the absence of a prominent absorption in the Mars data near 2150 A with preliminary Viking measurements of NO, this gas must be preferentially concentrated at high Martian altitudes. Broadband photometry from OAO-2 shows that atmospheric dust from the great dust storm of 1971-1972 on Mars reduced the ultraviolet geometric albedo by a factor of 3 at the height of the storm. Atmospheric energy deposition appears to be an important mechanism of the storm dynamics. The combined Saturn data indicate that NH3 is not the absorber that influences the UV spectrum of Saturn. The possibility that H2S is the absorber is investigated.
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