Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975icar...26..332a&link_type=abstract
Icarus, vol. 26, Nov. 1975, p. 332-340.
Astronomy and Astrophysics
Astronomy
Dust Storms, Mariner 9 Space Probe, Mars Surface, Ultraviolet Spectrometers, Astronomical Models, Mars Atmosphere, Optical Thickness, Spectral Reflectance, Ultraviolet Reflection
Scientific paper
A least-squares analysis of 709 Mariner 9 UV spectra obtained over Hellas from Revolution 140 to 214 (Jan. 22, 1972, to Feb. 28, 1972) showed the extinction optical depth of the atmosphere above Hellas to be 0.5 plus or minus 0.2. This is evidence of lingering dust in the Hellas basin. An atmospheric model, combining dust and Rayleigh scattering, was used to make an apparent pressure map of Hellas. Anomalously high pressures are interpreted as clouds developing over the southern part of Hellas near the time of autumnal equinox. The blue ratio (reflectance at 2680 A divided by reflectance at 3050 A) showed a 20% increase from Revolution 40 to Revolution 74, attributed to the decay of the dust storm. Thereafter, the blue ratio remained essentially constant through Revolution 214, which implies that the rate of clearing in Hellas was much slower than that planetwide.
Ajello Joseph M.
Pang Kevin D.
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