Variable features on Mars III: Comparison of Mariner 1969 and Mariner 1971 photography |
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| Authors: | J Veverka Carl Sagan Lynn Quam R Tucker B Eross |
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| Institution: | Laboratory for Planetary Studies, Cornell University, Ithaca, New York 14850, USA;Artificial Intelligence Laboratory, Stanford University, Stanford, California 94305, USA |
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| Abstract: | Mariner 9 (M9) and Mariner 6 and 7 photography of common regions of Mars are compared, with appropriate attention to the photometric properties of the camera systems. The comparison provides a 2.5yr time baseline for study of variable albedo features. We find the development of bright streaks and patches, a phenomenon unobserved through the entire M9 mission; the evolution of dark crater splotches into dark streaks; and a planetwide increase in splotchiness. Yet, a large number of splotches and albedo boundaries remain fixed over the same period. Many of the observations are interpreted in terms of a global fallout and subsequent local redistribution of bright fine particulates raised by global dust storms. |
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