Variable features in the Valles Marineris region of Mars

Details Variable features in the Valles Marineris region of Mars Variable features in the Valles Marineris region of Mars

Jun 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991pggp.rept..191g&link_type=abstract

In NASA, Washington, Reports of Planetary Geology and Geophysics Program, 1990 p 191-193 (SEE N92-10728 01-91)

Physics

Geophysics

Albedo, Clouds, Deposition, Dust, Erosion, Mars Photographs, Mars Surface, Meteorology, Multispectral Photography, Planetary Geology, Spectra, Variations, Autumn, Canyons, Mariner Spacecraft, Microparticles, Morphology, Photomapping, Sands, Southern Hemisphere, Viking Spacecraft

Scientific paper

Transient phenomena on Mars have long been recognized in Mariner and Viking images as well as in decades of Earth based telescopic observations. These events are of interest because of the information they present on currently active meteorological and geological processes. Changes in surface albedo patterns and atmospheric conditions can also affect the analysis and interpretation of data based on spectral or morphological properties of geologic units on the surface. The mechanism responsible for albedo pattern change is currently under investigation. Generation and subsequent transportation and deposition of dark sands has been interpreted in the Valles. However, the removal of a bright dust layer is more consistent with the rapid time period of the change (about two months) and with preliminary multispectral mapping results which suggest that the dark streak south of Eos and Coprates Chasmata is spectrally distinguishable from the dark saltating materials found elsewhere in the canyon system. If a layer of bright dust was removed to affect the albedo change, questions concerning how such micron-sized particles are mobilized by the winds during a normally quiescent season (Southern Hemisphere Autumn) should be addressed.

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