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- W2014200212 abstract "Abstract The Mariner 7 ultraviolet spectrometer observed the south polar cap of Mars. The near ultraviolet polar spectrum showed that light reflected from the surface predominates over light scattered from the atmosphere. The intensity of thee reflected radiation was analyzed as a function of the incidence and emission angles, assuming that the surface reflects according to Minnaert's law. While the micro-relief of the surface determines the general trend of the intensity curve, topographic sl slopes cause small scale changes on the intensity curve. These variations are systematic and are well-correlated with surface features seen in the television pictures. A method has been formulated to determine the average slope of an area fromm intensity ratio measurements made at any two different sets of illumination and observation angles. Since the Mariner 7 data consist of only observations under one lighting and viewing conditions it is possible to obtain only the minimum slope that can cause an observed intensity change, and not the true slope. Such slopes in the polar region scanned are of the order of tenths of a degree, when averaged over areas of hundreds by tens of kilometers. The rms slope for the entire region is greater than 0°.3. These results are consistent with visible and radar wavelength measurements." @default.
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- W2014200212 date "1972-06-01" @default.
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- W2014200212 title "Mariner 7 ultraviolet spectrometer experiment: Topographic slopes of Mars' polar region" @default.
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- W2014200212 doi "https://doi.org/10.1016/0019-1035(72)90100-5" @default.
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