Abstract
MARTIAN clouds have been classified1 into Type I, which are visible at short optical wavelengths, and become gradually invisible as the wavelength increases; and Type II, which are visible at long wavelengths, and fade into invisibility when the wavelength decreases. The three principal kinds of observed Martian clouds—yellow, white, and blue—can be categorized as Type I, blue; and Type II, yellow and white. This distinction is essential. Yellow and white clouds are classified together because they are visible in the same wavelength range; yellow clouds are dust clouds and will not be described here.
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WELLS, R. Mars: Are Observed White Clouds composed of H2O?. Nature 238, 324–326 (1972). https://doi.org/10.1038/238324a0
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DOI: https://doi.org/10.1038/238324a0
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