The distribution of fine fraction of lunar soil obtained by remote sensing.

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Moon Soil: Remote Sensing, Moon Soil: Composition, Moon Soil: Distribution

Scientific paper

With a given model for granulometric composition of soil, the estimation of a mean (or effective) size of particles can be made from the measured values of A and Pmax for each of the objects under observation. In the paper the previously derived relationship was used: log D = 5.552 log A + 3.410 log Pmax -7.092, where D is an effective size of particles in μm, A is albedo in %, and Pmax is the maximum degree of polarization measured by percentage. As a basis for the calculations of effective sizes of particles, the values of albedo and maximum degree of polarization were used on 190 sites (λ = 0.440 μm) from the Kvaratskheliya catalog [1988], on 21 sites (λ = 0.420 μm) from the Shkuratov et al. catalog [1993], and on 142 sites (λ = 0.600 μm) from the Dollfus and Deschamps catalog [1986]. These data show, that younger objects predominate by virtue of a coarser fraction of lunar soil in the surface layer (new craters, bright rays of new craters). However, the floor of the old crater Grimaldi, which is covered by maturer regolith, contains soil with a substantial predominance of a fine powdered fraction.

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