Specular scattering on a terrestrial playa and implications for planetary surface studies

Details Specular scattering on a terrestrial playa and implications for planetary surface studies Specular scattering on a terrestrial playa and implications for planetary surface studies

Oct 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....9818707s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. E10, p. 18,707-18,718

Mathematics

Probability

15

Bidirectional Reflectance, Light Scattering, Mathematical Models, Nevada, Planetary Surfaces, Playas, Albedo, Photomicrography, Spectroradiometers, Surface Properties, Topography

Scientific paper

Multiangle Advanced Solid State Array Spectroradiometer (ASAS) and Portable Apparatus for Rapid Acquisition of Bidirectional Observations of Land and Atmosphere (PARABOLA) visible and near infrared reflectance data covering the Lunar Lake playa, Nevada, were modeled using specular and volume scattering theory. The volume component used to model the data was based on the Hapke (1986) model and the specular scattering component was based on Fresnel reflection from surface facets with a distribution of tilts. Specular scattering was needed to explain the several-fold increase in reflectance observed at high phase angles in the solar principal plane. Results imply single scattering albedos of approximately 0.93 to 0.95, a real index of refraction value of approximately 1.52 (at a wavelength of 0.66 micron), a small imaginary index of refraction and an exponential facet tilt probability function for the playa. Electron micrographs showed th playa surface to consist of ensembles of smooth, micrometer-scale ellipsoidal particles on gently undulating topography at the millimeter to centimeter scale. The exponential probability function is consistent with this observation. Mars and the icy satellites are discussed as possible places to look for a significant specular scattering component.

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