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Specular scattering on a terrestrial playa and implications for planetary surface studiesMultiangle 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.
Document ID
19950045577
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Shepard, Michael K.
(Washington University St. Louis, MO, United States)
Arvidson, Raymond E.
(Washington University St. Louis, MO, United States)
Guinness, Edward A.
(Washington University St. Louis, MO, United States)
Date Acquired
August 16, 2013
Publication Date
October 25, 1993
Publication Information
Publication: Journal of Geophysical Research
Volume: 98
Issue: E10
ISSN: 0148-0227
Subject Category
Lunar And Planetary Exploration
Accession Number
95A77176
Funding Number(s)
CONTRACT_GRANT: NAGW-1358
CONTRACT_GRANT: NAGW-1872
Distribution Limits
Public
Copyright
Other

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