Physics – Geophysics
Scientific paper
Oct 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007dps....39.2002h&link_type=abstract
American Astronomical Society, DPS meeting #39, #20.02; Bulletin of the American Astronomical Society, Vol. 39, p.448
Physics
Geophysics
Scientific paper
It is well known that the bidirectional reflectance of a particulate medium such as a planetary regolith depends on the porosity, in contrast to predictions of models based on the equation of radiative transfer (RTE) as usually formulated. It is shown that this failure to predict porosity dependence arises from an incorrect treatment of the light that passes between the particles in the RTE. In this paper a more physically correct treatment is used together with the two-stream approximation to solve the radiative transfer equation and derive improved expressions for the bidirectional and directional-hemispherical reflectances. It is found that decreasing the porosity increases the reflectance of low and medium albedo powders, but decreases it for ones with very high albedos. The model agrees qualitatively with measured data. This work is sponsored by a grant from the NASA Geology and Geophysics Program.
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