Modeling quasi-specular scattering from the surface of Titan

Details Modeling quasi-specular scattering from the surface of Titan Modeling quasi-specular scattering from the surface of Titan

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007jgre..11205012s&link_type=abstract

Journal of Geophysical Research, Volume 112, Issue E5, CiteID E05012

Physics

Geophysics

2

Biogeosciences: Remote Sensing, Electromagnetics: Random Media And Rough Surfaces, Nonlinear Geophysics: Fractals And Multifractals, Planetary Sciences: Solar System Objects: Saturn, Planetary Sciences: Solar System Objects: Titan

Scientific paper

The Cassini spacecraft obtained several scattering observations of the surface of Titan. Four data sets, TA-Inbound, TA-Outbound, T3-Outbound, and T8-Inbound, include scatterometer data for small angles of incidence. Analysis of these data sets provides an example use of a new generalized fractal-based quasi-specular scattering law that gives the surface RMS slope as a function of horizontal scale and covers a wide range of scattering behavior using a small number of parameters. The data have a significant diffuse scattering component which is modeled with the empirical cosine law, A cos n $\theta$. The reflectivity and RMS surface parameters are retrieved from the quasi-specular scattering model. The average RMS slope for the four data sets is about 4.2° at a horizontal scale of 5λ λ ~ 2.18 cm. The Fresnel power reflection coefficient ρ is approximately equal to 0.085 (corresponding to a dielectric constant $\epsilon$ r ~ 3.3) for TA-Outbound and T3-Outbound and 0.034 ($\epsilon$ r ~ 2.1) for TA-Inbound and T8-Inbound. Inadequate modeling of diffuse scattering by the cosine law results in increased uncertainties in the inferred surface parameters, especially ρ, and, consequently, in inferences of the surface composition.

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