Modeling Specular Reflections from Hydrocarbon Lakes on the Surface of Titan

Details Modeling Specular Reflections from Hydrocarbon Lakes on the Surface of Titan Modeling Specular Reflections from Hydrocarbon Lakes on the Surface of Titan

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufm.p51g1187s&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #P51G-1187

Physics

[5419] Planetary Sciences: Solid Surface Planets / Hydrology And Fluvial Processes, [5470] Planetary Sciences: Solid Surface Planets / Surface Materials And Properties, [6281] Planetary Sciences: Solar System Objects / Titan

Scientific paper

Analysis of the specular reflection of sunlight scattered from a planetary surface can be used to constrain the optical properties (i.e. index of refraction) and physical characteristics including smoothness relative to the wavelength of light. Furthermore, the absolute magnitude of the specular signal can be used as strong evidence, under reasonable assumptions, for the existence of a liquid surface. In this work, we discuss a number of factors that control the maximum observed radiance possible from sunlight scattered specularly off liquid hydrocarbon lake on the surface of Titan. These include attenuation and scattering by gases and aerosols in Titan’s atmosphere, the amplitude of the Fresnel reflection, which is a function of the index of refraction of the liquid contained within a lake and the specific geometry of the observation, the defocusing of the solar image by the convex shape of the surface of Titan, waves on the lake surface, and when the specular reflection is sub-pixel, the reflectance of the non-specular part of the pixel.

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