Other
Scientific paper
Aug 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986icar...67..264h&link_type=abstract
Icarus (ISSN 0019-1035), vol. 67, Aug. 1986, p. 264-280. NASA-supported research.
Other
326
Astronomical Spectroscopy, Bidirectional Reflectance, Celestial Bodies, Extinction, Light Scattering, Reflected Waves, Amplitudes, Asteroids, Europa, Lunar Surface, Oberon
Scientific paper
An analytical model is developed for the opposition effect (heiligenshein) in the case of light scattering from a semi-infinite, particulate medium with particles that are large relative to the wavelength. The effect is common for natural materials, and comprises a brightness surge in light diffusively reflected from a surface at near zero phase. A generalized expression is devised for the extinction coefficient of a particulate medium. Models are developed for step function and hyperbolic tangent distributions of light scattered from a stratified medium and exhibiting the opposition effect. A maximum brightness amplitude increase of 0.753 is projected for the effect. Greater values must have other causes.
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