Physics – Optics
Scientific paper
Oct 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985avest..19..165k&link_type=abstract
(Astronomicheskii Vestnik, vol. 19, Apr.-June 1985, p. 165-173) Solar System Research (ISSN 0038-0946), vol. 19, no. 2, Oct. 198
Physics
Optics
Celestial Bodies, Geometrical Optics, Light Scattering, Polarization Characteristics, Polarized Light, Surface Cracks, Crustal Fractures, Galilean Satellites, Refractivity, Solar System
Scientific paper
An analytical model is developed for the degree of polarization and the phase angle of light scattered from the surface of atmosphereless bodies such as many of the planetary satellites, the asteroids and Mercury. The theory of geometrical optics is applied to describing light scattering by a spherical surface with randomly distributed cracks. Account is taken of single and double reflections and the presence of shadow effects. Negative branches in the degree of polarization as a function of the phase angle are found to appear only when the angle between the sides of a crack is close to 90 deg. The theory of experimental design is used to examine the effects of the refraction and absorption indices of the surface material and structures on the polarization characteristics of scattered light. The surface structure is shown to dominate the depth and shape of the negative branch of polarization. The calculations, in comparison with observational evidence, suggest that the asteroids have surface structures that differ substantially from one asteroid to another, while the surface material is very similar. The material is also more refractive than that of the Galilean satellites.
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