Physics – Optics
Scientific paper
Jan 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986rpspr...2...86k&link_type=abstract
In its USSR Report: Space (JPRS-USP-86-001) p 86 (SEE N86-20178 10-88) Transl. into ENGLISH from Astronomicheskiy Vestnik (Mo
Physics
Optics
Asteroids, Galilean Satellites, Geometrical Optics, Light Scattering, Optical Polarization, Optical Reflection, Planetary Surfaces, Surface Properties, Absorptance, Refraction
Scientific paper
Observations of celestial bodies without atmospheres and laboratory experiments with terrestrial samples indicate that the plane polarization of the light scattered by them is sensitive to the composition and structure of the surface. The dependence of the degree of polarization P of scattered light on phase angle alpha is the most informative. With this taken into account, the author applied the geometrical optics approach in examining the scattering of light on spherical body covered by randomly scattered fissures. Single and double reflection and shadow effects are taken into account. It was found that the curve of the dependence of the degree of polarization on phase angle has a negative branch only when the angle between the surfaces is close to 90 deg. Surface structure was found to be the principal factor responsible for the depth and shape of the negative branch of polarization. Asteroids of different types differ substantially with respect to surface structure despite a quite similar nature of surface layer matter: the value of the complex refractive index of this matter is considerably greater than the corresponding value for surface layer matter of the Galilean satellites of Jupiter. Accordingly, any quantitative theory of light reflection by bodies without atmospheres must include parameters determining surface structure.
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