The effect of surface roughness on the spectral reflectance of dielectric particles - Application to the zodiacal light

Details The effect of surface roughness on the spectral reflectance of dielectric particles - Application to the zodiacal light The effect of surface roughness on the spectral reflectance of dielectric particles - Application to the zodiacal light

Jul 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...148..347s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 148, no. 2, July 1985, p. 347-358.

Astronomy and Astrophysics

Astrophysics

12

Dielectrics, Interplanetary Medium, Light Scattering, Spectral Reflectance, Surface Roughness Effects, Zodiacal Light, Correlation, Scattering Cross Sections

Scientific paper

The average light scattering cross section of an ensemble of large convex randomly oriented slightly absorbing dielectric particles is calculated. The surface is assumed to be slightly rough, with height deviations smaller than the wavelength. Two types of roughness correlation functions are considered, a gaussian and an exponential function. It results that the main effects of a slight surface roughness are a darkening of the surface and a reddening of its reflectance spectrum. It is shown that this particle model can well reproduce the observed reddening curve of the zodiacal light in the visual. As a realistic surface model for the interplanetary dust particles a superposition of this slight roughness on large scale surface irregularities is proposed; this model can explain the observed increase of reddening with decreasing scattering angle as well as the flattening of the polarization curve with increasing wavelength.

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