Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26a...407l...5k&link_type=abstract
Astronomy and Astrophysics, v.407, p.L5-L8 (2003)
Astronomy and Astrophysics
Astrophysics
39
Comets: General, Interplanetary Medium, Meteors, Meteoroids, Polarization, Scattering
Scientific paper
Optical observations of cometary dust have revealed that the solar radiation scattered by the dust has common characteristics in the phase-angle and wavelength dependences of intensity (including albedo) and polarization, irrespective of the properties of the parent comets. We present numerical calculations on light scattering by clusters of spheres showing that all of these common optical properties are reproduced by large aggregates consisting of optically dark submicron grains. Our model neither invokes any averaging of the results over size and/or composition of the aggregates nor needs to specify the configuration of the constituent grains. The refractive indices used in this model are consistent with a mixture of silicates, metals, and carbonaceous compounds with the element abundances of cometary dust.
Kimura Haruo
Kolokolova Ludmilla
Mann Ian
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