Computer Science
Scientific paper
Nov 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004jqsrt..89..291m&link_type=abstract
Journal of Quantitative Spectroscopy and Radiative Transfer, Volume 89, Issue 1-4, p. 291-301.
Computer Science
18
Scientific paper
We present a model of cometary dust that could provide the correct behaviour of the main observational characteristics in the visual spectral regime. The model reproduces the right shape in angular dependencies of intensity and polarisation as well as their spectral gradients (colours) including the change of colour with scattering angle. The dust particles are described as aggregates of a large number of constituent spheres of radius equal to ˜0.1μm. We use a refractive index that is characterized by high values of its real and imaginary parts both increasing with wavelength. This refractive index reproduces the comet-Halley element content of dust derived from in-situ measurements but the values are typical, in general for carbonaceous materials. The assumed composition is also in a good agreement with laboratory studies of interplanetary dust particles as well as with the current understanding of the material evolution in comets, although further studies of comet dust properties should include a comparison with thermal observations.
Kimura Hiroshi
Kolokolova Ludmilla
Mann Ingrid
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