Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982icar...51...65t&link_type=abstract
Icarus, vol. 51, July 1982, p. 65-95.
Astronomy and Astrophysics
Astronomy
72
Aerosols, Astronomical Photometry, Pioneer 11 Space Probe, Planetary Atmospheres, Polarimetry, Titan, Atmospheric Models, Data Reduction, Lambert Surface, Limb Darkening, Mie Scattering, Polarization Characteristics, Rayleigh Scattering, Scattering Functions, Voyager 1 Spacecraft
Scientific paper
Pioneer 11 measurements of Titan's limb darkening and polarization at red and blue wavelengths are refined, and the integrated disk brightness measurements at phase angles from 22 to 96 deg, over which Titan's phase coefficient averages about 0.014 magnitudes/deg in both colors, are reduced. Comparisons of the data with vertically homogeneous multiple scattering models indicate that the single-scattering phase functions of the aerosols in both colors are flat at scattering angles between 80 and 150 deg, with a small peak at larger scattering angles. Although a vertically homogeneous model in which particles are assumed to scatter as spheres cannot simultaneously match the polarization observations of both colors for any refractive index, observed polarizations are most sensitive to the particle properties near optical depth 1/2 in each color. Models based on single scattering by spheres can therefore be successful over a range of refractive indices, if the size of the particles increases with depth and if the cross section of the particles increases sufficiently rapidly with decreasing wavelength.
Smith Paul H.
Tomasko Martin G.
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