Physics
Scientific paper
May 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984icar...58..227g&link_type=abstract
(IAU, COSPAR, NASA, et al., Colloquium on Natural Satellites, 77th, Cornell University, Ithaca, NY, July 5-9, 1983) Icarus (ISSN
Physics
30
Io, Powder (Particles), Satellite Surfaces, Spectral Reflectance, Spectrophotometry, Sulfur, Limb Darkening, Particle Size Distribution, Quenching (Cooling), Scattering Coefficients, Surface Roughness Effects, Temperature Dependence, Jupiter, Satellites, Sulfur, Photometry, Spectrophotometry, History, Physical Properites, Particles, Experiments, Diameter, Io, Size, Temperature, Thermal Properties, Scattering, Geometry, Reflectance, Quenching, Brightness, Wavelengths, Ultraviolet, Absorption, Data, Mixing, S
Scientific paper
Particle size, temperature, thermal history, and scattering geometry are shown by the present laboratory investigation of the spectrophotometric properties of three particle-size fractions of sulfur to influence the spectral reflectance of both normal and quenched molten samples of sulfur. A scattering law that consists of a linear combination of lunar-like and Lambertian terms adequately describes the data for all particle sizes. Near opposition, sulfur particles closely follow a Minnaert limb darkening law except where the reflectance is low, as in the strong UV absorption band of the larger particle size fractions. The present data indicate that quantitative comparisons between disk-integrated observations of Io and laboratory measurements of flat sulfur samples are inadequate unless temperature effects and scattering geometry changes are included.
Gradie Jonathan
Veverka Joe
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