Supplementary Analysis of Io's Disk-Integrated Solar Phase Curve

Details Supplementary Analysis of Io's Disk-Integrated Solar Phase Curve Supplementary Analysis of Io's Disk-Integrated Solar Phase Curve

Jul 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998icar..134..113d&link_type=abstract

Icarus, Volume 134, Issue 1, pp. 113-136.

Computer Science

6

Scientific paper

Analysis of the disk-integrated phase curves of Io's leading and trailing hemispheres, as derived from combined groundbased and Voyager spacecraft measurements, shows that Io's leading side is more porous than its trailing hemisphere (assuming a globally uniform particle grain size distribution) and that the material of the trailing side is more opaque at 0.47 and 0.55 μm than the material of the leading hemisphere. The scattering nature of the leading hemisphere particles in the optically active layer of the regolith demonstrates both forward and backward scattering components. At 0.47 μm the forward scattering component is larger in amplitude than the backward scattering component, whereas at 0.55 μm they are nearly equivalent. No large phase angle data was available to adequately constrain the scattering behavior of the trailing hemisphere regolith. Measures of the geometric albedo are higher for the leading hemisphere than for the trailing hemisphere. Leading hemisphere geometric albedos are ~0.7 to ~0.85 at 0.47 and 0.55 mum, respectively. Trailing hemisphere albedos are ~0.64 to ~0.82 at 0.47 and 0.55 mum, respectively. Phase integral values for the leading hemisphere are 0.61 and 0.59 at 0.47 and 0.55 mum, respectively, which are lower than previously quoted values. Measures of the phase coefficient are higher than those previously published in the literature. No variations in Hapke parameter derived surface characteristics are observed between jovian and anti-jovian hemispheres.

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