SO2 frost - UV-visible reflectivity and Io surface coverage

Details SO2 frost - UV-visible reflectivity and Io surface coverage SO2 frost - UV-visible reflectivity and Io surface coverage

Sep 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980georl...7..665n&link_type=abstract

Geophysical Research Letters, vol. 7, Sept. 1980, p. 665-668.

Physics

11

Frost, Io, Planetary Atmospheres, Planetary Surfaces, Spectral Reflectance, Sulfur Dioxides, Ultraviolet Spectra, Atmospheric Composition, Bidirectional Reflectance, Light (Visible Radiation), Space Exploration

Scientific paper

The reflectance spectrum in the range 0.24-0.85 microns of SO2 frost is measured in light of the discovery of SO2 gas in the atmosphere of Io and the possible discovery of the frost on its surface. Frost deposits up to 1.5 mm thick were grown in vacuum at 130 K and bi-directional reflectance spectra were obtained. Typical SO2 frost is found to exhibit very low reflectivity (2-5%) at 0.30 microns, rising steeply at 0.32 microns to attain a maximum reflectivity (75-80%) at 4.0 microns and uniformly high reflectivity throughout the visible and near infrared. Comparison with the full disk spectrum of Io reveals that no more than 20% of the surface can be covered with optically thick SO2 frost. Combinations of surface materials including SO2 frost which can produce the observed spectrum are indicated.

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