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SO2 frost - UV-visible reflectivity and Io surface coverageThe 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.
Document ID
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Nash, D. B.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Fanale, F. P.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Nelson, R. M.
(California Institute of Technology, Jet Propulsion Laboratory, Pasadena Calif., United States)
Date Acquired
August 10, 2013
Publication Date
September 1, 1980
Publication Information
Publication: Geophysical Research Letters
Volume: 7
Subject Category
Lunar And Planetary Exploration
Accession Number
Funding Number(s)
Distribution Limits

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