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Io: Longitudinal Distribution of Sulfur Dioxide Frost

Matson, D. L.; Nelson, R. M.; Lane, A. L. +3 more

Twenty spectra of Io (0.26 to 0.33 micrometer), acquired with the International Ultraviolet Explorer spacecraft, have been studied. There is a strong ultraviolet absorption shortward of 0.33 micrometer that is consistent with earlier ground-based spectrophotometry; its strength is strongly dependent on Io's rotational phase angle at the time of ob…