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Lyman-α imaging of the SO₂ distribution on Io

Ballester, Gilda E.; Wolven, Brian C.; Feldman, Paul D. +7 more

Imaging spectroscopy of Io in the ultraviolet (1160-1720 Å) was carried out with the Space Telescope Imaging Spectrograph on HST on three dates in October 1997 and August 1998. Among the initial results was the observation of concentrated regions of Hi Lyman-α flux near the poles of Io that exhibited a morphology and temporal variability different…