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Hazy Blue Worlds: A Holistic Aerosol Model for Uranus and Neptune, Including Dark Spots

Fletcher, L. N.; Pérez-Hoyos, S.; Wong, M. H. +7 more

We present a reanalysis (using the Minnaert limb-darkening approximation) of visible/near-infrared (0.3-2.5 µm) observations of Uranus and Neptune made by several instruments. We find a common model of the vertical aerosol distribution i.e., consistent with the observed reflectivity spectra of both planets, consisting of: (a) a deep aerosol …

Callisto's Atmosphere: First Evidence for H₂ and Constraints on H₂O

Alday, Juan; Johnson, Robert E.; Roth, Lorenz +8 more

We explore the parameter space for the contribution to Callisto's H corona observed by the Hubble Space Telescope from sublimated H₂O and radiolytically produced H₂ using the Direct Simulation Monte Carlo method. The spatial morphology of this corona produced via photoelectron and magnetospheric electron-impact-induced dissoc…

Mapping the Brightness of Ganymede's Ultraviolet Aurora Using Hubble Space Telescope Observations

Saur, J.; Strobel, D. F.; Roth, L. +4 more

We analyze Hubble Space Telescope observations of Ganymede made with the Space Telescope Imaging Spectrograph between 1998 and 2017 to generate a brightness map of Ganymede's oxygen emission at 1,356 Å. Our Mercator projected map demonstrates that the brightness along Ganymede's northern and southern auroral ovals strongly varies with longitude. T…