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Ganymede's Far-Ultraviolet Reflectance: Constraining Impurities in the Surface Ice
Nichols, J. D.; Raut, U.; Retherford, K. D. +2 more
We present reflectance spectra of Ganymede's leading and trailing hemispheres in the wavelength range 138-215 nm, obtained by the Hubble Space Telescope Cosmic Origins Spectrograph (HST/COS) in 2014. The most notable feature of both spectra is the absence of a sharp water absorption edge at ~165 nm, seen in laboratory measurements of ice reflectiv…
A Survey of Small-Scale Waves and Wave-Like Phenomena in Jupiter's Atmosphere Detected by JunoCam
Wong, Michael H.; Fletcher, Leigh N.; Ingersoll, Andrew P. +17 more
In the first 20 orbits of the Juno spacecraft around Jupiter, we have identified a variety of wave-like features in images made by its public-outreach camera, JunoCam. Because of Juno's unprecedented and repeated proximity to Jupiter's cloud tops during its close approaches, JunoCam has detected more wave structures than any previous surveys. Most…
Possible Transient Luminous Events Observed in Jupiter's Upper Atmosphere
Wong, Michael H.; Gérard, Jean-Claude; Kammer, Joshua A. +10 more
Eleven transient bright flashes were detected in Jupiter's atmosphere using the ultraviolet spectrograph instrument on the Juno spacecraft. These bright flashes are only observed in a single spin of the spacecraft and their brightness decays exponentially with time, with a duration of ∼1.4 ms. The spectra are dominated by H2 Lyman band …