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Jupiter's Aurora Observed With HST During Juno Orbits 3 to 7

Kurth, W. S.; Saur, J.; McComas, D. J. +20 more

A large set of observations of Jupiter's ultraviolet aurora was collected with the Hubble Space Telescope concurrently with the NASA-Juno mission, during an eight-month period, from 30 November 2016 to 18 July 2017. These Hubble observations cover Juno orbits 3 to 7 during which Juno in situ and remote sensing instruments, as well as other observa…

Evidence for Auroral Emissions From Callisto's Footprint in HST UV Images

Gérard, Jean-Claude; Clarke, John T.; Grodent, Denis +3 more

Auroral emissions are expected from the footprint of Callisto in Jupiter's upper atmosphere owing to the known interaction of its atmosphere with Jupiter's magnetosphere, and from the observed auroral emissions from the footprints of the other three Galilean satellites. The mapping of Callisto along modeled magnetic field lines at Jupiter, however…

Hubble Space Telescope Observations of Variations in Ganymede's Oxygen Atmosphere and Aurora

Milan, S. E.; Nichols, J. D.; Clarke, J. T. +7 more

We present high-sensitivity Hubble Space Telescope (HST) Cosmic Origins Spectrograph and HST Space Telescope Imaging Spectrograph measurements of atmospheric OI 130.4-nm and OI] 135.6-nm emissions at Ganymede, which exhibit significant spatial and temporal variability. These observations represent the first observations of Ganymede using HST Cosmi…

Evolution of the Auroral Signatures of Jupiter's Magnetospheric Injections

Roussos, E.; Paranicas, C.; Bonfond, B. +3 more

Auroral emissions equatorward of the main emission at Jupiter are suggested to reflect the dynamics of the plasma in the middle magnetosphere. Here we examine the motion of the auroral signatures of magnetospheric injections appearing in Hubble Space Telescope (HST) images. Our results suggest that the injected plasma moves planetward and lags beh…

Saturn's Northern Auroras and Their Modulation by Rotating Current Systems During Late Northern Spring in Early 2014

Lamy, L.; Badman, S. V.; Cowley, S. W. H. +3 more

The Hubble Space Telescope imaged Saturn's northern ultraviolet auroras during February-June 2014, when Saturn's northern and southern magnetic perturbation fields were locked in antiphase and matched in rotation period ( 10.69 hr). During this coalescence period, we test for evidence of rotational modulation of the auroras using the latest rotati…