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On the Relation Between Auroral Morphologies and Compression Conditions of Jupiter's Magnetopause: Observations From Juno and the Hubble Space Telescope
Hospodarsky, G. B.; Kurth, W. S.; Bonfond, B. +11 more
Jupiter displays the most powerful auroral emissions in our solar system, which result from strong energy dissipation in Jupiter's surrounding space environment. Although mass and energy in Jupiter's magnetosphere mostly come from the innermost Galilean moon Io's volcanic activity and Jupiter's rotation, solar wind perturbations can play crucial r…
Jovian Auroral Electron Precipitation Budget—A Statistical Analysis of Diffuse, Mono-Energetic, and Broadband Auroral Electron Distributions
Saur, J.; Mauk, B. H.; Salveter, A. +1 more
Recent observations by the Juno spacecraft have shown that electrons contributing to Jupiter's main auroral emission appear to be frequently characterized by broadband electron distributions, but also less often mono-energetic electron distributions are observed as well. In this work, we quantitatively derive the occurrence rates of the various el…
Relation of Jupiter's Dawnside Main Emission Intensity to Magnetospheric Currents During the Juno Mission
Nichols, J. D.; Cowley, S. W. H.
We compare Jupiter's dawn-side main auroral emission intensity observed by the Hubble Space Telescope with the simultaneous magnitude of the dawn-side magnetospheric equatorial radial current as observed by Juno during Orbits 3-7. We show that the peak auroral intensity and the square of the radial current per radian of azimuth are strongly correl…
Determining the Beaming of Io Decametric Emissions: A Remote Diagnostic to Probe the Io-Jupiter Interaction
Kurth, W. S.; Cecconi, B.; Lamy, L. +8 more
We investigate the beaming of 11 Io-Jupiter decametric (Io-DAM) emissions observed by Juno/Waves, the Nançay Decameter Array, and NenuFAR. Using an up-to-date magnetic field model and three methods to position the active Io Flux Tube (IFT), we accurately locate the radiosources and determine their emission angle θ from the local magnetic field vec…
Constraining Europa's Subsolar Atmosphere With a Joint Analysis of HST Spectral Images and Galileo Magnetic Field Data
Saur, J.; Cervantes, S.
We constrain Europa's tenuous atmosphere on the subsolar hemisphere by combining two sets of observations: oxygen emissions at 1,304 and 1,356 Å from Hubble Space Telescope (HST) spectral images and Galileo magnetic field measurements from its closest encounter, the E12 flyby. We describe Europa's atmosphere with three neutral gas species: global …
Variability of Jupiter's Main Auroral Emission and Satellite Footprints Observed With HST During the Galileo Era
Clarke, John T.; Moore, Luke; Bonfond, Bertrand +3 more
Hubble Space Telescope images of Jupiter's UV aurora show that the main emission occasionally contracts or expands, shifting toward or away from the magnetic pole by several degrees in response to changes in the solar wind dynamic pressure and Io's volcanic activity. When the auroral footprints of the Galilean satellites move with the main emissio…
Ganymede's Auroral Footprint Latitude: Comparison With Magnetodisc Model
Bonfond, B.; Nichols, J. D.; Vogt, M. F. +3 more
Variations of Ganymede's auroral footprint locations are presented based on observations by the Hubble Space Telescope in 2007 and 2016. The poleward and equatorward shifts of Ganymede's footprint could be influenced by the mass outflow rate from Io and the solar wind compression, as the internal and external factors respectively. We compare our r…
Illuminating the Motions of Jupiter's Auroral Dawn Storms
Nichols, J. D.; Rutala, M. J.; Clarke, J. T. +1 more
Jupiter's auroral main emission (ME) has long been considered to be the result of currents keeping plasma corotating with the surrounding magnetosphere. As a result, the ME corotates with the planet, and individual auroral features making up the ME roughly follow suit. Jupiter's dawn storms, some of the rarest and brightest auroral features within…