The Ultraviolet Spectrograph on NASA’s Juno Mission

Gladstone, G. Randall; Persyn, Steven C.; Eterno, John S.; Walther, Brandon C.; Slater, D. C.; Davis, Michael W.; Versteeg, M. H.; Persson, Kristian; Young, Michael K.; Dirks, G.; Sawka, Anthony O.; Tumlinson, Jessica; Sykes, Henry; Beshears, John; Rhoad, Cherie L.; Cravens, J.; Winters, Gregory S.; Klar, Robert; Lockhart, Walter; Piepgrass, B.; Greathouse, T. K.; Trantham, Bradley J.; Wilcox, Philip M.; Jackson, Matthew W.; Siegmund, Oswald H. W.; Vallerga, J. V.; Raffanti, Rick; Martin, Adrian P.; Gérard, Jean‐Claude; Grodent, Denis; Bonfond, Bertrand; Marquet, Benoît; Denis, François

doi:10.1007/978-94-024-1560-5_8

Cited by 56 publications

(69 citation statements)

References 51 publications

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“…Figure focuses on the PJ8 observations and the relationship with possible auroral injection signatures measured by the ultraviolet spectrometer (UVS) instrument on Juno (Gladstone et al, ). Here in addition to the proton spectrogram (same as in Figure b) we include electron spectrograms showing injections (Figure b) with an inverted energy scale.…”

Section: Jedi Observationssupporting

confidence: 55%

Jovian Injections Observed at High Latitude

Haggerty

Mauk

Paranicas

et al. 2019

Geophysical Research Letters

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The polar orbit of Juno at Jupiter provides a unique opportunity to observe high‐latitude energetic particle injections. We measure energy‐dispersed impulsive injections of protons and electrons. Ion injection signatures are just as prevalent as electron signatures, contrary to previous equatorial observations. Included are previously unreported observations of high‐energy banded structures believed to be remnants of much earlier injections, where the particles have had time to disperse around Jupiter. A model fit of the injections used to estimate timing fits the shape of the proton signatures better than it does the electron shapes, suggesting that electrons and protons are different in their abilities to escape the injection region. We present ultaviolet observations of Jupiter's aurora and discuss the relationship between auroral injection features and in situ injection events. We find, unexpectedly, that the presence of in situ particle injections does not necessarily result in auroral injection signatures.

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Section: Jedi Observationssupporting

confidence: 55%

Jovian Injections Observed at High Latitude

Haggerty

Mauk

Paranicas

et al. 2019

Geophysical Research Letters

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“…Observations made by the Hubble Space Telescope were interpreted using color ratio, which allowed incident electron energies to be estimated (Gérard et al, ). This has been followed by color ratio measurements made by the UV spectrometer on board the Juno spacecraft (Bonfond et al, ; Connerney et al, ; Gladstone et al, ). Both Gérard et al () and Bonfond et al () have shown color ratios between 1 and 20 for the Juno UV observations.…”

Section: Resultsmentioning

confidence: 99%

Jovian Auroral Ion Precipitation: Field‐Aligned Currents and Ultraviolet Emissions

et al. 2018

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A model is described for the transport of magnetospheric oxygen ions with low charge state and energies up to several MeV/nucleon (MeV/u) as they precipitate into Jupiter's polar atmosphere. A revised and updated hybrid Monte Carlo model originally developed by Ozak et al. (2010, https://doi.org/10.1029/2010JA015635) is used to model the Jovian X‐ray aurora. The current model uses a wide range of incident oxygen ion energies (10 keV/u to 5 MeV/u) and the most up‐to‐date collision cross sections. In addition, the effects of the secondary electrons generated from the heavy ion precipitation are included using a two‐stream transport model that computes the secondary electron fluxes and their escape from the atmosphere. The model also determines H2 Lyman‐Werner band emission intensities, including a predicted spectrum and the associated color ratio. Implications of the new model results for interpretation of data from National Aeronautics and Space Administration's Juno mission are discussed. In particular, the model predicts that for a 2 MeV/u oxygen ion energy input of 10 mW/m2: (1) escaping electrons are produced with an energy range from 1 eV to 4 keV, which is a smaller range than previous models by Ozak et al. (2013, https://doi.org/10.1002/2013GL50812) predicted, (2) H2 band emission rates of 75 kR are generated, similar to previous estimates, and (3) a newly calculated Lyman and Werner band color ratio of 10 is expected. The color ratios are put into a context of various methane number density distributions.

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“…Hence, infrared observations of Jupiter aurorae, more than being an instantaneous picture of the particle precipitation process as they are in the UV, also monitor the H 3 + column density and temperature. Together with JIRAM, Juno mission carries an UV auroral spectrograph (UVS, Ultraviolet Spectrograph [ Gladstone et al ., ]), to allow comparison of simultaneous observations of both IR and UV emissions from the same regions. JIRAM‐UVS comparison, to be performed in future studies, will give more insights on the auroral processes, allowing studies that are not possible by analyzing IR or UV data alone.…”

Section: Introductionmentioning

confidence: 99%

Infrared observations of Jovian aurora from Juno's first orbits: Main oval and satellite footprints

Mura

Adriani

Altieri

et al. 2017

Geophysical Research Letters

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The Jovian Infrared Auroral Mapper (JIRAM) is an imager/spectrometer on board NASA/Juno mission for the study of the Jovian aurorae. The first results of JIRAM's imager channel observations of the H3+ infrared emission, collected around the first Juno perijove, provide excellent spatial and temporal distribution of the Jovian aurorae, and show the morphology of the main ovals, the polar regions, and the footprints of Io, Europa and Ganymede. The extended Io “tail” persists for ~3 h after the passage of the satellite flux tube. Multi‐arc structures of varied spatial extent appear in both main auroral ovals. Inside the main ovals, intense, localized emissions are observed. In the southern aurora, an evident circular region of strong depletion of H3+ emissions is partially surrounded by an intense emission arc. The southern aurora is brighter than the north one in these observations. Similar, probably conjugate emission patterns are distinguishable in both polar regions.

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The Ultraviolet Spectrograph on NASA’s Juno Mission

Cited by 56 publications

References 51 publications

Jovian Injections Observed at High Latitude

Jovian Injections Observed at High Latitude

Jovian Auroral Ion Precipitation: Field‐Aligned Currents and Ultraviolet Emissions

Infrared observations of Jovian aurora from Juno's first orbits: Main oval and satellite footprints

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