Year: 2018
Type: article
Abstract: 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 observatories, obtained a wealth of unprecedented information on Jupiter's magnetosphere and the connection with its auroral ionosphere. Jupiter's ultraviolet aurora is known to vary rapidly, with timescales ranging from seconds to one Jovian rotation. The main objective of the present study is to provide a simplified description of the global ultraviolet auroral morphology that can be used for comparison with other quantities, such as those obtained with Juno. This represents an entirely new approach from which logical connections between different morphologies may be inferred. For that purpose, we define three auroral subregions in which we evaluate the auroral emitted power as a function of time. In parallel, we define six auroral morphology families that allow us to quantify the variations of the spatial distribution of the auroral emission. These variations are associated with changes in the state of the Jovian magnetosphere, possibly influenced by Io and the Io plasma torus and by the conditions prevailing in the upstream interplanetary medium. This study shows that the auroral morphology evolved differently during the five ~2 week periods bracketing the times of Juno perijove (PJ03 to PJ07), suggesting that during these periods, the Jovian magnetosphere adopted various states.
DOI: 10.1002/2017ja025046
Authors: Denis Grodent, B. Bonfond, Z. Yao, J.‐C. Gérard, A. Radioti, M. Dumont, B. Palmaerts, A. Adriani, S. V. Badman, E. J. Bunce, J. T. Clarke, J. E. P. Connerney, G. R. Gladstone, T. Greathouse, T. Kimura, W. S. Kurth, B. H. Mauk, D. J. McComas, J. D. Nichols, G. S. Orton, L. Roth, J. Saur, P. Valek
Institutions: University of Liège, Institute for Space Astrophysics and Planetology, National Institute for Astrophysics, Lancaster University, University of Leicester, Boston University, Goddard Space Flight Center, Southwest Research Institute, RIKEN, University of Iowa, Johns Hopkins University, Johns Hopkins University Applied Physics Laboratory, Princeton University, Jet Propulsion Laboratory, KTH Royal Institute of Technology, University of Cologne, The University of Texas at San Antonio
Language: English
Subfield: Space and Planetary Science
Field: Earth and Planetary Sciences
Domain: Physical Sciences
Open Access status: green
Funders: National Aeronautics and Space Administration, California Institute of Technology, Southwest Research Institute, Space Telescope Science Institute, European Space Agency, Fonds De La Recherche Scientifique - FNRS, Belgian Federal Science Policy Office, Centre National d’Etudes Spatiales, Centre National de la Recherche Scientifique, Jet Propulsion Laboratory, Observatoire de Paris, Université de Recherche Paris Sciences et Lettres, Science and Technology Facilities Council, Japan Society for the Promotion of Science
Awards: Juno Science Team Meeting Funding, Energy release and transfer processes of rotating magnetospheres uncovered by combinations of space telescope and explorer, ASTIlluminating Solar-Planetary Interactions, G4879067688, A Consolidated Grant Proposal for Astrophysics and Solar System Research at the University of Leicester, 2013-2016, G8231462333
OpenAlex ID: W2789650381