Chemistry (all); Biochemistry, Genetics and Molecular Biology (all); Multidisciplinary; Physics and Astronomy (all)
Abstract :
[en] Jupiter exhibits peculiar multiwavelength auroral emissions resulting from the electromagnetic interactions of Io, Europa, and Ganymede with the magnetospheric plasma flow. Characterizing the faint auroral footprint of the fourth Galilean moon, Callisto, has always been challenging because of its expected weakness and its proximity to Jupiter's bright main aurora. Here, we report on unusual magnetospheric conditions that led to an equatorward shift of Jupiter's main auroral oval unveiling the auroral footprints of the four Galilean moons in a single observation. Remote observations by the Juno spacecraft reveal a double-spot structure, characteristic of the footprints of the other three moons, with a maximum ultraviolet brightness of 137 ± 15 kR. Concurrent observations within Callisto's flux tube reveal field-aligned electrons with a characteristic energy of 10 keV, depositing an energy flux of 55 mW.m-2 in Jupiter's atmosphere. The electron properties are consistent with the triggering of radio emissions with intensities lower than 5 × 10-18 W.m-2.Hz-1.
Research Center/Unit :
STAR - Space sciences, Technologies and Astrophysics Research - ULiège
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Rabia, J ; Institut de Recherche en Astrophysique et Planétologie (IRAP), CNRS, CNES, Toulouse, France. jonas.rabia@irap.omp.eu
Hue, V ; Aix-Marseille Université, Institut Origines, LAM, Marseille, France
Louis, C K ; LIRA, Observatoire de Paris, Université PSL, Sorbonne Université, Université Paris Cité, CY Cergy Paris Université, CNRS, 92190, Meudon, France
André, N; Institut de Recherche en Astrophysique et Planétologie (IRAP), CNRS, CNES, Toulouse, France ; ISAE-Supaero, Université de Toulouse, Toulouse, France
Szalay, J R ; Department of Astrophysical Sciences, Princeton University, Princeton, NJ, USA
Prangé, R ; LIRA, Observatoire de Paris, Université PSL, Sorbonne Université, Université Paris Cité, CY Cergy Paris Université, CNRS, 92190, Meudon, France
Lamy, L ; LIRA, Observatoire de Paris, Université PSL, Sorbonne Université, Université Paris Cité, CY Cergy Paris Université, CNRS, 92190, Meudon, France ; Aix-Marseille Université, CNRS, CNES, LAM, Marseille, France
Zarka, P ; LIRA, Observatoire de Paris, Université PSL, Sorbonne Université, Université Paris Cité, CY Cergy Paris Université, CNRS, 92190, Meudon, France
Collet, B ; Aix-Marseille Université, CNRS, CNES, LAM, Marseille, France
Allegrini, F; Southwest Research Institute, San Antonio, TX, USA ; Department of Physics and Astronomy, University of Texas at San Antonio, San Antonio, TX, USA
Ebert, R W ; Southwest Research Institute, San Antonio, TX, USA ; Department of Physics and Astronomy, University of Texas at San Antonio, San Antonio, TX, USA
Greathouse, T K ; Southwest Research Institute, San Antonio, TX, USA
Bonfond, Bertrand ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Gladstone, G R ; Southwest Research Institute, San Antonio, TX, USA
Sulaiman, A H ; School of Physics and Astronomy, Minnesota Institute for Astrophysics, University of Minnesota, Minneapolis, MN, USA
Kurth, W S ; Department of Physics and Astronomy, University of Iowa, Iowa City, IA, USA
Connerney, J E P; Space Research Corporation, Annapolis, MD, USA ; NASA/Goddard Space Flight Center, Greenbelt, MD, USA
Louarn, P; Institut de Recherche en Astrophysique et Planétologie (IRAP), CNRS, CNES, Toulouse, France
Penou, E; Institut de Recherche en Astrophysique et Planétologie (IRAP), CNRS, CNES, Toulouse, France
Kamran, A ; Institut de Recherche en Astrophysique et Planétologie (IRAP), CNRS, CNES, Toulouse, France
Santos-Costa, D; Southwest Research Institute, San Antonio, TX, USA
Giles, R S; Southwest Research Institute, San Antonio, TX, USA
Kammer, J A; Southwest Research Institute, San Antonio, TX, USA
Versteeg, M H; Southwest Research Institute, San Antonio, TX, USA
Bolton, S J ; Southwest Research Institute, San Antonio, TX, USA
ANR - Agence Nationale de la Recherche AMU - Aix-Marseille Université
Funding text :
French co\u2010authors acknowledge the support of CNES for the Juno and JUICE missions. This study has been partially supported through the grant EUR TESS N\u00B0ANR\u201018\u2010EURE\u20100018 in the framework of the Programme des Investissements d\u2019Avenir. V. H. acknowledges support from the French government under the France 2030 investment plan, as part of the Initiative d\u2019Excellence d\u2019Aix\u2010Marseille Universit\u00E9 \u2013 A*MIDEX AMX\u201022\u2010CPJ\u201004. French authors acknowledge the support of CNRS/INSU national programs of planetology (PNP) and heliophysics (PNST). The work at SwRI was funded by the NASA New Frontiers Program for Juno through contract NNM06AA75C. B. B. is a Research Associate of the Fonds de la Recherche Scientifique, FNRS. We thank Jacques Gustin for providing us with a synthetic H spectrum of the Jovian auroras. 2French co\u2010authors acknowledge the support of CNES for the Juno and JUICE missions. This study has been partially supported through the grant EUR TESS N\u00B0ANR\u201018\u2010EURE\u20100018 in the framework of the Programme des Investissements d\u2019Avenir. V. H. acknowledges support from the French government under the France 2030 investment plan, as part of the Initiative d\u2019Excellence d\u2019Aix\u2010Marseille Universit\u00E9 \u2013 A*MIDEX AMX\u201022\u2010CPJ\u201004. French authors acknowledge the support of CNRS/INSU national programs of planetology (PNP) and heliophysics (PNST). The work at SwRI was funded by the NASA New Frontiers Program for Juno through contract NNM06AA75C. B. B. is a Research Associate of the Fonds de la Recherche Scientifique, FNRS. We thank Jacques Gustin for providing us with a synthetic H2 spectrum of the Jovian auroras.
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