[en] The Juno spacecraft’s polar orbits have enabled direct sampling of Jupiter’s low-altitude auroral field lines. How various auroral signatures can be reconciled across all datasets and fit into the bigger picture of Jupiter’s auroral generation mechanisms remains to be established. Jupiter’s main aurora has been classified into distinct zones , based on repeatable signatures found in energetic electron and proton spectra. We combine fields, particles, and plasma wave datasets to analyze Zone-I and Zone-II, which are suggested to carry the upward and downward field-aligned currents, respectively. We find Zone-I to have well-defined boundaries across all datasets. H+ and/or H3+ cyclotron waves are
commonly observed in Zone-I in the presence of energetic upward H+ beams and downward energetic electron beams. Zone-II, on the other hand, does not have a clear poleward boundary with the polar cap, and its signatures are more sporadic. Large-amplitude solitary waves, which are reminiscent of those ubiquitous in Earth’s downward current region, are a key feature of Zone-II. Alfvénic fluctuations are most prominent in the diffuse aurora and are repeatedly found to diminish in Zone-I and Zone-II, likely due to dissipation, at higher altitudes, to energize auroral electrons. Finally, we identify sharp and well-defined electron density depletions, by up to two orders of magnitude, in Zone-I, and discuss their important implications for the development of parallel potentials, Alfvénic dissipation, and radio wave generation.
Research Center/Unit :
STAR - Space sciences, Technologies and Astrophysics Research - ULiège
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Sulaiman, Ali; University of Iowa [US]
Allegrini, F.; SwRI - Southwest Research Institute [US]
Clark, G.; JHU - Johns Hopkins University [US]
Gladstone, G.R.; SwRI - Southwest Research Institute [US]
Kotsiaros, S.; Technical University of Denmark [DK]
Kurth, W.; UNiversity of Iowa [US]
Mauk, B.; JHU - Johns Hopkins University [US]
Szalay, J.; Princeton University [US]
Bagenal, F.; UCB - University of Colorado Boulder [US-CO]
Bonfond, Bertrand ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Connerney, J.E.P.; NASA - National Aeronautics and Space Administration [US-DC]
Ebert, R.; SwRI - Southwest Research Institute [US]
Elliott, S.; U. Minn - University of Minnesota [US]
Gershman, D.; NASA - National Aeronautics and Space Administration [US-DC]
Hospodarsky, G.B.; UNiveristy of Iowa [US]
Hue, V.; SwRI - Southwest Research Institute [US]
Lysak, R.; U. Minn - University of Minnesota [US]
Masters, A.; Imperial College London [GB]
Santolík, O.; Institute of Atmospheric Physics of the Czech Academy of Sciences [CZ]
Saur, J.; University of Cologne [DE]
Bolton, S.; SwRI - Southwest Research Institute [US]
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