Journal article
A Comprehensive Set of Juno In Situ and Remote Sensing Observations of the Ganymede Auroral Footprint
Geophysical research letters, Vol.49(7), pp.e2021GL096994-n/a
04/16/2022
DOI: 10.1029/2021GL096994
Abstract
Jupiter's satellite auroral footprints are a manifestation of the satellite‐magnetosphere interaction of the Galilean moons. Juno's polar elliptical orbit enables crossing the magnetic flux tubes connecting each Galilean moon with their associated auroral emission. Its payload allows measuring the fields and particle population in the flux tubes while remotely sensing their associated auroral emissions. During its thirtieth perijove, Juno crossed the flux tube directly connected to Ganymede's leading footprint spot, a unique event in the entire Juno prime mission. Juno revealed a highly‐structured precipitating electron flux, up to 316 mW/m2, while measuring both a small perturbation in the magnetic field azimuthal component and small Poynting flux with an estimated total downward current of 4.2 ± 1.2 kA. Based on the evolution of the footprint morphology and the field and particle measurements, Juno transited for the first time through a region connected to the transhemispheric electron beam of the Ganymede footprint.
Plain Language Summary
The interaction between Jupiter's corotating plasma torus and the Galilean satellites generates a set of complex magnetospheric processes. One such interaction produces permanent auroral spots around Jupiter's northern and southern poles, known as footprints. For each close flyby, Juno's in situ instruments can measure such interaction. During its thirtieth perijove, Juno crossed the magnetic field lines connecting the interaction region of Ganymede with one of its auroral spots on Jupiter. This study describes and analyzes the set of measurements associated with that unique event.
Key Points
Juno crossed the magnetic flux tube connected to Ganymede auroral footprint and recorded a multi‐instrument set of measurements
Juno measured ∼316 mW/m2 of precipitating electrons while magnetically tied to Ganymede's leading auroral footprint spot
The associated Juno measurements suggest that it transited through a region linked to the transhemispheric electron beam
Details
- Title: Subtitle
- A Comprehensive Set of Juno In Situ and Remote Sensing Observations of the Ganymede Auroral Footprint
- Creators
- V. Hue - Southwest Research InstituteJ. R. Szalay - Princeton UniversityT. K. Greathouse - Southwest Research InstituteB. Bonfond - University of LiègeS. Kotsiaros - DTUC. K. Louis - Dublin Institute For Advanced StudiesA. H. Sulaiman - University of IowaG. Clark - Johns Hopkins University Applied Physics LaboratoryF. Allegrini - Southwest Research InstituteG. R. Gladstone - Southwest Research InstituteC. Paranicas - Johns Hopkins University Applied Physics LaboratoryM. H. Versteeg - Southwest Research InstituteA. Mura - Institute for Space Astrophysics and PlanetologyA. Moirano - Institute for Space Astrophysics and PlanetologyD. J. Gershman - Goddard Space Flight CenterS. J. Bolton - Southwest Research InstituteJ. E. P. Connerney - Goddard Space Flight CenterM. W. Davis - Southwest Research InstituteR. W. Ebert - Southwest Research InstituteJ.‐C. Gérard - Université de LiègeR. S. Giles - Southwest Research InstituteD. C. Grodent - University of LiègeM. Imai - National Institute of Technology, Niihama CollegeJ. A. Kammer - Southwest Research InstituteW. S. Kurth - University of IowaL. Lamy - Observatoire de ParisB. H. Mauk - Johns Hopkins University Applied Physics Laboratory
- Resource Type
- Journal article
- Publication Details
- Geophysical research letters, Vol.49(7), pp.e2021GL096994-n/a
- DOI
- 10.1029/2021GL096994
- ISSN
- 0094-8276
- eISSN
- 1944-8007
- Number of pages
- 11
- Grant note
- University of Iowa (UI) (699041X) Belgian Federal Science Policy Office (BELSPO) (PRODEX) Science Foundation Ireland (SFI) (18/FRL/6199) JPL (New Frontiers Program) MEXT | Japan Society for the Promotion of Science (JSPS) (JP20K22371) CNES and CNRS/INSU programs of planetology and heliophysics. (N/A)
- Language
- English
- Date published
- 04/16/2022
- Academic Unit
- Physics and Astronomy; University College Courses
- Record Identifier
- 9984455555002771
Metrics
14 Record Views