The Io, Europa, and Ganymede Auroral Footprints at Jupiter in the Ultraviolet: Positions and Equatorial Lead Angles

Alfvenic interaction; Jupiter decametric emission; Jupiter magnetosphere; moon-magnetosphere interaction; satellite footprint; UV-aurora; Geophysics; Space and Planetary Science; astro-ph.EP

Abstract :

[en] Jupiter's satellite auroral footprints are a consequence of the interaction between the Jovian magnetic field with co-rotating iogenic plasma and the Galilean moons. The disturbances created near the moons propagate as Alfvén waves along the magnetic field lines. The position of the moons is therefore “Alfvénically” connected to their respective auroral footprint. The angular separation from the instantaneous magnetic footprint can be estimated by the so-called lead angle. That lead angle varies periodically as a function of orbital longitude, since the time for the Alfvén waves to reach the Jovian ionosphere varies accordingly. Using spectral images of the Main Alfvén Wing auroral spots collected by Juno-UVS during the first 43 orbits, this work provides the first empirical model of the Io, Europa, and Ganymede equatorial lead angles for the northern and southern hemispheres. Alfvén travel times between the three innermost Galilean moons to Jupiter's northern and southern hemispheres are estimated from the lead angle measurements. We also demonstrate the accuracy of the mapping from the Juno magnetic field reference model (JRM33) at the completion of the prime mission for M-shells extending to at least 15 RJ. Finally, we shows how the added knowledge of the lead angle can improve the interpretation of the moon-induced decametric emissions.

Research Center/Unit :

STAR - Space sciences, Technologies and Astrophysics Research - ULiège

Disciplines :

Earth sciences & physical geography

Author, co-author :

Hue, Vincent ; Aix-Marseille Université, CNRS, CNES, Institut Origines, LAM, Marseille, France ; Southwest Research Institute, San Antonio, United States

Gladstone, G.R. ; Southwest Research Institute, San Antonio, United States ; University of Texas at San Antonio, San Antonio, United States

Louis, Corentin K. ; School of Cosmic Physics, DIAS Dunsink Observatory, Dublin Institute for Advanced Studies, Dublin, Ireland

Greathouse, Thomas K. ; Southwest Research Institute, San Antonio, United States

Bonfond, Bertrand ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)

Szalay, Jamey R. ; Department of Astrophysical Sciences, Princeton University, Princeton, United States

Moirano, Alessandro ; Institute for Space Astrophysics and Planetology, National Institute for Astrophysics, Rome, Italy ; Sapienza University of Rome, Rome, Italy

Giles, Rohini S. ; Southwest Research Institute, San Antonio, United States

Kammer, Joshua A. ; Southwest Research Institute, San Antonio, United States

Imai, Masafumi ; Department of Electrical Engineering and Information Science, National Institute of Technology (KOSEN), Niihama College, Niihama, Japan

More authors (9 more)

Language :

English

Title :

The Io, Europa, and Ganymede Auroral Footprints at Jupiter in the Ultraviolet: Positions and Equatorial Lead Angles

Publication date :

May 2023

Journal title :

Journal of Geophysical Research. Space Physics

ISSN :

2169-9380

eISSN :

2169-9402

Publisher :

John Wiley and Sons Inc

Volume :

128

Issue :

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

https://agupubs.onlinelibrary.wiley.com/doi/am-pdf/10.1029/2023JA031363

Funders :

NASA - National Aeronautics and Space Administration
SFI - Science Foundation Ireland
AMU - Aix-Marseille University
F.R.S.-FNRS - Fonds de la Recherche Scientifique

Funding text :

We are grateful to NASA and contributing institutions that have made the Juno mission possible. This work was funded by the NASA's New Frontiers Program for Juno via contract NNM06AA75C with the Southwest Research Institute. CKL's work at the Dublin Institute for Advanced Studies was funded by Science Foundation Ireland Grant 18/FRL/6199. AHS acknowledges NASA NFDAP Grant 80NSSC23K0276. Hue acknowledges support from the French government under the France 2030 investment plan, as part of the Initiative d’Excellence d’Aix-Marseille Université – A*MIDEX AMX-22-CPJ-04.We are grateful to NASA and contributing institutions that have made the Juno mission possible. This work was funded by the NASA's New Frontiers Program for Juno via contract NNM06AA75C with the Southwest Research Institute. CKL's work at the Dublin Institute for Advanced Studies was funded by Science Foundation Ireland Grant 18/FRL/6199. AHS acknowledges NASA NFDAP Grant 80NSSC23K0276. Hue acknowledges support from the French government under the France 2030 investment plan, as part of the Initiative d’Excellence d’Aix‐Marseille Université – A*MIDEX AMX‐22‐CPJ‐04.

Commentary :

20 pages, 8 figures, Accepted for publication in Journal of Geophysical Research: Space Physics on 20 April 2023

Available on ORBi :

since 16 June 2023

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