Alternating North‐South Brightness Ratio of Ganymede's Auroral Ovals: Hubble Space Telescope Observations Around the Juno PJ34 Flyby

Saur, Joachim; Duling, Stefan; Wennmacher, Alexandre; Willmes, Clarissa; Roth, Lorenz; Strobel, Darrell F.; Allegrini, Frédéric; Bagenal, Fran; Bolton, Scott J.; Bonfond, Bertrand; Clark, George; Gladstone, Randy; Greathouse, Thomas K.; Grodent, Denis; Hansen, Candice J.; Kurth, William S.; Orton, Glenn S.; Retherford, Kurt D.; Rymer, Abigail M.; Sulaiman, Ali H.

doi:10.1029/2022gl098600

Article (Scientific journals)

Alternating North‐South Brightness Ratio of Ganymede's Auroral Ovals: Hubble Space Telescope Observations Around the Juno PJ34 Flyby

Saur, Joachim; Duling, Stefan; Wennmacher, Alexandre et al.

2022 • In Geophysical Research Letters, 49 (23)

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https://hdl.handle.net/2268/297338

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10.1029/2022gl098600

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Keywords :

General Earth and Planetary Sciences; Geophysics; Ganymede; Juno; Jupiter; Hubble Space Telescope; aurora

Abstract :

[en] We report results of Hubble Space Telescope observations from Ganymede's orbitally trailing side which were taken around the flyby of the Juno spacecraft on 7 June 2021. We find that Ganymede's northern and southern auroral ovals alternate in brightness such that the oval facing Jupiter's magnetospheric plasma sheet is brighter than the other one. This suggests that the generator that powers Ganymede's aurora is the momentum of the Jovian plasma sheet north and south of Ganymede's magnetosphere. Magnetic coupling of Ganymede to the plasma sheet above and below the moon causes asymmetric magnetic stresses and electromagnetic energy fluxes ultimately powering the auroral acceleration process. No clear statistically significant timevariability of the auroral emission on short time scales of 100s could be resolved. We show that electron energy fluxes of several tens of mW m−2 are required for its OI 1,356 Å emission making Ganymede a very poor auroral emitter.

Research Center/Unit :

STAR - Space sciences, Technologies and Astrophysics Research - ULiège

Disciplines :

Space science, astronomy & astrophysics

Author, co-author :

Saur, Joachim ; Institute of Geophysics and Meteorology University of Cologne Cologne Germany

Duling, Stefan ; Institute of Geophysics and Meteorology University of Cologne Cologne Germany

Wennmacher, Alexandre ; Institute of Geophysics and Meteorology University of Cologne Cologne Germany

Willmes, Clarissa ; Institute of Geophysics and Meteorology University of Cologne Cologne Germany

Roth, Lorenz ; School of Electrical Engineering KTH, Royal Institute of Technology Stockholm Sweden

Strobel, Darrell F. ; Johns Hopkins University Baltimore MD USA

Allegrini, Frédéric ; Southwest Research Institute San Antonio TX USA ; Department of Physics and Astronomy University of Texas at San Antonio San Antonio TX USA

Bagenal, Fran ; University of Colorado Boulder CO USA

Bolton, Scott J. ; 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)

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Language :

English

Title :

Alternating North‐South Brightness Ratio of Ganymede's Auroral Ovals: Hubble Space Telescope Observations Around the Juno PJ34 Flyby

Publication date :

12 December 2022

Journal title :

Geophysical Research Letters

ISSN :

0094-8276

eISSN :

1944-8007

Publisher :

American Geophysical Union (AGU)

Volume :

Issue :

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

https://onlinelibrary.wiley.com/doi/pdf/10.1029/2022GL098600

Funders :

F.R.S.-FNRS - Fonds de la Recherche Scientifique

Available on ORBi :

since 14 December 2022

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