Dawn-dusk asymmetry in the main auroral emissions at Jupiter observed with Juno-UVS

[en] Jupiter's main auroral emissions usually form auroral curtains surrounding the magnetic poles. Most explanations for this auroral feature are based on corotation enforcement currents flowing between the magnetosphere and the ionosphere. This process predicts the highest emitted power to originate from the dawn region, while the lowest emitted power would come from the noon to dusk region. However, a previous study using Hubble Space Telescope data showed the opposite, with a higher emitted power in the dusk region in the south and ambiguous results in the north. In the present study, we use data from the first 39 Juno perijoves to reexamine this question. We find a dusk region 2.9 to 5.5 times more powerful than the dawn one, in qualitative agreement with the previous study but contrary to theoretical expectations. These results support the idea that the main emissions cannot be fully described by corotation enforcement currents.

Research center :

STAR - Space sciences, Technologies and Astrophysics Research - ULiège [BE]

Disciplines :

Space science, astronomy & astrophysics

Author, co-author :

Groulard, Antoine ; Université de Liège - ULiège > Unités de recherche interfacultaires > Space sciences, Technologies and Astrophysics Research (STAR)

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

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

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

Greathouse, T.K.

Hue, V.

Gladstone, G.R.

Versteeg, M.H.

Language :

English

Title :

Dawn-dusk asymmetry in the main auroral emissions at Jupiter observed with Juno-UVS

Publication date :

February 2024

Journal title :

Icarus

ISSN :

0019-1035

eISSN :

1090-2643

Publisher :

Elsevier BV

Pages :

116005

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

https://api.elsevier.com/content/article/PII:S0019103524000630?httpAccept=text/xml

Funders :

NASA - National Aeronautics and Space Administration [US-DC]
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]

Data Set :

https://pds-atmospheres.nmsu.edu/cgi-bin/getdir.pl?dir=DATA&volume=jnouvs_3001

The data used in this work are publicly available

Available on ORBi :

since 22 February 2024

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