Variability and Hemispheric Symmetry of the Pedersen Conductance in the Jovian Aurora

Gérard, Jean-Claude; Gkouvelis, Leonardos; Bonfond, Bertrand; Grodent, Denis; Gladstone, G. R.; Hue, V.; Greathouse, T. K.; Kammer, J. A.; Versteeg, M.; Giles, R. S.

doi:10.1029/2020JA028949

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Variability and Hemispheric Symmetry of the Pedersen Conductance in the Jovian Aurora

Gérard, Jean-Claude; Gkouvelis, Leonardos; Bonfond, Bertrand et al.

2021 • In Journal of Geophysical Research. Space Physics, 126 (4)

Peer reviewed

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https://hdl.handle.net/2268/266384

DOI
10.1029/2020JA028949

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Keywords :

aurora; conductivity; Juno; ionosphere; Jupiter; ultraviolet

Abstract :

[en] Ionospheric conductance contributes to regulate the characteristics of the ionospheric current and the closure of the magnetosphere-ionosphere circuit in the ionosphere. Measurements of Birkeland currents with the Juno magnetometer have indicated that they are statistically larger in the south. It has been suggested that these asymmetries may be the consequence of a higher Pedersen conductance in the southern hemisphere. We have derived the local precipitated electron energy flux and their characteristic energy from 14 multi-spectral images collected with the ultraviolet spectrograph on board Juno. This information was then used as input to an ionospheric model providing the density of H3+, H+, and hydrocarbon ions to calculate the spatial distribution of the Pedersen conductance for Juno perijoves 1–15. We show that the area-integrated conductance is closely proportional to the H3+ ion content and quasi equal in the north and the south. The mean conductance is 0.47 mho in both hemispheres. However, local variations in the Pedersen conductivity and/or hemispheric differences between the magnetospheric rotation and the rotation velocities of the neutrals can also result in asymmetry of Birkeland currents. © 2021. American Geophysical Union. All Rights Reserved.

Research center :

STAR - Space sciences, Technologies and Astrophysics Research - ULiège

Disciplines :

Space science, astronomy & astrophysics

Author, co-author :

Gérard, Jean-Claude ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO)

Gkouvelis, Leonardos ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)

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

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

Gladstone, G. R.

Hue, V.

Greathouse, T. K.

Kammer, J. A.

Versteeg, M.

Giles, R. S.

Language :

English

Title :

Variability and Hemispheric Symmetry of the Pedersen Conductance in the Jovian Aurora

Publication date :

2021

Journal title :

Journal of Geophysical Research. Space Physics

ISSN :

2169-9380

eISSN :

2169-9402

Volume :

126

Issue :

Peer reviewed :

Peer reviewed

Additional URL :

https://www.scopus.com/inward/record.uri?eid=2-s2.0-85104969249&doi=10.1029%2f2020JA028949&partnerID=40&md5=a6f7de4d72c12af4b1790da2e44384fb
https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2020JA028949

Funders :

BELSPO - Belgian Science Policy Office [BE]

Commentary :

e2020JA028949 cited By 1 Scopus

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