Jupiter's Double-Arc Aurora as a Signature of Magnetic Reconnection: Simultaneous Observations From HST and Juno

Guo, Ruilong; Yao, Zhonghua; Grodent, Denis; Bonfond, Bertrand; Clark, G.; Dunn, W. R.; Palmaerts, Benjamin; Mauk, B. H.; Vogt, M. F.; Shi, Q. Q.; Wei, Yelu; Connerney, J. E. P.; Bolton, S. J.

doi:10.1029/2021GL093964

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Jupiter's Double-Arc Aurora as a Signature of Magnetic Reconnection: Simultaneous Observations From HST and Juno

Guo, Ruilong; Yao, Zhonghua; Grodent, Denis et al.

2021 • In Geophysical Research Letters, 48 (14), p. 93964

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Keywords :

Jupiter; aurora; reconnection; Juno; HST

Abstract :

[en] Jupiter's powerful auroral emission is usually divided into the polar, main, and equatorward components. The driver of Jupiter's main aurora is a central question for the community. Previous investigations reveal many distinct substructures on the main auroral oval, which are indicators of fundamentally different magnetospheric processes. Understanding these substructures could provide key constraints for uncovering the driver of Jupiter's main aurora emission. In this study, we show the evolution of a double-auroral arc on the dawnside from observations by the Hubble Space Telescope (HST). Simultaneous in situ observations from the Juno spacecraft provide direct evidence of magnetic reconnection and magnetic dipolarization. By analyzing the datasets from Juno and HST, we suggest that the evolution of the double-arc structure is likely a consequence of the non-steady progress of magnetic reconnection.

Research Center/Unit :

STAR - Space sciences, Technologies and Astrophysics Research - ULiège

Disciplines :

Space science, astronomy & astrophysics

Author, co-author :

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

Yao, Zhonghua ; 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)

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

Clark, G.

Dunn, W. R.

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

Mauk, B. H.

Vogt, M. F.

Shi, Q. Q.

More authors (3 more)

Language :

English

Title :

Jupiter's Double-Arc Aurora as a Signature of Magnetic Reconnection: Simultaneous Observations From HST and Juno

Publication date :

2021

Journal title :

Geophysical Research Letters

ISSN :

0094-8276

eISSN :

1944-8007

Publisher :

Wiley, Washington, United States - District of Columbia

Volume :

Issue :

Pages :

e93964

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2021GL093964

Funders :

BELSPO - Politique scientifique fédérale
F.R.S.-FNRS - Fonds de la Recherche Scientifique
IPD-STEMA

Commentary :

Plain Language Summary Jupiter's most powerful aurora reflects the strong perturbations of energetic particles in the space environment. Besides the relatively steady main aurora, there are rapidly evolving structures that imply the transient plasma processes, for example, magnetic reconnection, wave-particle interaction, and so on. The relation between transient processes and auroral structures is poorly understood due to limited observations. Using the simultaneous measures from Juno and Hubble Space Telescope, we reveal the magnetospheric driver (i.e., magnetic reconnection) for an evolving double-arc auroral structure at the dawn sector. This study shows a good example of reconnection signature on the auroral image, which provides key implications to understand planetary space environment from dynamic auroral features.

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