Alfvénic Acceleration Sustains Ganymede's Footprint Tail Aurora

Szalay, Jamey R.; Allegrini, Frederic; Bagenal, Fran; Bolton, Scott J.; Bonfond, Bertrand; Clark, George; Connerney, John E. P.; Ebert, Robert W.; Gershman, Daniel J.; Giles, Rohini S.; Gladstone, Randy; Greathouse, Thomas; Hospodarsky, George Blair; Imai, Masafumi; Kurth, William S.; Kotsiaros, Stavros; Louarn, Philippe; McComas, David J.; Saur, Joachim; Sulaiman, Ali H.; Wilson, Robert J.

doi:10.1029/2019GL086527

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Alfvénic Acceleration Sustains Ganymede's Footprint Tail Aurora

Szalay, Jamey R.; Allegrini, Frederic; Bagenal, Fran et al.

2020 • In Geophysical Research Letters, 47 (3), p. 2019GL086527

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https://hdl.handle.net/2268/243865

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10.1029/2019GL086527

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Keywords :

Juno; JADE; Ganymede footprint

Abstract :

[en] Integrating simultaneous in-situ measurements of magnetic field fluctuations, precipitating electrons, and ultraviolet auroral emissions, we find that Alfvénic acceleration mechanisms are responsible for Ganymede's auroral footprint tail. Magnetic field perturbations exhibit enhanced Alfvénic activity with Poynting fluxes of 100 mW/m2. These perturbations are capable of accelerating the observed broadband electrons with precipitating fluxes of 11 mW/m2, such that Alfvénic power is transferred to electron acceleration with 10 efficiency. The UV emissions are consistent with in-situ electron measurements, indicating 13 ± 3 mW/m2 of precipitating electron flux. Juno crosses flux tubes with both upward and downward currents connected to the auroral tail exhibiting small-scale structure. We identify an upward electron conic in the downward current region, possibly due to acceleration by inertial Alfvén waves near the Jovian ionosphere. In concert with in-situ observations at Io's footprint tail, these results suggest that Alfvénic acceleration processes are universally applicable to magnetosphere-satellite interactions.

Research Center/Unit :

STAR - Space sciences, Technologies and Astrophysics Research - ULiège

Disciplines :

Space science, astronomy & astrophysics

Author, co-author :

Szalay, Jamey R.

Allegrini, Frederic

Bagenal, Fran

Bolton, Scott J.

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

Clark, George

Connerney, John E. P.

Ebert, Robert W.

Gershman, Daniel J.

Giles, Rohini S.

More authors (11 more)

Language :

English

Title :

Alfvénic Acceleration Sustains Ganymede's Footprint Tail Aurora

Publication date :

2020

Journal title :

Geophysical Research Letters

ISSN :

0094-8276

eISSN :

1944-8007

Publisher :

Wiley, Washington, United States - District of Columbia

Volume :

Issue :

Pages :

e2019GL086527

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2019GL086527

Funders :

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

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