Article (Scientific journals)
Alfvénic Acceleration Sustains Ganymede's Footprint Tail Aurora
Szalay, Jamey R.; Allegrini, Frederic; Bagenal, Fran et al.
2020In Geophysical Research Letters, 47 (3), p. 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.
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.
More authors (11 more) Less
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 :
47
Issue :
3
Pages :
e2019GL086527
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique
Available on ORBi :
since 22 January 2020

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