Article (Scientific journals)
In-Situ Observations Connected to the Io Footprint Tail Aurora
Szalay, J. R.; Bonfond, Bertrand; Allegrini, F. et al.
2018In Journal of Geophysical Research. Planets, 123 (ja)
Peer reviewed
 

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Keywords :
Aurora; Io; Jupiter
Abstract :
[en] The Juno spacecraft crossed flux tubes connected to the Io footprint tail at low Jovian altitudes on multiple occasions. The transits covered longitudinal separations of approximately 10° to 120° along the footprint tail. Juno's suite of magnetospheric instruments acquired detailed measurements of the Io footprint tail. Juno observed planetward electron energy fluxes of 70 mW/m2 near the Io footprint, and 10 mW/m2 farther down the tail, along with correlated, intense electric and magnetic wave signatures which also decreased down the tail. All observed electron distributions were broad in energy, suggesting a dominantly broadband acceleration process, and did not show any inverted-V structure that would be indicative of acceleration by a quasi-static, discrete, parallel potential. Observed waves were primarily below the proton cyclotron frequency, yet identification of a definitive wave mode is elusive. Beyond 40° down the footprint tail, Juno observed depleted upward loss cones, suggesting the broadband acceleration occurred at distances beyond Juno's transit distance of 1.3 to 1.7 RJ. For all transits, Juno observed fine structure on scales of 10s km, and confirmed independently with electron and waves measurements that a bifurcated tail can intermittently exist.
Research center :
STAR - Space sciences, Technologies and Astrophysics Research - ULiège
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Szalay, J. R.
Bonfond, Bertrand  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Allegrini, F.
Bagenal, F.
Bolton, S.
Clark, G.
Connerney, J. E. P.
Ebert, R. W.
Ergun, R. E.
Gladstone, G. R.
Grodent, Denis  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Hospodarsky, G. B.
Hue, V.
Kurth, W. S.
Kotsiaros, S.
Levin, S. M.
Louarn, P.
Mauk, B.
McComas, D. J.
Saur, J.
Valek, P. W.
Wilson, R. J.
More authors (12 more) Less
Language :
English
Title :
In-Situ Observations Connected to the Io Footprint Tail Aurora
Publication date :
October 2018
Journal title :
Journal of Geophysical Research. Planets
ISSN :
2169-9097
eISSN :
2169-9100
Publisher :
Wiley, Hoboken, United States - New Jersey
Volume :
123
Issue :
ja
Peer reviewed :
Peer reviewed
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
BELSPO - SPP Politique scientifique - Service Public Fédéral de Programmation Politique scientifique
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