In-Situ Observations Connected to the Io Footprint Tail Aurora

J. R. Szalay; Bertrand Bonfond; F. Allegrini; F. Bagenal; S. Bolton; G. Clark; J. E. P. Connerney; R. W. Ebert; R. E. Ergun; G. R. Gladstone; Denis Grodent; G. B. Hospodarsky; V. Hue; W. S. Kurth; S. Kotsiaros; S. M. Levin; P. Louarn; B. Mauk; D. J. Mccomas; J. Saur; P. W. Valek; R. J. Wilson

doi:10.1029/2018JE005752

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In-Situ Observations Connected to the Io Footprint Tail Aurora

Journal article

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Peer reviewed

In-Situ Observations Connected to the Io Footprint Tail Aurora

J. R. Szalay, Bertrand Bonfond, F. Allegrini, F. Bagenal, S. Bolton, G. Clark, J. E. P. Connerney, R. W. Ebert, R. E. Ergun, G. R. Gladstone, …

Journal of Geophysical Research: Planets, Vol.123(11), pp.3061-3077

11/2018

DOI: 10.1029/2018JE005752

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Abstract

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. Peer reviewed

astronomie & astrophysique

astronomy & astrophysics

Aurora

Aérospatiale

Jupiter

Physics

Space Physics

Space science

Details

Title: Subtitle: In-Situ Observations Connected to the Io Footprint Tail Aurora
Creators: J. R. Szalay - Southwest Research Institute
Bertrand Bonfond - University of Liège
F. Allegrini - Southwest Research Institute
F. Bagenal - Laboratory for Atmospheric and Space Physics
S. Bolton - Southwest Research Institute
G. Clark - Johns Hopkins University Applied Physics Laboratory
J. E. P. Connerney - Goddard Space Flight Center
R. W. Ebert - Southwest Research Institute
R. E. Ergun - University of Colorado Boulder
G. R. Gladstone - Southwest Research Institute
Denis Grodent - University of Liège
G. B. Hospodarsky - University of Iowa
V. Hue - Southwest Research Institute
W. S. Kurth - University of Iowa
S. Kotsiaros - Goddard Space Flight Center
S. M. Levin - Jet Propulsion Laboratory
P. Louarn - Institut de Recherche en Astrophysique et Planétologie
B. Mauk - Johns Hopkins University Applied Physics Laboratory
D. J. Mccomas - Southwest Research Institute
J. Saur - University of Cologne
P. W. Valek - Southwest Research Institute
R. J. Wilson - Laboratory for Atmospheric and Space Physics
Resource Type: Journal article
Publication Details: Journal of Geophysical Research: Planets, Vol.123(11), pp.3061-3077
DOI: 10.1029/2018JE005752
ISSN: 2169-9097
eISSN: 2169-9100
Grant note: DOI: 10.13039/100000104, name: National Aeronautics and Space Administration, award: 699050X, 699041X; DOI: 10.13039/501100002749, name: Federaal Wetenschapsbeleid
Language: English
Date published: 11/2018
Academic Unit: Physics and Astronomy
Record Identifier: 9984455285202771

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