Energetic particle signatures of magnetic field-aligned potentials over Jupiter's polar regions: Jovian Polar Acceleration Region

G. Clark; B. H. Mauk; D. Haggerty; C. Paranicas; P. Kollmann; A. Rymer; E. J. Bunce; S. W. H. Cowley; D. G. Mitchell; G. Provan; R. W. Ebert; F. Allegrini; F. Bagenal; S. Bolton; J. Connerney; S. Kotsiaros; W. S. Kurth; S. Levin; D. J. McComas; J. Saur; P. Valek

doi:10.1002/2017GL074366

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Energetic particle signatures of magnetic field-aligned potentials over Jupiter's polar regions: Jovian Polar Acceleration Region

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Energetic particle signatures of magnetic field-aligned potentials over Jupiter's polar regions: Jovian Polar Acceleration Region

G. Clark, B. H. Mauk, D. Haggerty, C. Paranicas, P. Kollmann, A. Rymer, E. J. Bunce, S. W. H. Cowley, D. G. Mitchell, G. Provan, …

Geophysical research letters, Vol.44(17), pp.8703-8711

09/16/2017

DOI: 10.1002/2017GL074366

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Abstract

Recent results of the first ever orbit through Jupiter's auroral region by NASA's Juno spacecraft did not show evidence of coherent acceleration in the auroral or polar region. However, in this letter, we show energetic particle data from Juno's Jupiter Energetic-particle Detector Instrument instrument during the third auroral pass that exhibits conclusive evidence of downward parallel electric fields in portions of Jupiter's polar region. The energetic particle distributions show inverted-V ion and electron structures in a downward electric current region with accelerated peaked distributions in hundreds of keV to ~1 MeV range. The origin of these large electric potential structures is investigated and discussed within the current theoretical framework of current-voltage relationships at both Earth and Jupiter. Parallel electric fields responsible for accelerating particles to maintain the aurora/magnetospheric circuit appear to be a common phenomenon among strongly magnetized planets with conducting ionospheres; however, their origin and generation mechanisms are subjects of ongoing research.

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Title: Subtitle: Energetic particle signatures of magnetic field-aligned potentials over Jupiter's polar regions: Jovian Polar Acceleration Region
Creators: G. Clark - Johns Hopkins University Applied Physics Laboratory
B. H. Mauk - Johns Hopkins University Applied Physics Laboratory
D. Haggerty - Johns Hopkins University Applied Physics Laboratory
C. Paranicas - Johns Hopkins University Applied Physics Laboratory
P. Kollmann - Johns Hopkins University Applied Physics Laboratory
A. Rymer - Johns Hopkins University Applied Physics Laboratory
E. J. Bunce - University of Leicester
S. W. H. Cowley - University of Leicester
D. G. Mitchell - Johns Hopkins University Applied Physics Laboratory
G. Provan - University of Leicester
R. W. Ebert - Southwest Research Institute
F. Allegrini - Southwest Research Institute
F. Bagenal - Laboratory for Atmospheric and Space Physics
S. Bolton - Southwest Research Institute
J. Connerney
S. Kotsiaros - Goddard Space Flight Center
W. S. Kurth - University of Iowa
S. Levin - Jet Propulsion Laboratory
D. J. McComas - Southwest Research Institute
J. Saur - University of Cologne
P. Valek - Southwest Research Institute
Resource Type: Journal article
Publication Details: Geophysical research letters, Vol.44(17), pp.8703-8711
DOI: 10.1002/2017GL074366
ISSN: 0094-8276
eISSN: 1944-8007
Language: English
Date published: 09/16/2017
Academic Unit: Physics and Astronomy
Record Identifier: 9984455265202771

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