Juno observations of energetic charged particles over Jupiter's polar regions: Analysis of monodirectional and bidirectional electron beams

B. H. Mauk; D. K. Haggerty; C. Paranicas; G. Clark; P. Kollmann; A. M. Rymer; D. G. Mitchell; S. J. Bolton; S. M. Levin; A. Adriani; F. Allegrini; F. Bagenal; J. E. P. Connerney; G. R. Gladstone; W. S. Kurth; D. J. McComas; D. Ranquist; J. R. Szalay; P. Valek

doi:10.1002/2016GL072286

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Juno observations of energetic charged particles over Jupiter's polar regions: Analysis of monodirectional and bidirectional electron beams

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Juno observations of energetic charged particles over Jupiter's polar regions: Analysis of monodirectional and bidirectional electron beams

B. H. Mauk, D. K. Haggerty, C. Paranicas, G. Clark, P. Kollmann, A. M. Rymer, D. G. Mitchell, S. J. Bolton, S. M. Levin, A. Adriani, …

Geophysical research letters, Vol.44(10), pp.4410-4418

05/28/2017

DOI: 10.1002/2016GL072286

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Abstract

Juno obtained unique low-altitude space environment measurements over Jupiter's poles on 27 August 2016. Here Jupiter Energetic-particle Detector Instrument observations are presented for electrons (25-800 keV) and protons (10-1500 keV). We analyze magnetic field-aligned electron angular beams over expected auroral regions that were sometimes symmetric (bidirectional) but more often strongly asymmetric. Included are variable but surprisingly persistent upward, monodirectional electron angular beams emerging from what we term the "polar cap," poleward of the nominal auroral ovals. The energy spectra of all beams were monotonic and hard (not structured in energy), showing power law-like distributions often extending beyond similar to 800 keV. Given highly variable downward energy fluxes (below 1 R-J altitudes within the loss cone) as high as 280mW/m(2), we suggest that mechanisms generating these beams are among the primary processes generating Jupiter's uniquely intense auroral emissions, distinct from what is typically observed at Earth.

Geology

Geosciences, Multidisciplinary

Physical Sciences

Science & Technology

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Title: Subtitle: Juno observations of energetic charged particles over Jupiter's polar regions: Analysis of monodirectional and bidirectional electron beams
Creators: B. H. Mauk - Johns Hopkins University Applied Physics Laboratory
D. K. Haggerty - Johns Hopkins University Applied Physics Laboratory
C. Paranicas - Johns Hopkins University Applied Physics Laboratory
G. Clark - Johns Hopkins University Applied Physics Laboratory
P. Kollmann - Johns Hopkins University Applied Physics Laboratory
A. M. Rymer - Johns Hopkins University Applied Physics Laboratory
D. G. Mitchell - Johns Hopkins University Applied Physics Laboratory
S. J. Bolton - Southwest Research Institute
S. M. Levin - Jet Propulsion Laboratory
A. Adriani - Institute for Space Astrophysics and Planetology
F. Allegrini - The University of Texas at San Antonio
F. Bagenal - Laboratory for Atmospheric and Space Physics
J. E. P. Connerney - Goddard Space Flight Center
G. R. Gladstone - Southwest Research Institute
W. S. Kurth - University of Iowa
D. J. McComas - Southwest Research Institute
D. Ranquist - Laboratory for Atmospheric and Space Physics
J. R. Szalay - Southwest Research Institute
P. Valek - Southwest Research Institute
Resource Type: Journal article
Publication Details: Geophysical research letters, Vol.44(10), pp.4410-4418
DOI: 10.1002/2016GL072286
ISSN: 0094-8276
eISSN: 1944-8007
Publisher: Amer Geophysical Union
Number of pages: 9
Grant note: NASA New Frontiers Program Southwest Research Institute
Language: English
Date published: 05/28/2017
Academic Unit: Physics and Astronomy
Record Identifier: 9984455269302771

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