Plasma environment at the dawn flank of Jupiter's magnetosphere: Juno arrives at Jupiter

D. J. McComas; J. R. Szalay; F. Allegrini; F. Bagenal; J. Connerney; R. W. Ebert; W. S. Kurth; P. Louarn; B. Mauk; M. Reno; M. F. Thomsen; P. Valek; S. Weidner; R. J. Wilson; S. Bolton

doi:10.1002/2017GL072831

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Plasma environment at the dawn flank of Jupiter's magnetosphere: Juno arrives at Jupiter

Journal article

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Plasma environment at the dawn flank of Jupiter's magnetosphere: Juno arrives at Jupiter

D. J. McComas, J. R. Szalay, F. Allegrini, F. Bagenal, J. Connerney, R. W. Ebert, W. S. Kurth, P. Louarn, B. Mauk, M. Reno, …

Geophysical research letters, Vol.44(10), pp.4432-4438

05/28/2017

DOI: 10.1002/2017GL072831

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Abstract

This study examines the first observations from the Jovian Auroral Distributions Experiment (JADE) as the Juno spacecraft arrived at Jupiter. JADE observations show that Juno crossed the bow shock at 08:16 UT on 2016 day of year (DOY) 176 and magnetopause at 21:20 on DOY 177, with additional magnetopause encounters until 23:39 on DOY 181. JADE made the first detailed observations of the plasma environment just inside the dawn flank of the magnetopause. We find subcorotational ions and variable electron beaming, with multiple flux tubes of varying plasma properties. Ion composition shows a dearth of heavy ions; protons dominate the plasma, with only intermittent, low fluxes of O+/S++, along with traces of O++ and S+++. We also find very little H-3(+) or He+, which are expected for an ionospheric plasma source. A few heavy ion bursts occur when the radial field nears reversal, but many other such reversals are not accompanied by heavy ions.

Geology

Physical Sciences

Geosciences, Multidisciplinary

Science & Technology

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Title: Subtitle: Plasma environment at the dawn flank of Jupiter's magnetosphere: Juno arrives at Jupiter
Creators: D. J. McComas - Princeton University
J. R. Szalay - Southwest Research Institute
F. Allegrini - Southwest Research Institute
F. Bagenal - Laboratory for Atmospheric and Space Physics
J. Connerney - Goddard Space Flight Ctr, Greenbelt, MD USA
R. W. Ebert - Southwest Research Institute
W. S. Kurth - University of Iowa
P. Louarn - Institut de Recherche en Astrophysique et Planétologie
B. Mauk - Johns Hopkins University Applied Physics Laboratory
M. Reno
M. F. Thomsen - Planetary Science Institute
P. Valek - Southwest Research Institute
S. Weidner - Princeton Plasma Physics Laboratory
R. J. Wilson - Laboratory for Atmospheric and Space Physics
S. Bolton - Southwest Research Institute
Resource Type: Journal article
Publication Details: Geophysical research letters, Vol.44(10), pp.4432-4438
DOI: 10.1002/2017GL072831
ISSN: 0094-8276
eISSN: 1944-8007
Publisher: Amer Geophysical Union
Number of pages: 7
Grant note: ST/P000541/1 / Science and Technology Facilities Council; UK Research & Innovation (UKRI); Science & Technology Facilities Council (STFC) ST/P000541/1 / STFC; UK Research & Innovation (UKRI); Science & Technology Facilities Council (STFC)
Language: English
Date published: 05/28/2017
Academic Unit: Physics and Astronomy
Record Identifier: 9984455278202771

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