Evidence for Magnetic Reconnection at Ganymede's Upstream Magnetopause During the PJ34 Juno Flyby

R. W. Ebert; S. A. Fuselier; F. Allegrini; F. Bagenal; S. J. Bolton; G. Clark; J. E. P. Connerney; G. A. DiBraccio; W. S. Kurth; S. Levin; D. J. McComas; J. Montgomery; N. Romanelli; A. H. Sulaiman; J. R. Szalay; P. Valek; R. J. Wilson

doi:10.1029/2022GL099775

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Evidence for Magnetic Reconnection at Ganymede's Upstream Magnetopause During the PJ34 Juno Flyby

Journal article

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Evidence for Magnetic Reconnection at Ganymede's Upstream Magnetopause During the PJ34 Juno Flyby

R. W. Ebert, S. A. Fuselier, F. Allegrini, F. Bagenal, S. J. Bolton, G. Clark, J. E. P. Connerney, G. A. DiBraccio, W. S. Kurth, S. Levin, …

Geophysical research letters, Vol.49(23), e2022GL099775

12/16/2022

DOI: 10.1029/2022GL099775

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Abstract

Juno made a close flyby of Ganymede and flew through its magnetosphere on 7 June 2021, including an outbound crossing of Ganymede's upstream magnetopause. We present plasma and magnetic field observations near the upstream magnetopause from Juno's Jovian Auroral Distributions Experiment (JADE) and magnetometer. JADE observed enhanced electron fluxes, including field-aligned electrons accelerated up to 2-3 keV/q, some having bidirectional pitch angle distributions, as Juno crossed Ganymede's magnetopause. Energy enhancements of cold protons and heavy ions originating from Ganymede were also observed on approach to the magnetopause. We interpret the presence of accelerated, field-aligned electrons as indicating that magnetic reconnection is occurring on magnetic field lines that connect the spacecraft to Ganymede's magnetopause at that time. Counter-streaming electrons observed on both sides of the magnetopause suggest the presence of multiple reconnection sites, both north and south of the spacecraft.

Geology

Physical Sciences

Geosciences, Multidisciplinary

Science & Technology

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Title: Subtitle: Evidence for Magnetic Reconnection at Ganymede's Upstream Magnetopause During the PJ34 Juno Flyby
Creators: R. W. Ebert - Southwest Research Institute
S. A. Fuselier - Southwest Research Institute
F. Allegrini - Southwest Research Institute
F. Bagenal - Laboratory for Atmospheric and Space Physics
S. J. Bolton - Southwest Research Institute
G. Clark - Johns Hopkins University Applied Physics Laboratory
J. E. P. Connerney - Goddard Space Flight Center
G. A. DiBraccio - Goddard Space Flight Center
W. S. Kurth - University of Iowa
S. Levin - Jet Propulsion Laboratory
D. J. McComas - Princeton University
J. Montgomery - The University of Texas at San Antonio
N. Romanelli - Goddard Space Flight Center
A. H. Sulaiman - University of Iowa
J. R. Szalay - Princeton University
P. Valek - Southwest Research Institute
R. J. Wilson - Laboratory for Atmospheric and Space Physics
Resource Type: Journal article
Publication Details: Geophysical research letters, Vol.49(23), e2022GL099775
DOI: 10.1029/2022GL099775
ISSN: 0094-8276
eISSN: 1944-8007
Publisher: Amer Geophysical Union
Number of pages: 9
Language: English
Date published: 12/16/2022
Academic Unit: Physics and Astronomy
Record Identifier: 9984455276702771

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