Juno Magnetometer Observations at Ganymede: Comparisons With a Global Hybrid Simulation and Indications of Magnetopause Reconnection

N. Romanelli; G. A. DiBraccio; R. Modolo; J. E. P. Connerney; R. W. Ebert; Y. M. Martos; T. Weber; J. R. Espley; W. S. Kurth; F. Allegrini; P. Valek; S. J. Bolton

doi:10.1029/2022GL099545

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Juno Magnetometer Observations at Ganymede: Comparisons With a Global Hybrid Simulation and Indications of Magnetopause Reconnection

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Juno Magnetometer Observations at Ganymede: Comparisons With a Global Hybrid Simulation and Indications of Magnetopause Reconnection

N. Romanelli, G. A. DiBraccio, R. Modolo, J. E. P. Connerney, R. W. Ebert, Y. M. Martos, T. Weber, J. R. Espley, W. S. Kurth, F. Allegrini, …

Geophysical research letters, Vol.49(23), e2022GL099545

12/16/2022

DOI: 10.1029/2022GL099545

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Abstract

Juno's flyby of Ganymede on 7 June 2021, provides a unique opportunity to explore the moon's magnetosphere. By means of Magnetometer (MAG) observations and a hybrid numerical simulation, we provide a global description of this environment and analyze the upstream magnetopause in detail. In particular, LATMOS Hybrid Simulation results suggest Juno observed open (one foot-point connected to Ganymede, the other to Jupiter) and closed magnetic field lines along its trajectory. Additionally, we determine that the upstream magnetopause location and orientation seen by Juno MAG are consistent with previous Galileo observations. We observe a non-zero normal component of the magnetic field across the magnetopause, along with flux rope structures embedded within the boundary's current sheet. Both signatures are strong indicators that magnetic reconnection was occurring along Ganymede's magnetopause. Based on this crossing, we calculate a shear angle of similar to 78 degrees across the magnetopause, with a dimensionless reconnection rate of similar to 0.12.

Geology

Physical Sciences

Geosciences, Multidisciplinary

Science & Technology

Details

Title: Subtitle: Juno Magnetometer Observations at Ganymede: Comparisons With a Global Hybrid Simulation and Indications of Magnetopause Reconnection
Creators: N. Romanelli - University of Maryland, College Park
G. A. DiBraccio - Goddard Space Flight Center
R. Modolo - Laboratoire atmosphères, milieux, observations spatiales
J. E. P. Connerney - Goddard Space Flight Center
R. W. Ebert - Southwest Research Institute
Y. M. Martos - Goddard Space Flight Center
T. Weber - Goddard Space Flight Center
J. R. Espley - Goddard Space Flight Center
W. S. Kurth - University of Iowa
F. Allegrini - Southwest Research Institute
P. Valek - Southwest Research Institute
S. J. Bolton - Southwest Research Institute
Resource Type: Journal article
Publication Details: Geophysical research letters, Vol.49(23), e2022GL099545
DOI: 10.1029/2022GL099545
ISSN: 0094-8276
eISSN: 1944-8007
Publisher: Amer Geophysical Union
Number of pages: 10
Grant note: 80GSFC21M0002; 699041X / NASA; National Aeronautics & Space Administration (NASA) "Soleil-Heliosphere-Magnetospheres" program of the French Space Agency CNES IPSL data center CICLAD ANR-17-CE31-0016 / ANR-CNRS; Agence Nationale de la Recherche (ANR); Centre National de la Recherche Scientifique (CNRS) Southwest Research Institute
Language: English
Date published: 12/16/2022
Academic Unit: Physics and Astronomy
Record Identifier: 9984455261502771

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