Europa modifies Jupiter’s 1 plasma sheet

Szalary, J. R.; Saur, J.; McComas, D. J.; Allegrini, F.; Bagenal, F.; Bolton, S. J.; Ebert, R. W.; Kim, Kyoung Ho; Livadiotis, G.; Poppe, A. R.; Valek, P.; Wilson, R. J.; Zirnstein, E. J.

doi:10.1029/2023GL105809

Title: Europa modifies Jupiter’s 1 plasma sheet

Journal Article · 18 March 2024 · Geophysical Research Letters

DOI: https://doi.org/10.1029/2023GL105809 · OSTI ID:2426747

Szalary, J. R. ^[1]; Saur, J. ^[2]; McComas, D. J. ^[1]; Allegrini, F. ^[3]; Bagenal, F. ^[4]; Bolton, S. J. ^[3]; Ebert, R. W. ^[3];

^[5]; Livadiotis, G. ^[1]; Poppe, A. R. ^[6]; Valek, P. ^[3]; Wilson, R. J. ^[7]; Zirnstein, E. J. ^[1]

Princeton Univ., NJ (United States)
Univ. of Cologne (Germany)
Southwest Research Institute, San Antonio, TX (United States)
Laboratory for Atmospheric and Space Physics
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
University of California, Berkeley, CA (United States)
Univ. of Colorado, Boulder, CO (United States)

Jupiter's plasma sheet has been understood to be primarily composed of Io-genic sulfur and oxygen, along with protons at lower mass density. These ions move radially away from Jupiter, filling its magnetosphere. The material in the plasma sheet interacts with Europa, which is also a source of magnetospheric pickup ions, primarily hydrogen and oxygen. Juno's thermal plasma instrument JADE, the Jovian Auroral Distributions Experiment, has provided comprehensive in situ observations of the composition of Jupiter's plasma sheet ions with its Time-of-Flight mass-spectrometry capabilities. Here, we present observations of the magnetospheric composition in the Europa-Ganymede region of Jupiter's magnetosphere. We find material from Europa is intermittently present at comparable densities to Io-genic plasma. The intermittency of Europa-genic signatures suggests Europa's neutral oxygen toroidal cloud is more localized to Europa's vicinity than its hydrogen cloud. These observations reveal a more complex and compositionally diverse magnetosphere than previously thought.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE; National Aeronautics and Space Administration (NASA)

Grant/Contract Number:: 89233218CNA000001

OSTI ID:: 2426747

Report Number(s):: LA-UR--23-30560

Journal Information:: Geophysical Research Letters, Journal Name: Geophysical Research Letters Journal Issue: 6 Vol. 51; ISSN 0094-8276

Publisher:: American Geophysical Union (AGU)Copyright Statement

Country of Publication:: United States

Language:: English

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