Energetic Charged Particle Observations During Juno's Close Flyby of Ganymede

G. Clark, P. Kollmann, B. H. Mauk, C. Paranicas, D. Haggerty, A. Rymer, H. T. Smith, J. Saur, F. Allegrini, S. Duling, R. W. Ebert, W. S. Kurth, R. Gladstone, T. K. Greathouse, W. Li, F. Bagenal, J. E.P. Connerney, S. Bolton, J. R. Szalay, A. H. SulaimanC. J. Hansen, D. L. Turner

Research output: Contribution to journalArticlepeer-review

15 Scopus citations


On 7 June 2021, NASA's Juno mission obtained unique measurements of Ganymede's magnetosphere during a close flyby that brought the spacecraft within ∼1,000 km of its surface. Here Jupiter Energetic particle Detector Instrument observations are presented and analyzed. The electron pitch angle distributions reveal distinct regions of Ganymede's magnetosphere that can be characterized as inbound and outbound magnetospheric boundaries, a magnetotail/wake region, and Ganymede's open field line region. Evidence for energy dependent electron pitch angle structuring is also documented both outside and within Ganymede's magnetosphere. Electron precipitation is observed and mapped to Ganymede's surface along Juno's magnetic footpoint.

Original languageEnglish (US)
Article numbere2022GL098572
JournalGeophysical Research Letters
Issue number23
StatePublished - Dec 16 2022
Externally publishedYes

Bibliographical note

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© 2022 American Geophysical Union. All Rights Reserved.


  • Ganymede
  • JEDI
  • Juno
  • energetic particles
  • mini-magnetosphere
  • moon-magnetosphere interaction


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