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Juno Plasma Wave Observations at Ganymede
  • +14
  • William S Kurth,
  • Ali H. Sulaiman,
  • George Blair Hospodarsky,
  • John Douglas Menietti,
  • Barry H. Mauk,
  • George Clark,
  • Frederic Allegrini,
  • Philip Valek,
  • John E. P. Connerney,
  • Jack Hunter Waite,
  • Scott J Bolton,
  • Masafumi Imai,
  • Ondrej Santolik,
  • Wen Li,
  • Stefan Duling,
  • Joachim Saur,
  • Corentin Kenelm Louis
William S Kurth
University of Iowa, University of Iowa

Corresponding Author:[email protected]

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Ali H. Sulaiman
University of Iowa, University of Iowa
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George Blair Hospodarsky
University of Iowa, University of Iowa
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John Douglas Menietti
University of Iowa, University of Iowa
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Barry H. Mauk
Johns Hopkins University, Johns Hopkins University
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George Clark
Johns Hopkins University Applied Physics Laboratory, Johns Hopkins University Applied Physics Laboratory
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Frederic Allegrini
Southwest Research Institute, Southwest Research Institute
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Philip Valek
Southwest Research Institute, Southwest Research Institute
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John E. P. Connerney
NASA Goddard Space Flight Center, NASA Goddard Space Flight Center
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Jack Hunter Waite
Southwest Research Institute, Southwest Research Institute
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Scott J Bolton
Southwest Research Institute, Southwest Research Institute
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Masafumi Imai
University of Iowa, University of Iowa
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Ondrej Santolik
Department of Space Physics, Institute of Atmospheric Physics of the Czech Academy of Sciences, Department of Space Physics, Institute of Atmospheric Physics of the Czech Academy of Sciences
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Wen Li
Boston University, Boston University
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Stefan Duling
University of Cologne, University of Cologne
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Joachim Saur
University of Cologne, University of Cologne
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Corentin Kenelm Louis
Dublin Institute for Advanced Studies (DIAS), Dublin Institute for Advanced Studies (DIAS)
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Abstract

The Juno Waves instrument measured plasma waves associated with Ganymede’s magnetosphere during its flyby on 7 June, day 158, 2021. Three distinct regions were identified including a wake, and nightside and dayside regions in the magnetosphere distinguished by their electron densities and associated variability. The magnetosphere includes electron cyclotron harmonic emissions including a band at the upper hybrid frequency, as well as whistler-mode chorus and hiss. These waves likely interact with energetic electrons in Ganymede’s magnetosphere by pitch angle scattering and/or accelerating the electrons. The wake is accentuated by low-frequency turbulence and electrostatic solitary waves. Radio emissions observed before and after the flyby likely have their source in Ganymede’s magnetosphere.