Io's Effect on Energetic Charged Particles as Seen in Juno Data

C. Paranicas, B. H. Mauk, D. K. Haggerty, G. Clark, P. Kollmann, A. M. Rymer, J. Westlake, R. C. Allen, J. Szalay, R. W. Ebert, A. H. Sulaiman, M. Imai, E. Roussos, N. Krupp, Q. Nénon, F. Bagenal, S. J. Bolton

Research output: Contribution to journalArticlepeer-review

14 Scopus citations


On 12 February 2019, the Juno spacecraft crossed the particle drift shells (L shells) of the moon Io. The energetic particle detector, Jupiter Energetic Particle Detector Instrument (JEDI), found very low fluxes of energetic protons when the spacecraft was inward of about L~6.5. Recent modeling suggests wave-particle interactions may explain why energetic proton fluxes measured at these radial distances are low. JEDI also measured both a wide and a narrow decrease in the energetic electron count rate in Io's wake. At the time of this decrease, the JEDI detectors were dominated by 0.42 to 10-MeV electrons. The dimensions of the narrow count rate decrease are about three Io diameters and are unlikely to be caused by absorption by moon itself.

Original languageEnglish (US)
Pages (from-to)13615-13620
Number of pages6
JournalGeophysical Research Letters
Issue number23
StatePublished - Dec 16 2019

All Science Journal Classification (ASJC) codes

  • Geophysics
  • General Earth and Planetary Sciences


  • energetic charged particles
  • Io
  • Juno


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