Field Line Resonances in Jupiter's Magnetosphere

Research output: Contribution to journalArticlepeer-review

Abstract

The arrival of the Juno satellite at Jupiter has led to an increased interest in the dynamics of the Jovian magnetosphere. Jupiter's auroral emissions often exhibit quasiperiodic oscillations with periods of tens of minutes. Magnetic observations indicate that ultralow-frequency (ULF) waves with similar periods are often seen in data from Galileo and other satellites traversing the Jovian magnetosphere. Such waves can be associated with field line resonances, which are standing shear Alfvén waves on the field lines. Using model magnetic fields and plasma distributions, the frequencies of field line resonances and their harmonics on field lines connecting to the main auroral oval have been determined. Time domain simulations of Alfvén wave propagation have illustrated the evolution of such resonances. These studies indicate that harmonics of the field line resonances are common in the 10–40 min band.

Original languageEnglish (US)
Article numbere2020GL089473
JournalGeophysical Research Letters
Volume47
Issue number18
DOIs
StatePublished - Sep 28 2020

Bibliographical note

Funding Information:
We would like to thank Fran Bagenal for useful comments on this work. Work at the University of Minnesota is supported by Grant AGS‐1840891 from the National Science Foundation. We also acknowledge supercomputer support from the Minnesota Supercomputer Institute.

Publisher Copyright:
©2020. American Geophysical Union. All Rights Reserved.

Keywords

  • Jupiter
  • field line resonances
  • magnetic modeling
  • quasi-periodic oscillations

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