Ganymede-Induced Decametric Radio Emission: In Situ Observations and Measurements by Juno

C. K. Louis, P. Louarn, F. Allegrini, W. S. Kurth, J. R. Szalay

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

At Jupiter, part of the auroral radio emissions are induced by the Galilean moons Io, Europa, and Ganymede. Until now, they have been remotely detected, using ground-based radio telescopes or electric antennas aboard spacecraft. The polar trajectory of the Juno orbiter allows the spacecraft to cross the magnetic flux tubes connected to these moons, or their tail, and gives a direct measure of the characteristics of these decametric moon-induced radio emissions. In this study, we focus on the detection of a radio emission during the crossing of magnetic field lines connected to Ganymede's tail. Using electromagnetic waves (Juno/Waves) and in situ electron measurements (Juno/JADE-E), we estimate the radio source size of ∼250 km, a radio emission growth rate >3 × 10−4, a resonant electron population of energy (Formula presented.) –15 keV and an emission beaming angle of θ = 76–83°, at a frequency ∼1.005–1.021 × fce. We also confirmed that radio emission is associated with Ganymede's downtail far ultraviolet emission.

Original languageEnglish (US)
Article numbere2020GL090021
JournalGeophysical Research Letters
Volume47
Issue number20
DOIs
StatePublished - Oct 28 2020

All Science Journal Classification (ASJC) codes

  • Geophysics
  • General Earth and Planetary Sciences

Keywords

  • auroral radio emission
  • cyclotron maser instability
  • Ganymede-induced radio emission
  • in situ observations and measurements
  • Juno
  • Jupiter

Fingerprint

Dive into the research topics of 'Ganymede-Induced Decametric Radio Emission: In Situ Observations and Measurements by Juno'. Together they form a unique fingerprint.

Cite this