Radio emission from satellite-Jupiter interactions (especially Ganymede)

TL;DR

This study analyzes 26 years of Jupiter radio emissions to identify satellite-induced signals, especially Ganymede, revealing their occurrence patterns and suggesting possible influences from Europa, Amalthea, and Callisto.

Contribution

It provides the first clear characterization of Ganymede-induced radio emissions and explores potential signals from other Galilean satellites and Amalthea.

Findings

Ganymede induces distinct radio emission intervals in Jupiter's signals.

Hints of Europa and Amalthea-induced emissions were observed.

Callisto's influence on emissions remains inconclusive.

Abstract

Analyzing a database of 26 years of observations of Jupiter from the Nan\c{c}ay Decameter Array, we study the occurrence of Io-independent emissions as a function of the orbital phase of the other Galilean satellites and Amalthea. We identify unambiguously the emissions induced by Ganymede and characterize their intervals of occurrence in CML and Ganymede phase and longitude. We also find hints of emissions induced by Europa and, surprisingly, by Amalthea. The signature of Callisto-induced emissions is more tenuous.