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By analysing a database of 26 years of observations of Jupiter with theNancay Decameter Array, we unambiguously identify the radio emissions caused bythe Ganymede-Jupiter interaction. We study the energetics of these emissionsvia the distributions of their intensities, duration, and power, and comparethem to the energetics of the Io-Jupiter radio emissions. This allows us todemonstrate that the average emitted radio power is proportional to thePoynting flux from the rotating Jupiter's magnetosphere intercepted by theobstacle. We then generalize this result to the radio-magnetic scaling law thatappears to apply to all plasma interactions between a magnetized flow and anobstacle, magnetized or not. Extrapolating this scaling law to the parameterrange corresponding to hot Jupiters, we predict large radio powers emitted bythese objects, that should result in detectable radio flux with new-generationradiotelescopes. Comparing the distributions of the durations ofGanymede-Jupiter and Io-Jupiter emission events also suggests that while thelatter results from quasi-permanent Alfven wave excitation by Io, the formerlikely results from sporadic reconnection between magnetic fields Ganymede andJupiter, controlled by Jupiter's magnetic field geometry and modulated by itsrotation.

Jupiter radio emission induced by Ganymede and consequences for the radio detection of exoplanets