  At Jupiter, part of the auroral radio emissions are induced by the Galilean
moons Io, Europa and Ganymede. Until now, except for Ganymede, they have been
only 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 range of magnetic flux tubes which sustain the various
Jupiter-satellite interactions, and in turn to sample in situ the associated
radio emission regions. In this study, we focus on the detection and the
characterization of radio sources associated with Io, Europa and Ganymede.
Using electric wave measurements or radio observations (Juno/Waves), in situ
electron measurements (Juno/JADE-E), and magnetic field measurements (Juno/MAG)
we demonstrate that the Cyclotron Maser Instability (CMI) driven by a loss-cone
electron distribution function is responsible for the encountered radio
sources. We confirmed that radio emissions are associated with Main (MAW) or
Reflected Alfv\'en Wing (RAW), but also show that for Europa and Ganymede,
induced radio emissions are associated with Transhemispheric Electron Beam
(TEB). For each traversed radio source, we determine the latitudinal extension,
the CMI-resonant electron energy, and the bandwidth of the emission. We show
that the presence of Alfv\'en perturbations and downward field aligned currents
are necessary for the radio emissions to be amplified.
