In situ observation of decametric Jovian radio sources with Juno: comparison with simultaneous radio, electron and UV data

Since the discovery of the jovian auroral radio emissions, the position of the different radio source components (broadband kilometric (bKOM), hectometric (HOM) and decametric (DAM)) and their association with far ultraviolet (FUV) auroral emissions have been discussed extensively. We recently surveyed Juno’s first fifteen perijoves to track local radio sources from Juno/Waves in situ measurements (50 Hz–40 MHz). We conclude that the bKOM, HOM and DAM radio sources are located at different altitudes on the same magnetic field lines, with M-shell ranging from 10 to 62. Comparisons with the Jovian FUV auroral images simultaneously acquired by the Hubble Space Telescope (HST) reveals a partial spatial colocation between the FUV emission of the main oval and the radio sources studied here. These work focuses on Juno crossings of DAM sources for which FUV observations (HST/STIS, Juno/UVS), radio (Juno/Waves) and electron (Juno/JADE) measurements weer simultaneously acquired. These allow us to (i) better constrain the source locations, (ii) better understand the link between UV and DAM radio emissions, (iii) obtain the electron distribution function and the electron energy flux involved in the DAM radio emissions and (iv) compare with the theoretical radio emission process known as the Cyclotron Maser Instability.