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The narrowband kilometric radiation (nKOM) is a Jovian low-frequency radiocomponent identified as a plasma emission produced in the region of the Ioplasma torus. Measurements from the Waves instrument onboard the Junospacecraft permitted to establish the distribution of nKOM occurrence andintensity as a function of frequency and latitude. We have developed a 3Dgeometrical model that can simulate at large scale the plasma emissionsoccurrence observed by a spacecraft based on an internal Jovian magnetic fieldmodel and a diffusive equilibrium model of the plasma density in Jupiter'sinner magnetosphere. With this model, we propose a new method to discriminatethe generation mechanism, wave mode, beaming and radio source location ofplasma emissions. Here, this method is applied to the study of the nKOMobserved from all latitudes by the Juno/Waves experiment to identify whichconditions reasonably reproduce the observed occurrence distribution versusfrequency and latitude. The results allow us to exclude the two main nKOMmodels published so far, and to show that the emission must be produced at thelocal plasma frequency and beamed along its local gradient in the direction ofdecreasing frequencies. We also propose that depending on its latitude, Junoobserves two distinct kinds of nKOM: the low frequency nKOM in ordinary mode athigh latitudes and high frequency nKOM on extraordinary mode at low latitudes.Both radio source locations are found to be distributed near the centrifugalequator from the outer edge to the inner edge of the Io plasma torus.

Generation mechanism and beaming of Jovian nKOM from 3D numerical modeling of Juno/Waves observations