Juno Data Constrains Jupiter's Radio Emissions

Analysis of data from the Waves instrument onboard the Juno spacecraft, combined with 3D geometrical simulations, provides new constraints on the generation of Jupiter's narrowband radio components. The study focuses on narrowband kilometric radiation (nKOM) and narrowband low-frequency radiation (nLF), which are believed to originate within the plasma near the Io plasma torus (IPT). By using electron density and magnetic field data from Juno's JADE and FGM instruments, researchers classified the observed emissions according to their propagation modes. The 3D numerical modeling method developed in Boudouma et al. (2024) was applied to the escaping and undetermined nKOM and nLF observations, deriving macroscopic constraints on the generation mechanisms, wave modes, characteristic frequencies, beaming, and source locations. The results suggest that high-latitude nKOM is consistent with O-mode, while low-latitude nKOM is X-mode. Both nKOM and nLF appear to be generated near the fundamental plasma frequency, with nLF also showing compatibility with emission near the first harmonic. This suggests the possible coexistence of both linear and nonlinear generation mechanisms. These findings contribute to a better understanding of the complex plasma environment around Jupiter and the processes that generate its radio emissions.

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