Synchrotron emission model at Jupiter, updated from Juno's MWR observations

Juno's remote-sensing experiment, the Microwave Radiometer (MWR) collected a wealth of data representing Jovian thermal and non-thermal emissions from the atmosphere and magnetosphere. Other scientific instruments on the Juno spacecraft record in situ charged particles and magnetic field information. The contributions from three emission sources: the cosmic microwave background (CMB), the planet and synchrotron radiation belts need to be properly separated in order to obtain atmospheric composition retrieval values from Jupiter's observed low-frequency radiative signature via the microwave radiometer experiment.

Based on the in-situ data, the correct numerical treatment of the synchrotron radiation belts relies on the refinement of a higher-fidelity model, the multi-parameter, multi-zonal model of Levin et al. (2001). The underlying empirical electron-energy distribution has been adjusted using a Bayesian approach, using as prior the parameter values tuned from pre-Juno emission recordings taken via the Very Large Array (VLA) observatory.