Statistical analysis of Juno observations of >~ 5 MeV electron beams at Jupiter

A meticulous multi-instrument analysis of Juno observations for the first ten science orbits (PJ1, PJ3-11) had demonstrated the capability of Juno/MWR instrument to detect the signature of (mainly downward) MeV electron beams (>~ 5 MeV). These radio signatures are typically observed when Juno is in the process of crossing intense bi-directional electron flux tubes (JEDI and JADE observations) connected to the main auroral emissions or poleward auroral spots. Juno/UVS maps of auroral regions at 158-162 nm (and color ratio maps) and > 10 MeV electron fluxes inferred from Juno/ASC and JEDI, along with JADE radiation background counts, support Juno/MWRs observations of highly energetic electrons (>> keV to 10s of MeV) precipitating into the upper atmosphere. The statistical distribution of downward MeV electron beams places these events at no particular SIII longitudes, although they have been observed in the AM sector (LT ~ 5-10.5) and linked to field lines mapping onto the equator at M-shells of ~30-70 so far. We propose to further analyze Juno observations of >~ 5 MeV electron beams, by including the latest science orbits (PJ12-PJ18). We will examine their statistical distribution in different coordinate systems (magnetic and with respect to sub-solar point), both when observed at high latitudes close to the planet and mapped onto the equator in the middle magnetosphere. Resonant electron scattering caused by diverse waves have been considered to predict pitch-angle scattering phenomenon for MeV electrons at Jupiter [e.g. Ciurera-Borcia et al., Physics of Plasma 8, 266 (2001), Physics of Plasma 6, 4597 (1999)]. We will present our progress in analyzing Juno particle, field, and radio data and understanding the origins of >~ 5 MeV electron beams at Jupiter.