A detailed map of the Jovian high-energy radiation belts

Abstract

High energy particle fluxes (>15MeV e- and 120MeV p+) throughout the Jovian magnetosphere have been continuously measured by the MAG investigation’s ASC instrument. Juno’s highly elliptical polar orbit has effectively traversed almost all of the Jovian magnetosphere with most regions sampled multiple times over time. Pronounced variations in the observed flux for comparable regions of the magnetosphere are observed in association with the positions of the Galilean moons and their associated dust and plasma tori, while global variations appear to be coupled to magnetic compression due to corona mass ejections. Oversampling of specific regions affords the opportunity to compile a quiet time map of the energetic trapped particle environment despite variations in solar activity and satellite-related effects. Subtracting this quiet time flux from that observed yields detailed information on the impact of solar activity, the Galilean moons, and the gossamer rings on the high-energy trapped particle environment of Jupiter. We present the observed quiet time map and show the impact on the trapped high-energy flux from the abovementioned local sources and sinks, and compare these results to those observed by Pioneer 10 and 11.