Auroral Injections and the Magnetospheric Processes at Jupiter

Jupiter’s powerful auroral emissions include a substantial component from the region at lower latitudes than the main auroral oval, named outer auroral emission. Besides the persistent auroral footprint of Jupiter’s natural moon Io, auroral injection are often observed in the outer auroral region, manifesting the magnetospheric plasma injection from middle/outer magnetosphere to the inner magnetosphere. Magnetospheric plasma injections sometimes have auroral counterparts, while sometimes have not. It is yet to be understood what controls the auroral counterparts of magnetospheric plasma injections. In this presentation, we show a long-lasting auroral injection events captured by the Hubble Space Telescope, together with simultaneous particle measurements from the Juno spacecraft. Multiple auroral substructures were identified in the injection region, which are likely associated with the observed filament plasma injections. Highest ever global numerical simulation, for the first time reproduced the massive auroral injection event. The multiple datasets and mesoscale-resolving global simulation provides key insights to understand the plasma injection processes and associated auroral emissions.