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Jupiter’s Northern Aurora: High-energy Particle Precipitation and Juno MWR Observations

Presentation #309.03 in the session Giant Planet Magnetospheres, Ionospheres and Aurorae (Oral Presentation)

Published onOct 23, 2023
Jupiter’s Northern Aurora: High-energy Particle Precipitation and Juno MWR Observations

Jupiter’s auroral ionosphere is characterized by high electron density due to energetic particle precipitation near the polar regions resulting in a plasma environment that exhibits reflection and absorption at microwave frequencies. Juno Microwave Radiometer (MWR) observations have detected cold brightness temperatures over the auroral oval in Jupiter’s northern hemisphere. These features are found to be prominent at 600 MHz to 5 GHz frequency channels, showing a temporal variation in brightness temperature over a time span less than a minute encompassing length scale of MWR polar footprint e.g. 0.1 RJ. We present an analysis of Juno MWR observations of the northern aurora, and simulate the electron densities corresponding up to 10 MeV energetic particle precipitation events inferred from the JEDI and UVS instruments. The plasma environment of Jupiter’s northern aurora is investigated using microwave opacity models to characterize the nature of reflection and absorption required to explain the MWR observations.

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