Simultaneous UV Images and Particle Measurements of an Auroral Dawn Storm at Jupiter | CU Experts

We present Juno observations between 03:00 to 06:00 UT on day-of-year; 86, 2017 that link electrons in Jupiter’s polar magnetosphere to images; of transient, enhanced UV emissions in Jupiter’s dawn auroral region; known as a dawn storm. Juno ranged between 42 deg N - 51 deg N in; magnetic latitude and 7.8 - 5.8 jovian radii during this period. The UV; enhancements consist of two separate, elongated structures which extend; into the nightside, rotate with the planet, move to lower latitudes over; time, and have high color ratios. The electrons mapping to these; emissions exhibit sudden intensity depletions below ~10; keV coincident with intensity enhancements up to energies of; ~1000 keV, consistent with the high color ratio; observations. Electron pitch angle distributions are magnetic field; aligned and bidirectional. These high latitude observations are a result; of magnetospheric processes, likely plasma injections, that trigger the; generation of 100s of keV electrons to produce these dawn emissions.

Ebert RW; Greathouse TK; Clark G; Allegrini F; Bagenal F; Bolton SJ; Bonfond B; Connerney JEP; Gladstone R; Hue V

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