Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 44, Issue 10, Pages 4447-4454Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/2017GL073073
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- NASA [699041X]
- Southwest Research Institute
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The Juno Waves instrument detected a new broadband plasma wave emission (similar to 50 Hz to 40 kHz) on 27 August 2016 as the spacecraft passed over the low-altitude polar regions of Jupiter. We investigated the characteristics of this emission and found similarities to whistler mode auroral hiss observed at Earth, including a funnel-shaped frequency-time feature. The electron cyclotron frequency is much higher than both the emission frequency and local plasma frequency, which is assumed to be similar to 20-40 kHz. The E/cB ratio was about three near the start of the event and then decreased to one for the rest of the period. A correlation of the electric field spectral density with the flux of an upgoing 20 to 800 keV electron beam was found, with a correlation coefficient of 0.59. We conclude that the emission is propagating in the whistler mode and is driven by the energetic upgoing electron beam.
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