Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 45, Issue 3, Pages 1246-1252Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/2017GL076878
Keywords
pitch angle scattering; Juno; upgoing electron beams; whistler mode; Jupiter; polar cap
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Funding
- NASA [699041X]
- Southwest Research Institute
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The Juno spacecraft's Jupiter Energetic-particle Detector Instrument has observed field-aligned, unidirectional (upgoing) electron beams throughout most of Jupiter's entire polar cap region. The Waves instrument detected intense broadband whistler mode emissions occurring in the same region. In this paper, we investigate the pitch angle scattering of the upgoing electron beams due to interactions with the whistler mode waves. Profiles of intensity versus pitch angle for electron beams ranging from 2.53 to 7.22 Jovian radii show inconsistencies with the expected adiabatic invariant motion of the electrons. It is believed that the observed whistler mode waves perturb the electron motion and scatter them away from the magnetic field line. The diffusion equation has been solved by using diffusion coefficients which depend on the magnetic intensity of the whistler mode waves.
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