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.
Bibliographical noteFunding Information:
The research at the University of Iowa was supported by NASA through contract 699041X with the Southwest Research Institute. Juno data are regularly made publicly available via the Planetary Data System (PDS) according to the Juno Project archiving schedule. More recent data that have not yet been released via the PDS may be requested from the authors.
©2018. The Authors.
- pitch angle scattering
- polar cap
- upgoing electron beams
- whistler mode