Observations of MeV electrons in Jupiter's innermost radiation belts and polar regions by the Juno radiation monitoring investigation: Perijoves 1 and 3

Heidi N. Becker, Daniel Santos-Costa, John Leif Jørgensen, Troelz Denver, Alberto Adriani, Alessandro Mura, John E. P. Connerney, Scott J. Bolton, Steven M. Levin, Richard M. Thorne, James W. Alexander, Virgil Adumitroaie, Emily A. Manor-Chapman, Ingrid J. Daubar, Clifford Lee, Mathias Benn, Julia Sushkova, Andrea Cicchetti, Raffaella Noschese

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Abstract

Juno's “Perijove 1” (27 August 2016) and “Perijove 3” (11 December 2016) flybys through the innermost region of Jupiter's magnetosphere (radial distances <2 Jovian radii, 1.06 RJ at closest approach) provided the first in situ look at this region's radiation environment. Juno's Radiation Monitoring Investigation collected particle counts and noise signatures from penetrating high-energy particle impacts in images acquired by the Stellar Reference Unit and Advanced Stellar Compass star trackers, and the Jupiter Infrared Auroral Mapper infrared imager. This coordinated observation campaign sampled radiation at the inner edges of the high-latitude lobes of the synchrotron emission region and more distant environments. Inferred omnidirectional >5 MeV and >10 MeV electron fluxes derived from these measurements provide valuable constraints for models of relativistic electron environments in the inner radiation belts. Several intense bursts of high-energy particle counts were also observed by the Advanced Stellar Compass in polar regions outside the radiation belts.
Original languageEnglish
JournalGeophysical Research Letters
Volume44
Issue number10
Pages (from-to)4481–4488
ISSN0094-8276
DOIs
Publication statusPublished - 2017

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