A heavy ion and proton radiation belt inside of Jupiter's rings

P. Kollmann; C. Paranicas; G. Clark; B. H. Mauk; D. K. Haggerty; A. M. Rymer; D. Santos-Costa; J. E. P. Connerney; F. Allegrini; P. Valek; W. S. Kurth; G. R. Gladstone; S. Levin; S. Bolton

doi:10.1002/2017GL073730

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A heavy ion and proton radiation belt inside of Jupiter's rings

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A heavy ion and proton radiation belt inside of Jupiter's rings

P. Kollmann, C. Paranicas, G. Clark, B. H. Mauk, D. K. Haggerty, A. M. Rymer, D. Santos-Costa, J. E. P. Connerney, F. Allegrini, P. Valek, …

Geophysical research letters, Vol.44(11), pp.5259-5268

06/16/2017

DOI: 10.1002/2017GL073730

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Abstract

Energetic charged particle measurements by the Jupiter Energetic Particle Detector Instrument (JEDI) on board Juno have revealed a radiation belt of hundreds of keV ions up to the atomic mass of sulfur, located between Jupiter's rings and atmosphere. Proton energy spectra display an unusual intensity increase above 300 keV. We suggest that this is because charge exchange in Jupiter's neutral environment does not efficiently remove ions at such high energies. Since this innermost belt includes heavy ions, it cannot be exclusively supplied by cosmic ray albedo neutron decay, which is an important source at Earth and Saturn but only supplies protons and electrons. We find indications that the stripping of energetic neutral atoms in Jupiter's high atmosphere might be the ion source. Since the stripped off electrons are of low energy, this hypothesis is consistent with observations of the ratio of energetic electrons to ions being much less than 1. Plain Language Summary Planets with their own a magnetic field, as Earth and Jupiter, are surrounded by “belts” of radiation. In case of Jupiter, most of this radiation extends to relatively large distances to Jupiter (several times the size of the planet) but is so strong that it is difficult to engineer satellites that can fly through them safely. Juno is the first spacecraft that repeatedly passes close to Jupiter and its Jupiter Energetic Particle Detector Instrument (JEDI) was now able to measure and quantify a small, separate radiation belt close to Jupiter. The measured population was unknown before and is located between Jupiter's atmosphere and its tenuous rings, inward to the main radiation belt. Key Points There is a radiation belt within Jupiter's rings This innermost belt consists of ion masses up to sulfur but very few electrons Energetic neutral atoms may be the source of this innermost belt

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energetic neutral atoms ENA

energetic particles

Juno

Jupiter

radiation belt

Details

Title: Subtitle: A heavy ion and proton radiation belt inside of Jupiter's rings
Creators: P. Kollmann - Johns Hopkins University Applied Physics Laboratory
C. Paranicas - Johns Hopkins University Applied Physics Laboratory
G. Clark - Johns Hopkins University Applied Physics Laboratory
B. H. Mauk - Johns Hopkins University Applied Physics Laboratory
D. K. Haggerty - Johns Hopkins University Applied Physics Laboratory
A. M. Rymer - Johns Hopkins University Applied Physics Laboratory
D. Santos-Costa - Southwest Research Institute
J. E. P. Connerney - Goddard Space Flight Center
F. Allegrini - Southwest Research Institute
P. Valek - Southwest Research Institute
W. S. Kurth - University of Iowa
G. R. Gladstone - Southwest Research Institute
S. Levin - Jet Propulsion Laboratory
S. Bolton - Southwest Research Institute
Resource Type: Journal article
Publication Details: Geophysical research letters, Vol.44(11), pp.5259-5268
DOI: 10.1002/2017GL073730
ISSN: 0094-8276
eISSN: 1944-8007
Number of pages: 10
Grant note: NASA New Frontiers Program for Juno
Language: English
Date published: 06/16/2017
Academic Unit: Physics and Astronomy
Record Identifier: 9984455279502771

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