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Energetic Neutral Atoms From Jupiter's Polar Regions
Author(s) -
Mauk B. H.,
Allegrini F.,
Bagenal F.,
Bolton S. J.,
Clark G.,
Connerney J. E. P.,
Gladstone G. R.,
Haggerty D. K.,
Kollmann P.,
Mitchell D. G.,
Paranicas C. P.,
Roelof E. C.,
Rymer A. M.
Publication year - 2020
Publication title -
journal of geophysical research: space physics
Language(s) - English
Resource type - Journals
eISSN - 2169-9402
pISSN - 2169-9380
DOI - 10.1029/2020ja028697
Subject(s) - jupiter (rocket family) , energetic neutral atom , magnetosphere , physics , saturn , astronomy , astrobiology , icy moon , magnetosphere of saturn , jovian , polar , planet , spacecraft , ion , magnetopause , plasma , quantum mechanics
Abstract Energetic Neutral Atom (ENA) cameras on orbiting spacecraft at Earth and Saturn helped greatly to diagnose these complex magnetospheres. Within this decade, the European Space Agency's Jupiter Icy Moons Explorer will make ENA imaging a major thrust in understanding Jupiter's complex magnetosphere. The present polar‐orbiting Juno mission at Jupiter carries no ENA camera. But, the Jupiter Energetic‐particle Detector Instrument is sensitive to >50 keV ENAs, provided there are no local charged particles to mask their presence. Juno offers great service to interpreting past serendipitous and future dedicated ENA imaging with its orbit providing unique viewing perspectives. Here we report Juno observations of ENAs from Jupiter's polar regions. These ENAs likely arise from energetic ions that nearly precipitate in the main auroral regions and mirror magnetically within, and charge exchange with, Jupiter's upper atmosphere. Jupiter proves itself different from Saturn, as ENAs generated from precipitating ions were not identified there.