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Plasma environment at the dawn flank of Jupiter's magnetosphere: Juno arrives at Jupiter
Ist Teil von
Geophysical research letters, 2017-05, Vol.44 (10), p.4432-4438
Ort / Verlag
Washington: Blackwell Publishing Ltd
Erscheinungsjahr
2017
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
This study examines the first observations from the Jovian Auroral Distributions Experiment (JADE) as the Juno spacecraft arrived at Jupiter. JADE observations show that Juno crossed the bow shock at 08:16 UT on 2016 day of year (DOY) 176 and magnetopause at 21:20 on DOY 177, with additional magnetopause encounters until 23:39 on DOY 181. JADE made the first detailed observations of the plasma environment just inside the dawn flank of the magnetopause. We find subcorotational ions and variable electron beaming, with multiple flux tubes of varying plasma properties. Ion composition shows a dearth of heavy ions; protons dominate the plasma, with only intermittent, low fluxes of O+/S++, along with traces of O++ and S+++. We also find very little
H3+ or He+, which are expected for an ionospheric plasma source. A few heavy ion bursts occur when the radial field nears reversal, but many other such reversals are not accompanied by heavy ions.
Key Points
First detailed plasma observations of the solar wind, bow shock, magnetopause, and outer dawn flank magnetosphere as Juno arrived at Jupiter
Outer dawn magnetosphere filled with flux tubes of varying plasma properties, counterstreaming electron beams, and sunward moving plasma
Lack of heavy compared to light ions indicating difference from plasma disk and centrifugal separation along Jovian magnetic flux tubes