The Jovian Auroral Distributions Experiment (JADE) on Juno provides the
critical in situ measurements of electrons and ions needed to understand the plasma
energy particles and processes that fill the Jovian magnetosphere and ultimately produce
its strong aurora. JADE is an instrument suite that includes three essentially identical
electron sensors (JADE-Es), a single ion sensor (JADE-I), and a highly capable
Electronics Box (EBox) that resides in the Juno Radiation Vault and provides all
necessary control, low and high voltages, and computing support for the four sensors.
The three JADE-Es are arrayed 120∘ apart around the Juno spacecraft to measure complete
electron distributions from ˜0.1 to 100 keV and provide detailed electron pitch-angle
distributions at a 1 s cadence, independent of spacecraft spin phase. JADE-I measures
ions from ˜5 eV to ˜50 keV over an instantaneous field of view of 270∘×90∘ in 4 s and
makes observations over all directions in space each 30 s rotation of the Juno spacecraft. JADE-I also provides ion composition measurements from 1 to
50 amu with m/Δ m˜2.5, which is sufficient to separate the heavy and light ions, as well as
O+ vs S+, in the Jovian magnetosphere.