JOVIAN ENERGETIC-PARTICLE MEASUREMENTS AND X-RAY IMAGES. M. Schulz, S. A. Fuselier,

Concept: Our group contemplates combining the simultaneous measurement of energetic particle fluxes (electrons up to 30 MeV, protons and other identifiable ions up to 200 MeV) with global imaging of X-rays (260 keV) from Jupiter and its icy moons. Our prototype for the X-ray imager is PIXIE, on NASA’s Earthorbiting Polar satellite. Scientific Rationale: Bombardment of Jupiter’s atmosphere by energetic electrons is likely to produce X-ray signatures complementary to already observed optical auroras on magnetic shells corresponding to Jupiter’s Galilean satellites. X-ray spectra reveal characteristics of the precipitating electron distribution, hence (for example) the amount by which electrons are energized by any parallel potential drops associated with the corresponding electrical circuits. X-rays produced by electron bombardment of the Galilean satellites themselves can be imaged with the same instrument. Such remote measurements with an onboard Xray imager thus complement in situ measurements of energetic charged-particle fluxes over a broad range of energies.