Energetic particle fluxes and spectra in the Jovian magnetosphere

The University of Iowa Pioneer 10 instrument is described and summaries of detector calibrations, data analysis techniques, and pertinent theories of the Jovian magnetosphere are presented. The in situ observations made with the University of Iowa energetic particle detectors in the Jovian magnetosphere reveal a relatively thin, outer magnetospheric region (called the magnetodisc) extending to a radial distance of over 100 R/sub J/ (Jovian radii) and a central magnetosphere of stably trapped particles inside of 15-20 R/sub J/. Particle species identification analysis demonstrates that observed counting rates are due primarily to electrons, E/sub e/ greater than 0.06 million electron volts (MeV)