Jupiter's Magnetosphere
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A selective review of studies of Jupiter's magnetosphere is presented which emphasizes theoretical questions concerning the hydromagnetic structure of the middle and outer magnetosphere. A brief overview of the Pioneer magnetospheric experiments is given, the Pioneer observations of the middle and outer magnetosphere are examined, and the characteristic signature of the middle magnetosphere is discussed. Evidence that Jupiter is a source of cosmic-ray electrons is evaluated, and three types of theoretical model of the Jovian magnetosphere are considered: earthlike convection models, quasi-steady disk models, and radial outflow models. The extent to which Jupiter and Io can supply the outer magnetosphere with plasma is also investigated along with corotation of the magnetosphere, the extent of the plasmapause, and limitations of the various models. Future theoretical and experimental studies are suggested, and some general principles for unified models of Jupiter's magnetosphere are outlined.