  The flow of material from Io's volcanoes into the Io plasma torus, out into
the magnetosphere, and along field lines into Jupiter's upper atmosphere is not
adequately understood. The lack of observations of spatial and temporal
variations in the Io plasma torus impedes attempts to understand the system as
a whole. Here we propose that radio occultations of the Io plasma torus by the
Juno spacecraft can measure plasma densities in the Io plasma torus. We find
that the line-of-sight column density of plasma in each of the three regions of
the Io plasma torus (cold torus, ribbon, and warm torus) can be measured with
uncertainties of 10%. We also find that scale heights describing the spatial
variation in plasma density in each of these three regions can be measured with
similar uncertainties. Such observations will be sufficiently accurate to
support system-scale studies of the flow of plasma through the magnetosphere of
Jupiter.
