The Voyager 1 ion data that were obtained inside the orbit of Io allow accurate determination of convective velocity, temperature, and density of the major ionic species (S+, O+, S2+, and O2+ ions). The irregular radial profiles of ion temperature and flux tube content are not consistent with simple models of radial transport of plasma from a source near Io. The evidence of a source of ions well inside Io's orbit is provided by the detection of molecular (SO2+) ions at 5.3 R J, the prevalence of non-Maxwellian tails to the ion distribution functions, the persistent presence of oxygen ions throughout the inner torus, and a 1--3% lag behind corotation outside 5.4 RJ.