Hot Plasma Properties and Dynamics in the Magnetospheres of Jupiter and Saturn

We compare computations from measurements of hot ions in the nightside magnetospheres of Jupiter and Saturn using Voyager, Galileo, and Cassini instruments. The 2 magnetospheres have a remarkably similar configuration and convection pattern when scaled to their relative sizes. We find asymmetries in local time on the nightside that suggest magnetopause interaction and reconnective processes affect the global configuration and convection pattern. Both magnetospheres exhibit adiabatic transport and corotation that can be substantially disrupted or enhanced by dynamic events such as injections. We also report on new analysis of dayside hot plasma from the INCA detector on Cassini, and on the adaptation of our hot plasma convection model to data from the CHEMS instrument on the Cassini spacecraft.