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Accurate determination of Cassini's spacecraft potential in Titan'sionosphere is important for interpreting measurements by its low energy plasmainstruments. Estimates of the floating potential varied significantly, however,between the various different plasma instruments. In this study we utilize 3-Dparticle-in-cell simulations to understand the key features of Cassini's plasmainteraction in Titan's ionosphere. The spacecraft is observed to charge tonegative potentials for all scenarios considered, and close agreement is foundbetween the current onto the simulated Langmuir Probe and that observed inTitan's ionosphere. These simulations are therefore shown to provide a viabletechnique for modeling spacecraft interacting with Titan's dusty ionosphere.

Cassini's floating potential in Titan's ionosphere: 3-D Particle-In-Cell Simulations