Solar Orbiter charging effects on electron measurements via SPIS simulation.

The ESA mission Solar Orbiter is providing, besides other observations, in-situ measurements of the solar wind plasma. The boom mounted electron analyser (SWA-EAS) acquires ambient as well as spacecraft produced (photo-, secondary-) electrons. To correctly interpret and derive the solar wind electron population, we need to understand the artificial populations, their production rate, energy distribution, and directional dependence on the ambient conditions for the given spacecraft geometry. In order to investigate the various electron populations in the spacecraft vicinity, we incorporate a numerical model of the Solar Orbiter spacecraft into the Spacecraft Plasma Interaction Software (SPIS). Hereby, we present preliminary results and challenges of such simulations and their interpretations.