Geosynchronous ESD environment characterization via in situ measurements on host spacecraft

Controlling and mitigating spacecraft charging effects requires prudent design, test, and verification measures to related to material surface properties when exposed to a variety of operational and environmental conditions. In this paper we use two targeted sensors to characterize the surface charging environment and threat of surface / differential charging for June to October 2010. Surface potential measurements and ~4 keV to ~40 keV electron flux measurements are utilized to investigate the timescale of charging events, study complementary results amongst sensors on nearby spacecraft, and develop a process for near-real time charging threat assessment aboard host spacecraft. Findings are relevant for assessments of space system impacts resulting from surface discharges and ESD, simulations of surface charging, and laboratory testing of flight systems designs.