High Voltage Frame and Differential Charging Observed on a Geosynchronous Spacecraft

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

We have studied the frequency and levels of frame and differential charging on a geosynchronous satellite since August of 1995. High voltage differential charging was measured with Surface Potential Monitors (SPM) for two typical spacecraft surfaces (Kapton and Astroquartz). Frame charging was determined using an ion electrostatic analyzer. In addition, the integrated electron population between 20 and 50 keV was also measured. The statistical study includes frame and differential charging over a three-year period. We also address the ability to reduce the charging levels using an autonomous Charge Control System (CCS). The CCS releases a Xenon plasma to help provide current balance when high fluxes of electrons impinge on the spacecraft. A case study of a charging event will focus on identifying the population responsible for charging, current balance issues and differences in charging levels as observed by the SPM and the ion analyzer.

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