Geosynchronous orbit (GEO) weathering induces differential charging of spacecraft surfaces due to simultaneous fluxes of electrons with a wide distribution of energies onto, into, and through spacecraft surface materials. Thus, satellite surfaces can charge thousands of volts with respect to each other whereas entire satellites can charge tens of thousands of volts negative of their surrounding space plasma. The ensuing electric fields can cause local discharges (arcs) from one part of the spacecraft to another, endangering the normal operation of the satellite. Arcing on solar panels can cause reduced optical transmission through solar cell coverglasses which will lead to reduced power production negatively affecting a long-term satellite missions. This work focuses on evaluation of simulated GEO space weather effect, comprised by < 90 keV high-energy electron irradiation, on optical and charge transport properties of two different types of commonly used space solar cells coverglasses, CMX and CMG.
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