I. Introduction
Dielectric materials exposed to energetic electron fluxes similar to those in space plasma environments can emit light in various forms [1]. It is important to understand these charge and discharge phenomena that occur under space-like conditions, because spacecraft charging is the leading environmental cause of spacecraft anomalies [2], [3]. Two forms of electron-induced light emission have been commonly encountered, both of which emit light from large surface areas that have been charged by the incident electron flux [4], [5]. Continuous emission observed whenever a material is exposed to electron fluxes is termed “glow,” or more properly, cathodoluminescence (CL) [4], [6]–[8]. Intermediate-duration light emissions events, which start with a large rapid spike in intensity similar to arcs and are followed by an exponential decay (~10–100 s decay constant) back to the continuous equilibrium CL intensity, have also been observed for several polymeric and composite materials [1], [5].