This is a research grant awarded by the National Aeronautics and Space Administration (NASA) to The Aerospace Corporation, a non-profit organization that provides technical and scientific research and advisory services to NASA and other government agencies. The grant, valued at $287,222.44, is for a project to understand the variability of the radiation environment in the inner magnetosphere and assess its impact on spacecraft materials. The key objectives are to characterize how solar wind inputs affect the radiation environment, and quantitatively assess the influences of the radiation belts on spacecraft charging. This work supports NASA's civil, defense, and commercial space initiatives. The Aerospace Corporation holds other prime and subcontract awards from NASA, the National Oceanic and Atmospheric Administration, and the National Science Foundation for various space technology and science projects.