“SOLAR ENERGETIC PARTICLES affect the space environment in multiple ways. In the outer magnetosphere (especially near the geostationary region), their presence is a hazard for the satellite systems and instrumentation. If they become trapped in the inner magnetosphere dipolar field, they populate the van Allen belts, residing in the magnetosphere for extended periods.”
https://link.springer.com/article/10.12942/lrsp-2007-1