The Space Weather Threat Environment

Solar Cycle 25 peaked roughly 50% above the 2019 consensus prediction. It produced the most severe geomagnetic storm in over three decades, the May 2024 'Mother's Day Storm', the first G5 event since March 1989. For satellite operators, governments, and critical-infrastructure owners, this paper covers what that actually means in practice: how Solar Cycle 25 has behaved and where solar forecasting still falls short, the mechanics behind geomagnetic storms and the NOAA scales used to classify them, and the historical record of major storms, including a documented case where a storm alone caused the operational loss of an active satellite deployment.