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Loading contentGeomagnetic storms drive currents in the ground that flow into long transmission lines — geomagnetically induced currents — which can saturate and damage transformers and, in severe cases, cause regional blackouts. The 1989 Québec blackout is the classic example.
Facts on this topic will be cited from these primary and reference sources.
Space-weather forecasts and alerts: aurora (OVATION), the Kp index, and the G1–G5 geomagnetic storm scale.