Rainbow Auroras: G4 Storm Paints Skies Across North America and Europe

2025-11-13T14:00:03.000Z A severe (G4) geomagnetic storm lit up skies across the Northern Hemisphere overnight (Nov. 11-12), with vivid northern lights visible across Canada, the U.S, and as far south as Mexico. The incredible display followed the arrival of multiple coronal mass ejections (CMEs) — eruptions of magnetic field and plasma from the sun — launched by sunspot AR4274, one of the most energetic sunspot groups of the current solar cycle.