Strongest Solar Flare of 2025 (X5.1) Triggers Radio Blackouts; NOAA Confirms G4 Geomagnetic Storm
Sunspot AR4274’s powerful eruption at 10:04 UTC on Nov. 11 caused R3 radio blackouts across parts of Africa and Europe. A fast coronal mass ejection then drove “Severe” G4 geomagnetic storm levels early Nov. 12, with additional disturbances possible through