Federal Agency
Appears in 2 stories
Issued G4 storm warnings and coordinated response
On January 18, 2026, the Sun fired the most intense radiation storm in over 20 years directly at Earth. An X1.9-class flare launched a coronal mass ejection traveling at 1,700 kilometers per second—plasma moving fast enough to cross the Sun-Earth distance in just 25 hours.
Updated 2 days ago
Actively monitoring and forecasting AR4366 outbreak; issuing daily activity summaries and CME arrival predictions
Sunspot region AR4366 rotated into view February 1, two weeks after the January 19 X1.9 flare and G4.7 geomagnetic storm. At 23:44 UTC, AR4366 unleashed an X8.1 flare—the 3rd-largest of Cycle 25—triggering an R3 strong radio blackout across Earth's sunlit hemisphere, then fired four more X-class flares (X2.9, X2.8, X1.5, X1.7) within hours. By February 5, it had produced 10 X-class flares in five days and over 100 M-class flares, growing to nearly 10 times Earth's width with a magnetically unstable delta-class configuration.
Updated 7 days ago
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