Regulatory Authority
Appears in 1 story
Enforces grid protection standards for geomagnetic disturbances
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 May 22
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