An X1.5 solar flare erupted from AR 4366 at 14:08 UTC on February 3, 2026, the fifth X-class event recorded since February 1. The flare caused an R3-level radio blackout over daylight regions of Earth, affecting HF communication across the Atlantic and parts of Europe and Africa.
A coronal mass ejection (CME) associated with an X8.1 solar flare from Region 4366 at 23:57 UTC on February 1 is forecast to glance Earth late on February 5, 2026. The impact is expected to produce G1 – Minor geomagnetic storm conditions and possible auroral activity poleward of 60 degrees Geomagnetic Latitude. This was the third-strongest solar flare of Solar Cycle 25.
A major X8.1 solar flare erupted from Active Region 4366 at 23:57 UTC on February 1, 2026, following rapid magnetic expansion and intense flaring throughout the day. The region also produced an X1.0 flare at 12:33 UTC on February 1 and an X2.8 event at 00:36 UTC and an X1.6 at 08:14 UTC on February 2, accompanied by more than 20 M-class flares since 02:00 UTC on February 1.
A major X1.0 solar flare erupted at 12:33 UTC on February 1, 2026, from Active Region 4366, following a sequence of strong M-class flares earlier in the day, including M6.6 and M6.7 flares within two hours. The event started at 11:52 and ended at 12:38 UTC. With the region now rotating toward the center of the solar disk and maintaining a complex beta-gamma-delta magnetic configuration, conditions are favorable for Earth-directed CMEs in the days ahead.
Severe geomagnetic storm on January 19, 2026, generated a rare auroral glow inside the South Atlantic Anomaly, a region where Earth’s magnetic field is significantly weaker. Photographers in Brazil captured a diffuse purple band over Cambará do Sul during peak geomagnetic activity, documenting the latest in rare instances of possible auroral or SAR arc activity within the anomaly.
The impact of a full halo coronal mass ejection (CME) at Earth on January 19, 2026, drove geomagnetic activity to G4 – Severe levels, producing widespread aurora across Europe, Asia, and the United States.
A G4 – Severe solar radiation storm is in progress after ≥10 MeV proton flux exceeded 10 000 pfu at 18:10 UTC on January 19, 2026, following the X1.9 solar flare on January 18. As the associated full-halo coronal mass ejection approaches Earth, forecasters warn that a G4 – Severe geomagnetic storm is likely early on January 20.
A G4 – Severe or greater geomagnetic storm is forecast for early January 20, 2026, as a full-halo coronal mass ejection from the January 18 X1.9 solar flare approaches Earth. If G4 conditions materialize, auroral activity is expected to expand significantly equatorward, with visibility possible as far south as Alabama and northern California.
A strong solar radiation storm (S3) is in progress after ≥10 MeV proton flux exceeded 1 000 pfu at 10:20 UTC on January 19, 2026. The event follows an X1.9 solar flare and full-halo coronal mass ejection that erupted on January 18. S3 – Strong solar radiation storms are relatively rare, occurring just a few times in one 11-year solar cycle.
Following an X1.9 flare and associated full-halo coronal mass ejection (CME) late on January 18, 2026, the ≥10 MeV proton flux rose above 100 pfu early on January 19. The event reached S2 – Moderate solar radiation storm levels, prompting extended warnings for continued elevated radiation conditions through the rest of the day.
