A strong geomagnetic storm is forecast for November 12, 2025, following the expected arrival of two coronal mass ejections (CMEs) from Active Region 4274. The event is likely to reach G3 – Strong or higher levels, making aurora visible as far south as Pennsylvania, Iowa and Oregon.
Proton flux rose sharply following X1.2 solar flare at 07:19 UTC on November 10, 2025, reaching S1 – Minor Solar Radiation Storm levels at 11:20 UTC.
Active Region 4274 produced its second X-class solar flare since it emerged from the far side last week, this time peaking as X1.2 at 09:19 UTC on November 10, 2025. This is now the third X-class flare since the November 4 X1.8 and X1.1. A coronal mass ejection (CME) was associated with the latest event and is expected to have an Earth-directed component.
A major long-duration solar flare measuring X1.7 erupted from Active Region 4274 at 07:35 UTC on November 9, 2025, producing an assymetric halo CME with impact expected around 12:00 UTC on November 11. The event started at 07:01 and ended at 07:55 UTC.
Solar activity reached high levels on November 5, 2025, as Region 4274 (N24E40) produced two powerful M-class flares – an M7.4 at 11:19 UTC and an M8.6 at 22:07 UTC. The full-halo CME from the first event is expected to reach Earth late November 6 to early November 7, likely producing G3 – Strong geomagnetic storm conditions and visible auroras across Canada and the northern United States.
A G3 – Strong geomagnetic storm is forecast for November 6 and 7, 2025. The disturbance originates from X-class solar flares and associated coronal mass ejections (CMEs) recorded on November 4, combined with a coronal-hole high-speed stream. Aurora is expected to become visible across much of Canada and the northern United States, possibly reaching as far south as Pennsylvania, Iowa, and Oregon.
Two powerful X-class solar flares erupted on November 4, 2025 — an X1.8 from Region 4274 and an X1.1 from a region just beyond the east limb — launching CMEs largely off the solar limb. NOAA forecasts G1 – Minor to G2 – Moderate geomagnetic storming from late November 6 into 7 as Earth may experience a glancing shock from the flares combined with a coronal hole high-speed stream.
A major solar flare measuring X1.8 erupted from Active Region 4274 at 17:34 UTC on November 4, 2025. The event started at 17:15 and ended at 17:51 UTC. This is the first X-class flare since the impulsive X1.9 from Active Region 4114 at 23:50 UTC on June 19, 2025.
A long-duration solar flare measuring M5.0 erupted from an active region located at the NE limb of the Sun at 10:11 UTC on November 3, 2025. The event started at 09:38 and ended at 10:37 UTC.
A G2 – Moderate geomagnetic storm on October 18, 2025, produced an extremely bright red SAR arc visible from the United States to northern Europe. The event showed an unusually efficient release of energy from Earth’s ring current system, challenging current understanding of how the planet’s magnetic field interacts with the atmosphere.
