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.
A long-duration X1.9 solar flare erupted from Active Region 4341 at 18:09 UTC on January 18, 2026. The event began at 17:27 and ended at 18:51 UTC. Coronagraph imagery indicates that a full halo coronal mass ejection (CME) was produced during the eruption. Given the location of the source region on the solar disk, the CME is considered likely to be at least partially Earth-directed, pending further analysis of its speed and magnetic structure.
A long-duration M3.3 flare erupted from just beyond the east-southeast limb at 11:00 UTC on January 11, 2026, as CME and coronal hole influences continued to disturb the solar wind environment. The geomagnetic field reached G1 – Minor to G2 – Moderate storm levels on January 10–11 under combined CME and coronal hole high-speed stream effects. Elevated solar wind parameters and unsettled-to-active geomagnetic conditions are expected to persist through January 14.
Multiple coronal mass ejections (CMEs) launched from Active Region 4334 on January 8, 2026, are expected to deliver a glancing blow to Earth between late January 10 and early January 11, according to the U.S. Space Weather Prediction Center (SWPC). The interaction of several CMEs and a coronal hole high-speed stream is forecast to cause isolated G1 – Minor geomagnetic storm conditions. Aurora may become visible across high latitudes, including the northern tier of the United States, such as northern Michigan and Maine.
A long-duration solar flare measuring M7.1 at its peak erupted from Active Region 4324 at 13:51 UTC on December 31, 2025. The event started at 13:12 and ended at 14:11 UTC.
A coronal mass ejection (CME) associated with an M4.2 solar flare from Region 4317 is expected to produce a G1 – Minor geomagnetic storm as it grazes Earth late on December 31 into early January 1, 2026.
Auroras are expected across much of the northern United States, southern Canada, and northern Europe on December 9, 2025, following a forecasted geomagnetic disturbance caused by a coronal mass ejection (CME) produced during the December 6 M8.1 solar flare.
A major solar flare measuring X1.1 erupted from Active Region 4298 at 05:01 UTC on December 8, 2025. The event started at 04:49 and ended at 05:04 UTC.
