Minor C8.3 solar flare erupts at 14:30 UTC on November 5, 2025

A minor C8.3 solar flare erupted at 14:30 UTC on November 5, 2025.

Today’s flares include a strong M7.4 at 11:19 UTC from region 4274, with other notable events including C9.9 at 05:05 UTC, C8.0 at 03:01 UTC, C6.2 at 01:55 UTC, and C4.9 at 07:49 UTC, all also associated with region 4274. No X-class flares are listed for November 5, 2025; the strongest observed event is the M7.4 flare.

In 24 hours to 12:30 UTC on November 5, solar activity reached high levels due to a pair of X-class flares. An X1.8 flare occurred at 17:34 UTC on November 4, and an X1.1 flare at 22:01 UTC on November 4. Additional activity included an M1.7 flare from region 4272 at 22:44 UTC on November 4, and an M7.4 flare from region 4274 at 11:19 UTC on November 5. Further analysis of the potential ejecta associated with the M7.4 flare is pending.

Solar activity forecast: There is a 70% chance for R1 – Minor to R2 – Moderate radio blackouts and a 25% chance for R3 – Strong events due to the continued activity and complex structure of region 4274.

Active sunspot regions presently observed on the Earth-facing solar disk include AR 4267 (N01W91 – Alpha), AR 4272 (N22E36 – Beta), AR 4273 (S12W01 – Beta-Gamma), AR 4274 (N24E53 – Beta-Gamma-Delta), and AR 4275 (N07E61 – Beta-Gamma).

Over the past 24 hours, the greater than 2 MeV electron flux remained above 1 000 pfu during peak diurnal periods but is trending downward as Earth moves out of the geoeffective position relative to a coronal hole high speed stream. The greater than 10 MeV proton flux became enhanced, but remained well below the S1 – Minor threshold following recent X-class flare activity. Electron flux is expected to decline through November 6 as the coronal hole high speed stream influence wanes, with a potential rise again on November 7. There is a chance for the proton flux to reach the S1 – Minor threshold between November 5 and 7 due to the ongoing flare activity in region 4274.

Solar wind parameters remained near nominal levels over the past 24 hours with wind speed between 341 and 447 km/s, total field from 3 to 7 nT, and a period of southward Bz reaching -6 nT from 20:44 UTC on November 4. Solar wind parameters are likely to remain nominal through November 6, with enhancement expected upon arrival of the next coronal hole high speed stream on November 6 to November 7. Three CMEs from region 4274, observed on November 3 and November 4, are projected to pass behind Earth with possible interaction with the high speed stream enhancing solar wind conditions during this period.

The geomagnetic field was at quiet to active levels due to a prolonged period of southward Bz. The field is expected to remain at quiet to active levels on November 5. From late November 6 into November 7, the arrival of the high speed stream combined with potential CME arrivals is likely to produce G1 – Minor geomagnetic storming levels with a slight chance for G2 – Moderate levels. Watches are in effect for these intervals.