Minor C9.3 solar flare erupts at 20:19 UTC on November 4, 2025

A minor C9.3 solar flare erupted at 20:19 UTC on November 4, 2025.

This flare is not explicitly listed in the edited solar events for November 4, 2025. Today’s flares include an X1.8 flare from region 4274 at 17:34 UTC, an M3.5 flare from region 4274 at 01:48 UTC, along with multiple C-class flares, including C3.4, C1.9, C2.1, C2.4, C2.6, C2.9, and C4.6 events.

In 24 hours to 12:30 UTC on November 4, solar activity reached moderate levels with three M-class flares observed, the largest being M3.5 at 01:48 UTC. Moderate growth occurred in the intermediate and trailing spots of region 4274. Regions 4273 and 4275 saw slight development while the rest remained stable. No Earth-directed coronal mass ejections were detected.

Flare probabilities are at 60% for M-class (R1-R2 – Minor to Moderate) and 10% for X-class (Strong).

Active sunspot regions presently observed on the Earth-facing solar disk include AR 4267 (N01W79 – Alpha), AR 4272 (N23E48 – Beta), AR 4273 (S12E11 – Beta-Gamma), AR 4274 (N24E63 – Beta-Gamma), and AR 4275 (N07E75 – Beta-Gamma).

Over the past 24 hours, greater than 2 MeV electron flux was at moderate to high levels, peaking at 4 940 pfu. Greater than 10 MeV proton flux was at background values. The electron flux is expected to remain at moderate to high levels from November 4 to 6, with a slight chance for an S1 – Minor solar radiation storm during this period due to ongoing flare activity.

During the previous 24 hours, solar wind parameters remained mildly enhanced with declining activity. Solar wind speed decreased from approximately 480 km/s to near 420 km/s, the total magnetic field ranged from 4-9 nT, and the Bz component fluctuated between +5 and -7 nT. The solar wind is expected to show waning high-speed stream effects in the days ahead. Enhanced conditions are predicted late November 6 into November 7 due to a coronal hole high-speed stream and CME arrival.

In the last day, the geomagnetic field was at quiet to active levels. The geomagnetic field is expected to relax to quiet to unsettled levels on November 4 and 5. Late in the day on November 6, geomagnetic conditions are forecast to strengthen due to CME and high-speed stream arrivals, with a G1 – Minor geomagnetic storm watch in effect for that period.