Minor C8.0 solar flare erupts at 03:01 UTC on November 5, 2025

A minor C8.0 solar flare erupted at 03:01 UTC on November 5, 2025.

Today’s flares include a C4.3 flare at 00:58 UTC and a C6.2 flare from region 4274 at 01:55 UTC.

In 24 hours to 00:30 UTC on November 5, solar activity reached very high levels, highlighted by an X1.8 flare at 17:34 UTC on November 4. An additional X1.1 flare was observed peaking at 22:01 UTC on November 4. Most flare activity has originated from region 4274.

Solar activity forecast: There is a 65% chance for R1 – Minor to R2 – Moderate radio blackouts and a 15% chance for R3 – Strong events due to continued activity in 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 diurnal maxima but is trending downward as Earth exits the geoeffective position of a coronal hole high-speed stream. The greater than 10 MeV proton flux remained at background levels. Electron levels are expected to continue decreasing through November 6 as high-speed stream influences wane, with another rise anticipated on November 7. Protons may rise slightly in the next 24 hours due to the recent X-class flare but are likely to stay below threshold.

Solar wind conditions over the past 24 hours reflected waning high-speed stream influences, with the interplanetary magnetic field ranging from 6 to 8 nT and the north-south component between -7 and +6 nT. Solar wind speeds decreased from 450 km/s towards 400 km/s and the phi angle remained positive. Solar wind parameters are likely to return to nominal values from November 5 to 6. Enhanced parameters are expected with the arrival of the next high-speed stream from November 6 to 7, influenced by three CMEs that are mostly projected to pass behind Earth, possibly interacting with the high-speed stream.

The geomagnetic field has been quiet to unsettled over the past 24 hours as high-speed stream effects diminished. Conditions are forecast to remain steady into November 6. Late November 6 into November 7, the combination of the coronal hole stream and trailing edges of the recent CMEs is likely to produce G1 – Minor geomagnetic storm levels, with a slight chance for G2 – Moderate levels.