Minor C8.7 solar flare erupts at 00:08 UTC on November 4, 2025

A minor C8.7 solar flare erupted at 00:08 UTC on November 4, 2025.

Today’s flares include no reported solar flare events according to the latest available observational event listings provided for November 4, 2025. No X-class or M-class flares have been documented in the event reports for this day.

In 24 hours to 00:30 UTC on November 4, solar activity reached high levels, primarily due to an M5.0 flare observed at 10:11 UTC on November 3. Several additional M-class and C-class flares were produced during this period. The overall structure of active regions remains complex and dynamic, with multiple regions displaying magnetic complexity and evolution but not all currently producing significant flare activity.

Flare probabilities stand at 55% for R1 – Minor to R2 – Moderate events and 10% for X-class – Strong events, primarily due to ongoing activity in magnetically complex regions.

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, the greater than 2 MeV electron flux was mostly above 1 000 pfu, with a maximum observation of 2 660 pfu. The greater than 10 MeV proton flux remained at background levels. The electron flux is anticipated to stay at moderate to high levels as the coronal hole high speed stream influence wanes, while the proton flux is forecasted to remain at background levels unless significant flare or CME activity arises from active regions.

The solar wind over the past 24 hours reflected an embedded coronal mass ejection that departed the Sun on October 31 within a high speed stream. Interplanetary magnetic field strength ranged between 7–9 nT with a persistent negative Bz component; solar wind speed varied from 450–500 km/s. Solar wind conditions are expected to steadily decline to less enhanced conditions in the coming days. However, a new high speed stream and CME are expected to impact Earth around November 6–7, which is likely to produce a period of elevated solar wind parameters.

Geomagnetic field activity over the past 24 hours was mostly unsettled to active, under the influence of CME and high speed stream effects. Quiet to unsettled geomagnetic conditions are anticipated for November 4–5. An enhancement to G1 – Minor geomagnetic storm levels is expected late on November 6 due to the arrival of a new high speed stream and CME interaction.