Moderate M3.5 solar flare erupts at 01:48 UTC on November 4, 2025

A moderate M3.5 solar flare erupted at 01:48 UTC on November 4, 2025.

Today’s flares include a C6.5 flare from region 4274, which started at 01:24 UTC, peaked at 01:29 UTC, and ended at 01:31 UTC. No X- or other M-class flares are reported for this date and time in the event data provided.

In 24 hours to 00:30 UTC on November 4, solar activity reached high levels due to an M5.0 flare from region 4274. The same region produced three additional M-class flares within the last 24 hours. Region 4272 produced a single M-class flare and several C-class flares, while region 4273 showed rapid magnetic development but minimal flare activity. Two CMEs occurred but are expected to largely miss Earth, interacting instead with an approaching high-speed coronal hole stream due to arrive November 6–7.

Flare probabilities remain elevated with a 55% chance for an R1–R2 (minor to moderate) event and a 10% chance for an X-class (strong) event.

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

Over the past 24 hours, greater than 2 MeV electron flux remained mostly above the 1 000 pfu threshold due to ongoing coronal hole high speed stream influence. The greater than 10 MeV proton flux stayed at background levels. The electron flux is expected to remain at moderate to high as HSS influence wanes, while proton flux should remain at background levels barring significant future flare or CME activity from region 4274.

Solar wind parameters reflected an embedded CME within a coronal hole high speed stream, with the total interplanetary magnetic field between 7–9 nT and the north-south component at -5 to -7 nT. Speeds ranged from 450–500 km/s and the phi angle remained positive. Waning CH HSS conditions are forecast for the coming days. A new high speed stream and CME are expected to impact Earth between late November 6 and November 7, resulting in enhanced solar wind parameters.

The geomagnetic field was unsettled to active due to CME and HSS effects. Geomagnetic conditions are forecast to become quiet to unsettled on November 4–5, then become enhanced from late November 6 due to CME and HSS arrival. A G1 – Minor geomagnetic storm watch is in effect for November 6.