The event was associated with a Type IV Radio Emission, suggesting a strong coronal mass ejection (CME) was produced.
Additionally, a 10 cm Radio Burst lasting 3 minutes and with peak flux of 160 sfu was associated with the flare event. This emission indicates that the electromagnetic burst associated with a solar flare at the 10 cm wavelength was double or greater than the initial 10 cm radio background. Its detection can be indicative of significant radio noise in association with a solar flare. This noise is generally short-lived but can cause interference for sensitive receivers, including radar, GPS, and satellite communications.
The source region is located in the northeast quadrant, reducing the likelihood of an Earth-directed CME. Coronagraph imagery was not available at the time of publication, and it remains unclear at this time whether any Earth-directed component is present.
Radio frequencies were forecast to be most degraded over North and South America at the time of the flare.
The region has ‘beta-gamma’ magnetic configuration and is capable of producing more strong to major eruptions on the Sun. As it rotates into a geoeffective position in the days ahead, Earth-directed CMEs will become more likely.
Solar activity was at high levels in 48 hours to 12:30 UTC today, due to a long-duration M5.0 solar flare at 10:11 UTC on November 3, also from Region 4274.
The other flare producer in the period was Region 4272 (‘beta’), with a single M-class flare and multiple C-class flares. Its general structure, however, has remained relatively stable.
Other notable regions on the Sun include 4273 (‘beta-gamma’), which emerged rapidly around 03:00 UTC on November 2.
This region formed a ring-like structure with multiple spots in its intermediate region. However, despite its rapid evolution, it has been quiet with regard to flare activity, except for C1.9 flare at 11:14 UTC today.
There were two CMEs associated with the M1.6 flare at 09:25 UTC on November 3 and the aforementioned M5.0.
“Both CMEs were modelled with the bulk of the ejecta expected to pass behind Earth. However, the magnetic cloud will interact with an approaching coronal hole (CH) high speed stream (HSS), and the two are expected to arrive on November 6 to 7,” NOAA Space Weather Prediction Center (SWPC) forecasters said.
Due to the complexity of Region 4274 and its current activity, flare probabilities have increased to 60% for M-class flares (R1-R2, Minor-Moderate) and 10% for X-class (Strong).
The greater than 2 MeV electron flux is expected to remain at moderate to high levels through November 6. There is a slight chance for an S1 – Minor solar radiation storm due to the flare potential of Region 4274.
Solar wind parameters will continue to reflect waning conditions of coronal hole high speed stream (CH HSS) over the coming days. The next HSS associated with the CH currently near the central meridian is expected to become geoeffective on November 6 and 7. Also, the November 3 CMEs associated with the M-class flares from Region 4274 are expected to arrive late November 6 into 7, providing enhanced solar wind parameters.
The geomagnetic field will diminish to quiet to unsettled levels on November 4 and 5. The field is forecast to become enhanced late November 6 due to CME/HSS arrival. A G1 – Minor geomagnetic storming Watch has been issued for November 6.
Today’s X1.8 is the first solar flare since the impulsive X1.9 from Active Region 4114 at 23:50 UTC on June 19, 2025.
References:
1 Forecast Discussion – NOAA/SWPC – 12:30 UTC on November 4, 2025