Moderate M2.0 solar flare erupts at 12:31 UTC on October 9, 2025

A moderate M2.0 solar flare erupted at 12:31 UTC on October 9, 2025.

Today’s flares include a C1.7 event from region 4241, beginning at 05:09 UTC and ending at 05:22 UTC, as well as associated radio and solar radio bursts.

In 24 hours to 12:30 UTC on October 9, solar activity was at low levels. C-class flares were observed with decaying and evolving sunspot regions, and a coronal mass ejection occurred off the northeast limb starting near 06:30 UTC.

There is a slight chance for R1 – Minor to R2 – Moderate radio blackouts for October 9. The probability for R1-2 events increases to a low chance on October 10 as regions rotate into view.

Active sunspot regions presently observed on the Earth-facing solar disk include AR 4232 (N02W91 – Beta), AR 4236 (N10W98 – Beta-Gamma), AR 4241 (N12W52 – Beta), AR 4242 (S11W37 – Beta), AR 4243 (N19W16 – Alpha), and AR 4247 (S11W00 – Beta).

Over the past 24 hours, the greater than 2 MeV electron flux remained at high levels, peaking at 4 770 pfu, while the greater than 10 MeV proton flux remained below the S1 – Minor threshold. The electron flux is expected to remain at moderate levels through October 11, with proton flux at background levels.

Solar wind parameters reflected slightly enhanced conditions with total magnetic field strength ranging from 6 to 15 nT and predominantly southward Bz component early, followed by a shift northward. Solar wind speed averaged around 375 km/s. Nominal solar wind conditions are anticipated through October 10, with an increase in enhancement expected by late October 11 due to a recurrent, negative polarity coronal hole high speed stream.

Geomagnetic field activity was quiet to unsettled with an isolated active period. Geomagnetic conditions are expected to remain quiet to unsettled through October 10, with active levels anticipated by late October 11 as a negative polarity coronal hole high speed stream becomes geoeffective.