Minor C9.6 solar flare erupts at 13:50 UTC on October 12, 2025

A minor C9.6 solar flare erupted at 13:50 UTC on October 12, 2025.

Today’s flares include C1.5 (peak 02:47 UTC, region 4246), C1.0 (peak 06:30 UTC, region 4246), C1.6 (peak 10:43 UTC, region 4246), and C1.9 (peak 11:22 UTC, region 4248), according to event summaries. No X-class or M-class flares were reported for October 12, 2025.

In 24 hours to 12:30 UTC on October 12, solar activity was at low levels with three C-class flares, the strongest being a C2.7 at 19:15 UTC on October 11. No significant solar activity beyond these events was noted.

A slight chance for R1 – Minor to R2 – Moderate radio blackouts persists as no major active regions are expected to rotate out over the next three days.

Active sunspot regions presently observed on the Earth-facing solar disk include AR 4242 (S16W78 – Alpha), AR 4245 (S10W94 – Beta), AR 4246 (N22W03 – Beta), AR 4247 (S12W38 – Beta), AR 4248 (N07E29 – Beta), and AR 4250 (N07E31 – Beta).

Over the past 24 hours, the greater than 2 MeV electron flux remained at high levels, reaching a maximum of 2 780 pfu, before returning to normal-moderate. The greater than 10 MeV proton flux stayed at background levels. Normal to moderate electron flux is expected for the remainder of October 12, returning to high levels on October 13-14. Proton flux is forecast to remain at background levels.

Solar wind conditions were influenced by a negative polarity coronal hole high-speed stream, with speeds rising from 400 km/s to 750 km/s and interplanetary magnetic field values oscillating between 10–17 nT. Solar wind parameters are forecast to remain enhanced over October 12-14 due to the persistent stream effects.

The geomagnetic field was quiet to active during the past 24 hours. Geomagnetic conditions are expected to reach active to G1 – Minor storm levels over October 12-13, with unsettled conditions likely on October 14 as coronal hole stream effects diminish.