Minor C8.0 solar flare erupts at 19:08 UTC on October 13, 2025

A minor C8.0 solar flare erupted at 19:08 UTC on October 13, 2025.

Today’s flares include two moderate M-class events: an M1.9 flare peaking at 05:26 UTC and an M2.7 flare peaking at 09:19 UTC, both originating from region 4246. Multiple minor C-class flares were also documented from regions 4246 and 4248 throughout the day.

In 24 hours to 12:30 UTC on October 13, solar activity reached moderate levels with two M-class flares and several C-class flares observed from active regions 4246 and 4248, while the other regions displayed stable or decaying characteristics.

Solar activity is likely to continue at low levels, with a chance for R1 – Minor to R2 – Moderate radio blackouts (from M-class flare occurrence) through October 15.

Active sunspot regions presently observed on the Earth-facing solar disk include AR 4245 (S10W0, Beta), AR 4246 (N24W16, Beta-Gamma), AR 4247 (S12W52, Beta), AR 4248 (N06E15, Beta-Gamma), AR 4250 (N06E20, Beta), AR 4251 (N19E40, Alpha), AR 4252 (S13E66, Alpha), and AR 4253 (S17W10, Beta).

Over the past 24 hours, the greater than 2 MeV electron flux reached high levels, with a maximum of 1 710 pfu observed. The greater than 10 MeV proton flux remained at background levels. The greater than 2 MeV electron flux is expected to stay above 1 000 pfu through October 15, while the proton flux is forecast to remain at background levels.

In the past 24 hours, solar wind conditions were indicative of a negative polarity coronal hole high speed stream, with total interplanetary magnetic field peaking at 9 nT and solar wind speeds decreasing from roughly 800 km/s to below 700 km/s. These enhanced solar wind parameters are expected to persist through October 14, with a minor increase possible on October 15 due to a passing CME from October 11.

During the previous 24 hours, the geomagnetic field reached G1 – Minor storming levels during three periods: 18:00–21:00 UTC on October 12, and 00:00–03:00 UTC and 03:00–06:00 UTC on October 13. Active to G1 – Minor storm conditions are forecast to continue until October 13, followed by unsettled conditions on October 14, and unsettled to active levels on October 15 due to potential CME influence.