Minor C7.2 solar flare erupts at 16:53 UTC on October 13, 2025

A minor C7.2 solar flare erupted at 16:53 UTC on October 13, 2025.

Today’s flares include C6.4 (begin 00:02 UTC, end 00:17 UTC, region 4246), C9.3 (begin 00:17 UTC, end 00:51 UTC, region 4246), C2.3 (begin 03:53 UTC, end 04:04 UTC, region 4248), C5.8 (begin 04:04 UTC, end 04:19 UTC, region 4248), M1.9 (begin 04:59 UTC, end 05:45 UTC, region 4246), C7.6 (begin 06:49 UTC, end 07:00 UTC), C5.7 (begin 07:21 UTC, end 07:36 UTC, region 4248), C9.8 (begin 07:39 UTC, end 07:57 UTC, region 4246), M2.7 (begin 08:55 UTC, end 09:31 UTC, region 4246), C9.5 (begin 10:32 UTC, end 10:55 UTC, region 4248), C3.5 (begin 12:53 UTC, end 13:04 UTC, region 4246), and M1.2 (begin 13:04 UTC, end 13:39 UTC, region 4246).

In 24 hours to 12:30 UTC on October 13, solar activity reached moderate levels with two isolated M-class flares observed. The earlier M-flare was associated with a faint CME containing an Earth-directed component. Multiple additional C-class flares were reported.

Solar activity is likely to continue at low levels, though there is a chance for R1 – Minor to R2 – Moderate radio blackouts associated with 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, peaking at 1 710 pfu. The greater than 10 MeV proton flux remained at background levels. Elevated electron flux is expected to persist during October 13–15, with proton levels remaining at background.

Solar wind conditions showed ongoing influence from a negative polarity coronal hole high-speed stream. The interplanetary magnetic field peaked at 9 nT before decreasing to around 5 nT. Solar wind speed declined from roughly 800 km/s to under 700 km/s; temperature and density were steady. Enhanced solar wind levels are anticipated to continue through October 14 due to the high-speed stream, with possible minor enhancement from a passing CME on October 15.

The geomagnetic field reached G1 – Minor storming levels during three intervals in the past day. Active to G1 – Minor storm levels are expected through October 13 due to the high-speed stream. Conditions are likely to become unsettled on October 14 as this influence wanes, with unsettled to active levels possible on October 15 owing to potential CME effects.