Minor C9.8 solar flare erupts at 07:47 UTC on October 13, 2025

A minor C9.8 solar flare erupted at 07:47 UTC on October 13, 2025.

Today’s flares include a C6.4 event from 00:02 to 00:17 UTC in region 4246, a C9.3 event from 00:17 to 00:51 UTC in region 4246, a C2.3 event from 03:53 to 04:04 UTC in region 4248, a C5.8 event from 04:04 to 04:19 UTC in region 4248, an M1.9 event from 04:59 to 05:45 UTC in region 4246, a C4.1 event from 06:42 to 06:49 UTC, a C7.6 event from 06:49 to 07:00 UTC, and a C5.7 event from 07:21 to 07:36 UTC in region 4248. No C9.8 event at 07:47 UTC is specifically listed in the event records provided for today.

In 24 hours to 00:30 UTC on October 13, solar activity was at low levels with the strongest event being a C9.6 flare at 13:50 UTC on October 12. Regions 4246 and 4248 remained complex and active, while other visible regions were mostly stable or decaying.

Solar activity is likely to continue at low levels over October 13–15, with a chance for R1 – Minor to R2 – Moderate radio blackouts during this interval.

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 4252 (S13E66 – Alpha), and AR 4253 (S17W10 – Beta).

Over the past 24 hours, greater than 2 MeV electron flux continued at high levels, while greater than 10 MeV proton flux remained at background levels. High levels of greater than 2 MeV electron flux are expected to persist on October 13–15, while greater than 10 MeV proton flux should remain at background levels.

Solar wind parameters reflected a transition from a corotating interaction region to a high-speed stream, with total magnetic field peaking at 16 nT. Wind speeds increased from around 500 km/s to a peak of 750 km/s early in the Universal Time day.

The geomagnetic field was at active to G1 – Minor geomagnetic storm levels over the past 24 hours. Active to G1 – Minor geomagnetic storm conditions are expected to continue on October 13, with unsettled conditions likely on October 14 as influences wane, and unsettled conditions again likely on October 15 due to a possible passing CME that departed on October 11.