Moderate M1.0 solar flare erupts at 04:02 UTC on August 25, 2026

A moderate M1.0 solar flare erupted at 04:02 UTC on August 25, 2026.

Today’s flares include an M1.9 event from Region 4513, which began at 01:04 UTC, peaked at 01:26 UTC, and ended at 01:40 UTC.

In 24 hours to 00:30 UTC on August 25, solar activity reached moderate levels due to an M1.7 flare. Slight growth and separation occurred in multiple regions, with no X-class flares reported.

Solar activity is expected to be at low levels, with a chance for M-class flares (R1–R2 – Minor to Moderate) and a slight chance for an X-class flare (R3 – Strong or greater) for August 25–27.

Active sunspot regions presently observed on the Earth-facing solar disk include AR 4513 (N04E10 – Beta-Gamma-Delta), AR 4515 (S08E23 – Alpha), AR 4516 (N17W55 – Beta), and AR 4517 (N10W03 – Beta).

Over the past 24 hours, the greater than 2 MeV electron flux reached high levels with a peak flux of 1,640 pfu. The greater than 10 MeV proton flux remained elevated below S1 – Minor thresholds, ranging from 2–4 pfu. The greater than 2 MeV electron flux is expected to remain high on August 24–27, with a chance for the greater than 10 MeV proton flux to reach S1 – Minor levels on August 25. A slight decrease in probabilities is expected on August 26–27.

Solar wind parameters were at nominal levels over the past 24 hours, with average solar wind speeds around 365 km/s. These nominal conditions are forecast to continue through midday on August 27, followed by an enhancement to 500–600 km/s due to positive polarity coronal hole high-speed stream effects.

The geomagnetic field was quiet to unsettled during the previous 24 hours under an ambient solar wind environment. Mostly quiet geomagnetic conditions are expected through midday on August 27, with unsettled to active levels and a chance for G1 – Minor storm levels mid to late on August 27 due to coronal hole high-speed stream onset.