Moderate M1.9 solar flare erupts at 01:26 UTC on August 25, 2026

A moderate M1.9 solar flare erupted at 01:26 UTC on August 25, 2026.

Today’s flare reports do not include any additional events. No X-class or other M-class solar flares are listed for August 25, 2026.

In 24 hours to 00:30 UTC on August 25, solar activity reached moderate levels, driven by an M1.7 flare observed from region 4513 at 19:36 UTC on August 24. Additional monitoring and analysis for associated coronal mass ejections (CMEs) are underway.

Solar activity is expected to remain at low levels, with a chance for moderate M-class flares (R1–R2 – Minor to Moderate radio blackouts) and a slight chance for strong X-class flares (R3 – Strong radio blackouts or greater) over August 25 to 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, peaking at 1 640 pfu. The greater than 10 MeV proton flux remained below S1 – Minor solar radiation storm thresholds, ranging from 2 to 4 pfu. There is a chance for the greater than 10 MeV proton flux to reach S1 – Minor thresholds on August 25, with a decrease to a slight chance for S1 from August 26 to 27.

Solar wind parameters remained nominal with wind speed averaging 365 km/s, total field between 4 and 6 nT, and Bz from -4 to +4 nT. Nominal solar wind conditions are expected through midday on August 27, with enhanced conditions expected mid to late August 27 as a positive polarity coronal hole high-speed stream (CH HSS) arrives. Solar wind speeds could reach 500–600 km/s.

The geomagnetic field was quiet to unsettled during the past 24 hours in response to ambient solar wind conditions. Mostly quiet conditions are expected to continue through midday on August 27, followed by unsettled to active periods and risk for G1 – Minor geomagnetic storm levels as CH HSS effects increase later on August 27.