Strong M7.7 solar flare erupts at 07:00 UTC on June 3, 2026

A strong M7.7 solar flare erupted at 07:00 UTC on June 3, 2026.

Today’s flares include a strong M9.3 flare from region 4455 peaking at 01:36 UTC, a C4.0 flare peaking at 00:46 UTC, a C2.0 flare peaking at 01:15 UTC, and a C1.8 flare from region 4449 peaking at 03:34 UTC. No X-class flares were reported for this interval.

In 24 hours to 00:30 UTC on June 3, solar activity reached moderate levels with frequent C-class and three M-class flares observed. The largest reported event was an M3.3 flare peaking at 16:42 UTC on June 2.

Solar activity is expected to remain at low to moderate levels through June 5, with a high chance for further M-class flaring and a slight chance for X-class events, primarily from regions 4455, 4458, 4461, and 4462.

Active sunspot regions presently observed on the Earth-facing solar disk include AR 4444 (S22W85 – Alpha), AR 4446 (S15W60 – Beta), AR 4452 (N10W0 – Beta), AR 4455 (N13W05 – Beta), AR 4457 (S08W40 – Beta), AR 4458 (S04E07 – Beta), AR 4459 (N14E21 – Beta), AR 4460 (N22W59 – Beta), AR 4461 (S20E72 – Beta), and AR 4462 (N17E75 – Beta).

Over the past 24 hours, the greater than 2 MeV electron flux at geosynchronous orbit was at low to moderate levels, peaking at 684 pfu. The greater than 10 MeV proton flux remained at background levels. The electron flux is expected to remain at low to moderate levels through June 5, with the proton flux anticipated to continue at background levels.

Solar wind parameters reflected slightly elevated background conditions, with the total magnetic field averaging near 6 nT and solar wind speeds steady near 400 km/s. Solar wind conditions are expected to gradually return to nominal background through early June 3. Minor enhancements are possible due to low-confidence glancing influences from a 30 May CME. More significant enhancements are likely late June 3 or early June 4 with the arrival of a co-rotating interaction region and high-speed stream.

Geomagnetic field conditions were quiet in the past 24 hours. Conditions are forecast to be quiet to unsettled on June 3, with a small chance for isolated active levels. Unsettled to active conditions, with a chance for isolated G1 – Minor geomagnetic storm periods, are expected on June 4-5 due to high-speed stream influences and a possible transient arrival associated with recent flare activity.