Strong M9.3 solar flare erupts at 01:36 UTC on June 3, 2026

A strong M9.3 solar flare erupted at 01:36 UTC on June 3, 2026.

Today’s flares include multiple C-class and three M-class flares, with the largest being an M3.3 flare peaking at 16:42 UTC on June 2. No X-class flares were reported. There are no edited event listings for June 3, 2026 in the latest event summary.

In 24 hours to 00:30 UTC on June 3, solar activity reached moderate levels with frequent C-class and three separate M-class flares. The largest event was an M3.3 flare at 16:42 UTC on June 2. Activity was primarily driven by several active regions exhibiting new flux emergence and complex polarities. Several narrow C-class eruptions from region 4455 and a far-sided eruption were observed; no Earth-directed CMEs were confirmed.

Solar activity is expected to remain at low to moderate levels through June 5, with a high chance for additional M-class flares (R1-R2 – Minor-Moderate) and a slight chance for X-class flares (R3 – Strong or greater), mainly 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 stay at low to moderate levels through June 5, with protons anticipated to continue at background levels barring major eruptions.

Solar wind parameters reflected slightly elevated background conditions due to the remnants of a negative polarity coronal hole high-speed stream. The total magnetic field averaged 6 nT and the Bz component reached -7 nT. Solar wind speeds held around 400 km/s. Solar wind conditions are forecast to decline to background levels early on June 3, with minor enhancements possible from previous CME influences. More significant enhancements are likely late on June 3 or early June 4 as a co-rotating interaction region and positive polarity coronal hole high-speed stream approach, with elevated conditions persisting through June 5.

The geomagnetic field was quiet over the past 24 hours. Quiet to unsettled geomagnetic conditions are expected on June 3, with a small chance for isolated active periods, mainly due to low-confidence CME and CIR effects. Unsettled to active conditions, with a chance for isolated G1 – Minor geomagnetic storms, are anticipated for June 4–5 due to coronal hole high-speed stream influences and the potential arrival of a CME related to the recent M3.3 flare.