Moderate M3.3 solar flare erupts at 16:50 UTC on June 2, 2026

A moderate M3.3 solar flare erupted at 16:50 UTC on June 2, 2026.

Today’s flares include an M1.2 flare from region 4455 peaking at 10:05 UTC and an M1.2 flare from region 4461 peaking at 04:45 UTC. Numerous minor C-class events were recorded, with C3.1 and C3.7 flares from region 4455, and several C-class flares from region 4461. No X-class flares were reported.

In 24 hours to 13:00 UTC on June 2, solar activity reached moderate levels with several C-class flares and two M-class flares observed.

Solar activity is expected to remain at low levels through June 4, with a chance for isolated M-class flares (R1 – Minor to R2 – Moderate). Flaring potential is distributed across several regions, with particular interest in regions exhibiting magnetic complexity.

Active sunspot regions presently observed on the Earth-facing solar disk include AR 4444 (S22W73 – Alpha), AR 4446 (S15W48 – Beta), AR 4447 (S17W82 – Alpha), AR 4449 (S09W43 – Beta), AR 4452 (N10W89 – Beta), AR 4454 (S15W07 – Alpha), AR 4455 (N15E11 – Beta), AR 4457 (S09W27 – Beta), AR 4458 (S04E20 – Beta), and AR 4459 (N14E63 – Beta).

Over the past 24 hours, the greater than 2 MeV electron flux at geosynchronous orbit was at low to moderate levels, peaking at 551 pfu, while the greater than 10 MeV proton flux remained at background levels. The greater than 2 MeV electron flux is expected to stay at low to moderate levels through June 4. The greater than 10 MeV proton flux is expected to remain at background levels.

Solar wind parameters initially reflected nominal background conditions, with total magnetic field steady around 4 nT and solar wind speeds decreasing from 450 to 400 km/s. Around 12:30 UTC on June 1, a minor enhancement occurred with total field rising to 7 nT and southward Bz reaching -6 nT. Solar wind speeds showed a minor bump, then returned to about 400 km/s. The phi angle was predominantly negative. Solar wind parameters should continue to return to background levels through June 2. Further enhancements are possible on June 3 from a slow CME, with more significant increases likely with a co-rotating interaction region and positive-polarity coronal hole high-speed stream late June 3 or early June 4.

The geomagnetic field was mostly quiet early in the period, becoming unsettled later due to a slow-moving transient. Mostly quiet geomagnetic conditions with isolated unsettled periods are anticipated for June 2 as transient and weak negative polarity high-speed stream influences clear. Active conditions, with a chance for isolated periods of G1 – Minor geomagnetic storming, may occur over June 3–4 due to the combined effect of a low-confidence CME, preceding CIR, and a coronal hole high-speed stream.