Minor C8.1 solar flare erupts at 08:28 UTC on June 29, 2026

A minor C8.1 solar flare erupted at 08:28 UTC on June 29, 2026.

Today’s flares include a C5.1 flare from region 4479 (peak 00:41 UTC), C3.1 from region 4479 (peak 02:32 UTC), C3.0 from region 4475 (peak 02:50 UTC), C4.8 from region 4479 (peak 03:17 UTC), and C4.1 from region 4478 (peak 03:40 UTC). No M- or X-class flares were observed.

In 24 hours to 00:30 UTC on June 29, solar activity remained at low levels, dominated by C-class flare activity. The largest event observed in this window was a C9.5 flare at 21:17 UTC on June 28. Several small C-class flares were reported from regions 4475, 4478, and 4479. No Earth-directed coronal mass ejections were identified.

Solar activity is expected to remain at predominantly low levels on June 29 to July 1, with a chance for M-class flares (R1-R2 – Minor to Moderate radio blackouts) and a slight chance for X-class flares (R3 – Strong or greater radio blackouts), mainly from regions 4475, 4478, and 4479.

Active sunspot regions presently observed on the Earth-facing solar disk include AR 4475 (S10W33 – Beta-Gamma), AR 4476 (N08W58 – Alpha), AR 4477 (S14W00 – Beta), AR 4478 (S06E20 – Beta-Gamma-Delta), AR 4479 (N16E02 – Beta), and AR 4480 (S18W05 – Beta).

Over the past 24 hours, the greater than 2 MeV electron flux reached high levels, with a maximum of 2 627 pfu observed at 17:00 UTC on June 28. The greater than 10 MeV proton flux remained at background levels. Elevated to moderate or high electron flux is expected to persist through July 1, with protons remaining at background levels.

Solar wind parameters in the past 24 hours reflected a weakening negative polarity coronal hole high speed stream. Magnetic field strength remained between 2 and 4 nT, while Bz fluctuated between ±3 nT. Solar wind speed decreased from 555 km/s to around 425 km/s. The solar wind environment is anticipated to return to background conditions for most of June 29, before becoming enhanced again late on June 29 through July 1 as a result of an anticipated CME arrival.

The geomagnetic field was quiet over the last 24 hours. Mostly quiet geomagnetic conditions are forecast for most of June 29, followed by unsettled to active periods later on June 29 into early June 30, including likely isolated G1 – Minor storm intervals due to an approaching CME. For July 1, quiet to isolated active levels are expected as CME effects wane.