Moderate M1.4 solar flare erupts at 21:40 UTC on June 29, 2026

A moderate M1.4 solar flare erupted at 21:40 UTC on June 29, 2026.

Today’s flares include a C5.1 flare in Region 4479 at 00:41 UTC, a C3.0 flare in Region 4475 at 02:50 UTC, a C4.1 flare in Region 4478 at 03:40 UTC, a C6.5 flare in Region 4479 at 07:58 UTC, a C8.1 flare in Region 4479 at 08:28 UTC, and a C6.1 flare in Region 4475 at 17:40 UTC, among multiple low and mid-level C-class events from several active regions.

In 24 hours to 12:30 UTC on June 29, solar activity was at low levels, with multiple C-class flares produced by active regions including 4475, 4478, and 4479. Region 4475 showed signs of decay, Region 4478 experienced minor decay and separation, and Region 4479 showed significant development, with several intermediate spots and a delta configuration.

Solar activity is expected to remain predominantly low on June 29-30 and July 1, with isolated M-class flares (R1–R2 – Minor to Moderate) likely and a slight chance for X-class flares (R3 – Strong or greater), mainly from Regions 4475 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, greater than 2 MeV electron flux reached high levels, with a maximum of 2 627 pfu recorded at 17:00 UTC on June 28. The greater than 10 MeV proton flux was at background levels. The elevated electron flux is expected to persist at moderate to high levels over June 29-30 and July 1, while proton flux should remain at background levels.

Solar wind parameters have returned to near background levels, with total magnetic field strength averaging 4 nT, no significant southward Bz deflections, and solar wind speeds settling under 400 km/s. Background levels are expected to persist for most of June 29, with enhanced conditions anticipated late June 29 to midday June 30 due to a coronal mass ejection (CME) from June 26, and further enhancements are likely on July 1 as another CME arrives.

The geomagnetic field was quiet during the past 24 hours. Quiet conditions are expected for most of June 29, followed by unsettled to active levels with likely isolated G1 – Minor storm conditions and a slight chance for G2 – Moderate storms by early June 30. Quiet to unsettled levels with isolated active periods and a chance for G1 – Minor storms are possible on July 1 as well.