Minor C7.4 solar flare erupts at 21:02 UTC on June 27, 2026

A minor C7.4 solar flare erupted at 21:02 UTC on June 27, 2026.

Today’s flares include multiple C-class events, with notable examples such as a C5.7 flare at 12:48 UTC and a selection of other minor events across active regions. There are no recorded M- or X-class events for June 27, 2026.

In 24 hours to 12:30 UTC on June 27, solar activity was at low levels, with the largest event being a C5.7 flare. Several other C-class events also occurred. No stronger flares were observed.

Solar activity is expected to remain at predominately low levels for June 27–29, with a chance for moderate M-class flares and a slight chance for major X-class flares, mainly due to active regions 4475 and 4478.

Active sunspot regions presently observed on the Earth-facing solar disk include AR 4475 (S09W06 – Beta-Gamma), AR 4476 (N08W29 – Beta), AR 4477 (S13E27 – Beta), AR 4478 (S06E46 – Beta-Gamma-Delta), and AR 4479 (N16E31 – Beta).

Over the past 24 hours, the greater than 2 MeV electron flux reached high levels, with a maximum of 1 636 pfu. The greater than 10 MeV proton flux remained at background levels. The electron flux is expected to remain moderate to high through June 29, while proton flux should stay at background levels.

During the period, solar wind parameters were slightly elevated due to weakening high speed stream influences from a negative polarity coronal hole. Total magnetic field strength averaged 5 nT, with wind speeds gradually decreasing from around 650 km/s to 560 km/s. Conditions are forecast to return to more typical levels by June 29, after a CME passage anticipated on June 28.

The geomagnetic field was quiet to unsettled over the past day. Periods of active geomagnetic conditions are likely on June 27–28, related to high speed stream and CME influences, with a return to quiet levels expected by June 29.