Minor C9.0 solar flare erupts at 08:28 UTC on June 11, 2026

A minor C9.0 solar flare erupted at 08:28 UTC on June 11, 2026.

Today’s flares include a C6.1 flare peaking at 00:44 UTC and a C1.0 flare at 04:41 UTC, both associated with region 4465. No M-class or X-class flares have been reported.

In 24 hours to 00:30 UTC on June 11, solar activity remained at low levels with most of the C-level flares originating from region 4465. The largest reported event was a C2.6 flare on June 10 at 00:59 UTC. Several coronal mass ejections were detected, but no Earth-directed components were identified.

Solar activity is expected to remain at low levels, with a chance for M-class flares and a slight chance for X-class flares.

Active sunspot regions presently observed on the Earth-facing solar disk include AR 4456 (N18W87 – Beta), AR 4458 (S06W0 – Alpha), AR 4459 (N14W56 – Alpha), AR 4462 (N16W35 – Beta), AR 4463 (N16W04 – Alpha), AR 4464 (S12W03 – Beta), AR 4465 (N09E40 – Beta-Gamma), and AR 4466 (N06W31 – Beta).

Over the past 24 hours, the greater than 2 MeV electron flux at geosynchronous orbit remained below the 1 000 pfu threshold and the greater than 10 MeV proton flux continued at background levels. The greater than 2 MeV electron flux at geosynchronous orbit is likely to remain at low to moderate levels on June 11–12, returning to high levels on June 13. The greater than 10 MeV proton flux is expected to remain at background levels.

Solar wind speeds continued to decrease following the passage of a weak transient, reaching 374 km/s at the end of the period. The interplanetary magnetic field fluctuated around 5 nT, with Bz varying between -5 and 5 nT. The Phi angle returned to the positive sector after about 08:00 UTC on June 10. Background solar wind conditions are expected through midday on June 11 when a negative polarity coronal hole high speed stream is anticipated to become geoeffective through June 13.

The geomagnetic field has been at quiet to unsettled levels over the past 24 hours. It is expected to remain at quiet to unsettled levels on June 11, becoming unsettled to active on June 12–13 due to the anticipated impact of the negative polarity coronal hole high speed stream.