X1.2 solar flare erupts on June 17, 2025

A major X1.2 solar flare erupted at 21:49 UTC on June 17, 2025.

This X1.2 event began at 21:38 UTC, peaked at 21:49 UTC, and ended at 21:54 UTC. It was detected by GOES X-ray sensors. Today’s flares include several C-class and M-class events, with the most notable being a C4.1 from region 4113 at 00:53 UTC, a C6.8 from region 4114 at 01:26 UTC, a C9.9 at 06:21 UTC, a C5.5 at 08:13 UTC, and the major X1.2 flare at 21:49 UTC.

In 24 hours to 12:30 UTC on June 17, solar activity was at moderate levels, dominated by a M1.1 flare peaking at 14:55 UTC on June 16 and several C-class flares, the largest being a C9.9 at 06:21 UTC on June 17.

There is a chance for R1 – Minor to R2 – Moderate radio blackouts and a continued possibility for R3 – Strong flares (X-class) from June 17 to June 19, mainly from AR 4114 and AR 4115.

There are currently 8 numbered active regions on the Earth-side of the Sun: AR 4105 (S14W98 – Beta), AR 4109 (S17W90 – Beta), AR 4110 (N05W83 – Beta), AR 4111 (N15W26 – Beta), AR 4113 (N10W09 – Alpha), AR 4114 (N18W01 – Beta-Gamma-Delta), AR 4115 (N21E12 – Beta), AR 4116 (S11W03 – Beta).

Over the past 24 hours, greater than 2 MeV electron flux was at normal to moderate levels, and greater than 10 MeV proton flux remained at background values. The electron flux is forecast to reach moderate to high levels through June 19 under influence of a coronal hole high speed stream. There is a chance for elevated proton flux on June 17 due to activity related to AR 4114, decreasing through June 19.

Solar wind parameters continued to reflect the influence of a coronal hole high speed stream, with total magnetic field around 7–10 nT, north-south Bz from +8 to -5 nT, and speeds 470–520 km/s. These conditions are forecast to continue through June 19, with a slight chance of an enhancement on June 18 from a CME-related interplanetary shock.

The geomagnetic field was quiet over the past 24 hours. Coronal hole high speed stream activity is expected to cause unsettled to isolated active periods through June 19, with a slight chance for a G1 – Minor geomagnetic storm on June 18 due to the possible arrival of an interplanetary shock.