X1.9 solar flare erupts on June 19, 2025

A major X1.9 solar flare erupted at 23:50 UTC on June 19, 2025.

In 24 hours to 12:30 UTC on June 19, solar activity was at low levels. The largest and most complex region became more stable, with spot configurations in other regions showing slight decay or slow development. No Earth-directed coronal mass ejections were observed.

Moderate to strong solar flares remain likely, with a chance for major X-class events through June 21, mainly driven by a few active regions.

There are currently six numbered active regions on the Earth-side of the Sun: AR 4111 (N15W51 – Beta), AR 4113 (N10W36 – Alpha), AR 4114 (N18W26 – Beta-Gamma), AR 4115 (N20W15 – Beta-Gamma), AR 4116 (S12W29 – Beta), and AR 4117 (S16E63 – Beta).

Over the past 24 hours, the greater than 2 MeV electron flux remained elevated and near the 1000 pfu threshold due to ongoing coronal hole high speed stream influence. The greater than 10 MeV proton flux was at background levels. The elevated electron environment is expected to persist until June 20, with proton flux likely to remain at background.

Solar wind conditions reflected a positive polarity coronal hole high speed stream regime, with total field around 7–9 nT and wind speeds averaging 480–560 km/s. These conditions are forecast to continue through June 20 before gradually diminishing by June 21.

The geomagnetic field was quiet to unsettled. Conditions are expected to remain quiet to active into June 19 due to continued high speed stream effects, with minor (G1 – Minor) geomagnetic storming likely on June 20 and unsettled conditions expected again on June 21.