Boulder, Colo. – The NOAA Space Weather Prediction Center (SWPC) has reported a strong X1.9-class solar flare that peaked at 01:49 UTC on December 1, 2025. The flare originated from a newly emerging, unnumbered active region rotating into view on the Sun’s northeast limb.
The event reached an R3 (Strong) classification on the NOAA radio blackout scale, meaning high-frequency (HF) radio communications may have experienced temporary signal loss across the sunlit side of Earth for several minutes.
SWPC scientists are currently analyzing data to determine if a coronal mass ejection (CME) accompanied the flare, which could lead to geomagnetic activity in the coming days if Earth-directed.
Updates on the event and any potential space weather impacts will be shared as new imagery and analysis become available on the NOAA SWPC website.
