United States — A strong R3-level solar flare erupted Tuesday morning from an active sunspot region on the Sun, prompting monitoring for potential communication disruptions, according to NOAA’s Space Weather Prediction Center.
The flare, classified as an X1.5 event, erupted from Solar Active Region 4366 at approximately 9:08 a.m. Eastern Time. NOAA scientists said the sunspot group remains magnetically complex, making additional solar flares of at least the R1 level likely in the near term.
Solar flares are sudden eruptions of energy from the Sun, measured in X-ray flux. Events of this magnitude can cause immediate but temporary impacts to high-frequency (HF) radio communications, particularly across the sunlit side of Earth. NOAA said users of HF radio signals may experience signal degradation or brief loss of contact lasting from several minutes to a couple of hours.
Officials noted there is currently no clear evidence that this flare produced a coronal mass ejection (CME), which would increase the potential for geomagnetic impacts such as auroras or power grid disturbances.
Since emerging in late January, Active Region 4366 has produced numerous flares across multiple intensity levels, including C-class, M-class, and X-class events, making it one of the more active regions observed so far this year.
The Space Weather Prediction Center said it will continue to monitor the region closely and issue updates as conditions evolve. Additional information and real-time space weather data are available at spaceweather.gov.
For aviation, maritime operators, and amateur radio users, officials recommend staying alert for short-term communication disruptions during periods of heightened solar activity.
