A moderate solar flare, classified as an M6.8 X-ray event, occurred on June 21, 2026, causing a limited blackout of high-frequency (HF) radio communication. The event began at 19:17 UTC, peaked at 19:29 UTC, and was observed at location S07E55 on the sun.
The NOAA Space Weather Scale rated this event as R2 - Moderate, indicating potential impacts primarily centered on the sub-solar point on Earth's sunlit side. This resulted in a limited blackout of HF radio communication lasting for tens of minutes.