A powerful X1.0 X-ray event occurred on June 3, 2026, triggering an R3 (Strong) radio blackout across significant portions of Earth's sunlit side. The event, which began at 11:19 UTC and peaked at 11:28 UTC, caused a wide area blackout of high-frequency (HF) radio communication for approximately one hour.
Originating from location N17W19, this solar flare prompted the use of the GOES-19 satellite for observations due to an outage with GOES-18. The R3 classification signifies strong impacts, particularly affecting communications at the sub-solar point.