NOAA’s Space Weather Prediction Center (SWPC) says solar activity is “high and intensifying,” and radio blackouts reaching the R3 levels have been observed over the past 24 hours. An R3 event can cause a wide-area blackout of HF radio communication and a loss of radio contact for about an hour on Earth’s sunlit side. Low-frequency navigation signals may be degraded for about an hour as well. A…
American Radio Relay League | Ham Radio Association and Resources