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National Oceanic and Atmospheric Administration

Tuesday, April 08, 2025 14:15:25 UTC

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NOAA Scales mini

R1 (Minor) Radio Blackout Impacts
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HF Radio: Weak or minor degradation of HF radio communication on sunlit side, occasional loss of radio contact.
Navigation: Low-frequency navigation signals degraded for brief intervals.
More about the NOAA Space Weather Scales

What is a geomagnetic storm?

What is a geomagnetic storm?
published: Friday, March 20, 2015 00:04 UTC

For general information about geomagnetic storms, click here.