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National Oceanic and Atmospheric Administration

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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.
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G1 (Minor) Geomagnetic Storm Levels Observed

G1 (Minor) Geomagnetic Storm Levels Observed
published: Sunday, July 23, 2017 11:10 UTC

G1 (Minor) geomagnetic storm levels were observed at 11:42 UTC (07:42 ET) on 22 July due to activity associated with a coronal hole high speed stream.  A G1 (Minor) storm warning is in effect until 15:00 UTC on 22 July.