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National Oceanic and Atmospheric Administration

Wednesday, July 23, 2025 03:54:53 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.
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G2 (Moderate) Geomagnetic Storm Warning Issued/Conditions Observed

G2 (Moderate) Geomagnetic Storm Warning Issued/Conditions Observed
G2 (Moderate) Geomagnetic Storm Warning Issued/Conditions Observed
published: Friday, September 15, 2017 03:39 UTC

A G2 (Moderate) geomagnetic storm warning was issued at 14/1555 UTC as a result of anticipated effects from a positive polarity CH HSS. G2 geomagnetic storm levels were observed at 14/1759 UTC. The G2 warning remains in effect until 15/0300 UTC.