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National Oceanic and Atmospheric Administration

Thursday, September 18, 2025 23:35:09 UTC

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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 Storms still possible overnight

G1 (Minor) Geomagnetic Storms still possible overnight
published: Wednesday, August 19, 2015 14:55 UTC

The CME that produced G3 (Strong) geomagnetic storms on August 15th, 2015 seems to have moved past the Earth. However, we are still under the influence of a high speed solar wind stream from coronal hole 88 (CH 88) and G1 (Minor) geomagnetic storms are possible in the evening to overnight hours. A G1 Watch has been issued for the UTC day of August 17th to reflect this activity. Stay tuned here for updates!