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Thursday, June 19, 2025 11:05:49 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

G2 Watch issued for 4 August; G1 Watch issued for 5 August

G2 Watch issued for 4 August; G1 Watch issued for 5 August
G2 Watch issued for 4 August; G1 Watch issued for 5 August
published: Sunday, August 06, 2017 12:23 UTC

A coronal hole high speed stream, originating from a recurrent, positive polarity coronal hole seen in the SDO/AIA 193 image above, is likely to cause geomagnetic storming at the G2 level on 4 August 2017, and at the G1 level on 5 August. Stay tuned for additional updates.