NOAA Logo

NWS Logo

Organizations

Space Weather Prediction Center

National Oceanic and Atmospheric Administration

Thursday, June 26, 2025 00:59:36 UTC

Main menu

NOAA Scales mini

R1 (Minor) Radio Blackout Impacts
close
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

Update: S1-S2 Warning Extended to 8 September/2359 UTC

Update: S1-S2 Warning Extended to 8 September/2359 UTC
published: Saturday, September 09, 2017 02:04 UTC

The S1-S2 (Minor-Moderate) solar radiation storm warning for the 10 MeV protons was extended and is now in effect until 8 September at 2359 UTC (8/19:59 ET). Keep checking our SWPC website for the latest alerts, warnings, and forecasts.