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National Oceanic and Atmospheric Administration

Thursday, April 25, 2024 13:38:08

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NOAA Scales mini

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Space Weather Conditions
on NOAA Scales
24-Hour Observed Maximums
R
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Latest Observed
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R1-R2 --
R3-R5 --
S1 or greater --
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R1-R2 --
R3-R5 --
S1 or greater --
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R1-R2 --
R3-R5 --
S1 or greater --
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R
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Current Space Weather Conditions
on NOAA Scales
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

R1 (Minor) HF Radio Blackout Event on 31 May, 2023

R1 (Minor) HF Radio Blackout Event on 31 May, 2023
published: Wednesday, June 07, 2023 06:04 UTC

A slow-rising, long-lasting R1 (Minor HF Radio Blackout) event took place on 31 May, 2023. The R1 event was associated with an M4.2 flare which began at 2147 UTC (5:47 pm EDT) and eventually peaked at 2252 UTC (6:52 pm EDT) on 31 May, 2023. The event took place from a newly rotated into view and NOAA/SWPC assigned spot complex, Region 3323. The lengthy duration of this flare was unusual and occurred when the sunlit side of the Earth was predominantly across the Pacific Ocean area - thereby restricting any HF communication issues to that geographical area. Follow our SWPC webpage for the latest information, updates and forecasts.