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National Oceanic and Atmospheric Administration

Saturday, April 20, 2024 00:21:46

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NOAA Scales mini

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Space Weather Conditions
24-Hour Observed Maximums
R
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S
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G
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Latest Observed
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S
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R1-R2 --
R3-R5 --
S1 or greater --
G
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R1-R2 --
R3-R5 --
S1 or greater --
G
no data
R1-R2 --
R3-R5 --
S1 or greater --
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no data
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R
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Current Space Weather Conditions
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

R2 (Moderate HF Radio Blackout Event on 21 February, 2023

R2 - 21 Feb 2023
R2 (Moderate HF Radio Blackout Event on 21 February, 2023
published: Wednesday, March 01, 2023 03:50 UTC

An M5.0 flare (R2-Moderate HF Radio Blackout) occurred on 21 February, 2023, at 5:17 pm EST (2017 UTC). The source was NOAA/SWPC Region 3234, which rotated into view yesterday and has produced earlier M-class flare (R1-Minor) events. The M5 flare was associated with a CME related radio signature - a Type II event reported by the USAF RSTN (Radio Solar Telescope Network). Initial analysis of available coronograph imagery revealed a CME just departing the northeast solar limb and first clearly noted at 21/2048 UTC. The CME will be analyzed and modeled by SWPC forecasters to determine the likelihood of an Earth-directed component as more imagery and data become available. Continue to visit our webpage for the latest information, forecasts, and updates.