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National Oceanic and Atmospheric Administration

Saturday, April 19, 2025 17:17:51

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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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S
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G
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Latest Observed
R
no data
S
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G
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R1-R2 --
R3-R5 --
S1 or greater --
G
no data
R1-R2 --
R3-R5 --
S1 or greater --
G
no data
R1-R2 --
R3-R5 --
S1 or greater --
G
no data
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R
no data
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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 radio blackout and S1-Minor solar radiation storm occurred 02 Jan

AIA 131 flare image and D-Region absorption map
R1-Minor radio blackout and S1-Minor solar radiation storm occurred 02 Jan
published: Sunday, January 03, 2016 19:41 UTC

An R1-Minor radio blackout followed by an S1-Minor solar radiation storm occurred on 02 January 2016. The flare associated with this event was a long duration M2.3 flare that originated from NOAA Region AR12473, located near the Sun's southwestern (bottom right) limb and peaked at 02/0011 UTC.  After the flare, an enhancement was observed in GOES 13 Proton Flux that crossed the NOAA Scale S1-Minor threshold at 02/0430 UTC, resulting in possible minor impacts on HF radio communications in the polar regions. SOHO/LASCO coronagraph imagery is still filtering in, but forecasters will analyze any associated coronal mass ejections (CMEs) as they appear. Stay tuned here for updates!