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National Oceanic and Atmospheric Administration

Saturday, April 19, 2025 08:46:51

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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
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S
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G
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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
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

Coronal Mass Ejection on 28 December

SOHO/LASCO-C3 coronagraph images of 28 Dec CME
Coronal Mass Ejection on 28 December
published: Friday, January 01, 2016 16:22 UTC

An asymmetric, partial halo coronal mass ejection (CME) occurred on 28 December in association with an M1 flare (R1-Minor radio blackout) that peaked at 28/1245 UTC (0745 ET). Initial analysis indicated most of the plasma density was directed along a NW to SE vector. SWPC forecasters conducted an analytical fit and submitted it for a WSA-Enlil model run to determined the possibility of an Earth-directed component. SWPC forecasters will update this news story pending model run results and final forecast decisions.