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Space Weather Prediction Center

National Oceanic and Atmospheric Administration

Thursday, April 18, 2024 14:40:41

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NOAA Scales mini

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Space Weather Conditions
on NOAA Scales
24-Hour Observed Maximums
R
no data
S
no data
G
no data
Latest Observed
R
no data
S
no data
G
no data
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
S
no data
G
no data
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 occurred

SDO/AIA 335 imagery of the M4 flare from 23 Dec
R1-Minor radio blackout occurred
published: Thursday, December 24, 2015 23:36 UTC
An R1-Minor radio blackout was observed on 23 December at 0040 UTC (1940 EDT). The flare associated with this event was an M4.4 flare that originated from NOAA Region AR12473, located near the Sun's soutwestern (bottom left) limb. SOHO/LASCO coronagraph imagery is still filtering in, but forecasters will analyze any associated coronal mass ejections (CMEs) as they appear. However, due to the location of the flare, any associated CMEs will likely not have an Earth directed component, but stay tuned here for the final analysis.