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Space Weather Prediction Center

National Oceanic and Atmospheric Administration

Saturday, November 23, 2024 16:49:03

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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
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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 --
G
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

G1 (Minor) Geomagnetic Storm Warning Issued

G1 (Minor) Geomagnetic Storm Warning Issued
published: Monday, December 21, 2015 08:45 UTC

A shock was observed at the ACE satellite at 15:28 UTC on the 19th (10:28 AM EST).  The shock is likely the first of the two halo CMEs observed lifting off the Sun on 16 Dec.  A subsequent geomagnetic sudden impulse was observed at 16:17 UTC (14 nT at the Boulder magnetometer).  A G1 (Minor) geomagnetic storm warning has been issued for the rest of the UTC day.