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Space Weather Prediction Center

National Oceanic and Atmospheric Administration

Thursday, April 18, 2024 17:16:57

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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 --
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

Solar Wind Shock Observed - G1 (Minor) Geomagnetic Storm Warning Issued for 16-17 July 2017

Solar Wind Shock Observed - G1 (Minor) Geomagnetic Storm Warning Issued for 16-17 July 2017
published: Tuesday, July 18, 2017 06:05 UTC

An interplanetary shock, likely associated with the arrival of a coronal mass ejection (CME) from 14 Jul, was observed in DSCOVR solar wind data at 16/0515 UTC.  A G1 (Minor) geomagnetic storm warning has been issued at is valid 16/0520-17/1500 UTC.