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National Oceanic and Atmospheric Administration

Thursday, August 21, 2025 19:41:42

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Space Weather Conditions
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24-Hour Observed Maximums
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Latest Observed
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R1-R2 --
R3-R5 --
S1 or greater --
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R1-R2 --
R3-R5 --
S1 or greater --
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R1-R2 --
R3-R5 --
S1 or greater --
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Current Space Weather Conditions
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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.
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Speedy CME Erupts from the Far-Side of the Sun on 21 Aug

Speedy CME Erupts from the Far-Side of the Sun on 21 Aug
Speedy CME Erupts from the Far-Side of the Sun on 21 Aug
published: Thursday, August 21, 2025 19:00 UTC

During the early morning hours of 21 Aug, a fairly fast coronal mass ejection (CME) erupted from the far-side of the Sun. Initial measurements of the estimated speed suggest it could be traveling at over 3,000,000 mph. If this CME had been Earth-directed, this means the CME could have arrived in close to 24 hours. The GOES-19 CCOR-1 imagery showed very clearly the movement and progression of this CME. The suspected source for this CME could possibly rotate into Earth-view in the next 3-4 days and our SWPC forecasters will be diligently searching for any evidence of such a feature. Stay informed by visiting our website.