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National Oceanic and Atmospheric Administration

Monday, April 21, 2025 22:58:11

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NOAA Scales mini

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Space Weather Conditions
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24-Hour Observed Maximums
R
no data
S
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G
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Latest Observed
R
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S
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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
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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.
More about the NOAA Space Weather Scales

Halo CME on the Farside of the Sun

Halo CME on the Farside of the Sun
published: Wednesday, July 26, 2017 20:34 UTC

A fast, far-sided halo CME was observed beginning at 04:36 UTC on 23 July in coronagraph imagery.  The event originated from old Region 2665 (S06, L=111) which was responsible for two M-class flares during its rotation across the visible disk.  The imagery above shows the event as seen from the NASA STEREO A spacecraft (left and right images) and the coronagraph on the NASA SOHO spacecraft (center).  This CME is on the opposite side of the Sun and will not be geoeffective.