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Space Weather Prediction Center

National Oceanic and Atmospheric Administration

Tuesday, April 29, 2025 02:18:42 UTC

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NOAA Scales

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Space Weather Conditions
on NOAA Scales
24-Hour Observed Maximums
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Latest Observed
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Predicted 2025-04-29 UTC
R1-R2 15%
R3-R5 1%
S1 or greater 1%
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Predicted 2025-04-30 UTC
R1-R2 15%
R3-R5 1%
S1 or greater 1%
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Predicted 2025-05-01 UTC
R1-R2 20%
R3-R5 1%
S1 or greater 1%
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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

Space Weather Summary

  • Solar Wind Speed: 350 km/sec
  • Solar Wind Magnetic Fields: Bt 9 nT, Bz 2 nT
  • Noon 10.7cm Radio Flux: 154 sfu

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Planetary K-index
Created with Highcharts 8.0.4Universal TimeKp indexChart context menuEstimated Planetary K index (3 hour data)Apr 27Apr 2803:0006:0009:0012:0015:0018:0021:0003:0006:0009:0012:0015:0018:0021:00Apr 2903:0006:0009:0012:0015:0018:0021:00Apr 3001234567890123456789Space Weather Prediction CenterBegin: Sun, 27 Apr 2025 00:00:00 GMT
Updated Time: 2025-04-28T21:00:00.000Z
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Kp < 5 Kp = 5 (G1) Kp = 6 (G2) Kp = 7 (G3) Kp = 8, 9- (G4) Kp = 9o (G5)
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