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Space Weather Prediction Center

National Oceanic and Atmospheric Administration

Wednesday, May 21, 2025 17:51:47 UTC

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NOAA Scales

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Space Weather Conditions
on NOAA Scales
24-Hour Observed Maximums
R1
minor
S
none
G
none
Latest Observed
R
none
S
none
G
none
Predicted 2025-05-21 UTC
R1-R2 35%
R3-R5 5%
S1 or greater 1%
G
none
Predicted 2025-05-22 UTC
R1-R2 35%
R3-R5 5%
S1 or greater 1%
G
none
Predicted 2025-05-23 UTC
R1-R2 35%
R3-R5 5%
S1 or greater 1%
G
none
1
2
3
PrevNext
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R
none
S
none
G
none
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: 593 km/sec
  • Solar Wind Magnetic Fields: Bt 6 nT, Bz 1 nT
  • Noon 10.7cm Radio Flux: 119 sfu

Slider

2025 GNSS User Engagement
After Action Report of the 2024 Space Weather Simulation Exercise

Serving Essential Space Weather Communities

The Sun (EUV)

Solar Ultraviolet Image 195 Å (Angstrom)

The Aurora

Aurora ovation plot

Coronal Mass Ejections

CCOR-1 Coronagraph Image

GOES X-Ray Flux

Created with Highcharts 8.0.4SWPC Warning ThresholdABCMXChart context menuUpdated 2025-05-2117:48 UTCZoom6 Hour1 Day3 Day7 DayMay 20May 22

GOES Proton Flux

Created with Highcharts 8.0.4SWPC 10 MeV Warning ThresholdChart context menuUpdated 2025-05-2117:40 UTCZoom6 Hour1 Day3 Day7 DayMay 20May 22
Created with Highcharts 8.0.4Universal TimeKp indexChart context menuEstimated Planetary K index (3 hour data)May 19May 20May 2103:0006:0009:0012:0015:0018:0021:0003:0006:0009:0012:0015:0018:0021:0003:0006:0009:0012:0015:0018:0021:00May 2201234567890123456789Space Weather Prediction CenterBegin: Mon, 19 May 2025 00:00:00 GMT
Updated Time: 2025-05-21T12:00:00.000Z
NOAA Scales Geomagnetic Storms
Kp < 5 Kp = 5 (G1) Kp = 6 (G2) Kp = 7 (G3) Kp = 8, 9- (G4) Kp = 9o (G5)