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Space Weather Prediction Center

National Oceanic and Atmospheric Administration

Thursday, November 23, 2017 18:11:32

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NOAA Scales mini

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Space Weather Conditions
24-Hour Observed Maximums
R
no data
S
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G
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Latest Observed
R
no data
S
no data
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
R1-R2 --
R3-R5 --
S1 or greater --
G
no data
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R
no data
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no data
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Current Space Weather Conditions
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

UPDATE: S1 Solar Radiation Storm In Progress But Trending Down

UPDATE: S1 Solar Radiation Storm In Progress But Trending Down
published: Saturday, October 31, 2015 19:51 UTC

S1 (Minor) Solar Radiation Storms are in progress but beginning to show signs of recovery. The greater than 10 MeV threshold of 10 pfu was reached at 0550 UTC (1:50 am ET) on 29 October 2015. Additionally, a warning was issued for the 100 MeV proton flux at or above 1 pfu and was valid from 29/0445 UTC until 29/1400 UTC. The alert threshold of 1 pfu was reached at 29/0435 UTC but 100 MeV levels have since dropped below 1 pfu and the warning has expired. This activity is a result of a coronal mass ejection (CME) that occurred from just beyond the SW limb of the Sun at around 29/0219 UTC; as noted by radio signatures known as Type II and Type IV sweeps. 10 MeV Proton levels are expected to fall below threshold shortly and, outside of another back-sided event, return to background conditions over the next 24 hours. Stay tuned for updates!