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National Oceanic and Atmospheric Administration

Monday, April 21, 2025 00:52:07

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NOAA Scales mini

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Space Weather Conditions
on NOAA Scales
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.
More about the NOAA Space Weather Scales

Shock Arrival on 6 Sep at 2308 UTC from 4 September CME

CME shock arrival at 6/2308 UTC
Shock Arrival on 6 Sep at 2308 UTC from 4 September CME
published: Saturday, September 09, 2017 01:56 UTC

The coronal mass ejection (CME) from 4 September, 2017 arrived at the DSCOVR spacecraft on 6 September at 2308 UTC (1908 ET). A sudden impulse was observed at several of Earth's magnetometers on 6 September at 2348 UTC (1948 ET) due to effects from the shock arrival at Earth. While solar wind speed initially reached speeds of around 600 km/s and total interplanetary magnetic field strength (IMF) increased to around 14 nT, the Bz component was directed northward in the early stages of the event - an unfavorable orientation for escalating geomagnetic responses. However, the potential for geomagnetic storming still exists as the CME continues passing over Earth. Keep checking our SWPC website for the latest alerts, warnings and updates.