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National Oceanic and Atmospheric Administration

Thursday, October 19, 2017 22:15:28

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NOAA Scales mini

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Space Weather Conditions
24-Hour Observed Maximums
R
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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
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R1-R2 --
R3-R5 --
S1 or greater --
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no data
R1-R2 --
R3-R5 --
S1 or greater --
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R
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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.
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G3 (Strong) geomagnetic storming reached on 28 September

Aurora Ovation Model
G3 (Strong) geomagnetic storming reached on 28 September
published: Friday, September 29, 2017 11:15 UTC

G3 (Strong) geomagnetic storming periods were observed on 28 September, 2017. G3 levels were reached at 28/0559 UTC (28/0159 ET) and again at 28/0805 UTC (28/0205 ET). These geomagnetic storming levels were reached during prolonged and pronounced periods of favorable interplanetary magnetic field (IMF) orientation; combined with elevated solar wind speed near 700 km/s due to the influences of a coronal hole high speed stream (CH HSS). Prior to the escalation of activity to G3 storming levels, three concurrent periods of G2 (Moderate) storming occurred. For additional information regarding the CH HSS and resultant geomagnetic storming - read our forecast discussion. Also, review our SWPC webpage for the latest forecasts and alerts/warnings.