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National Oceanic and Atmospheric Administration

Thursday, April 18, 2024 13:16:12

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NOAA Scales mini

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Space Weather Conditions
on NOAA Scales
24-Hour Observed Maximums
R
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S
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G
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Latest Observed
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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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no data
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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

Two Possible Earth-directed CME events on 16 December

Two CME events on 16 December may be Earth-directed
Two Possible Earth-directed CME events on 16 December
published: Sunday, December 20, 2015 14:04 UTC

Two coronal mass ejection (CME) events took place on 16 December. The first was associated with a C6 x-ray flare at 0903 UTC (0403 ET). The second was from a coronal disruption from the southeast quadrant of the Sun. The second CME was first seen in available coronagraph imagery at 1424 UTC (0924 ET). Both CMEs have been analyzed as assymetric full-halo events and are expected to have Earth-directed components.