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Polarlichtwarnungen der letzten 7 Tage ( → 24 Stunden )
(Quelle: ftp://ftp.swpc.noaa.gov/pub/forecasts/oldALTS.txt)

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Space Weather Message Code: ALTK04
Serial Number: 2253
Issue Time: 2021 Nov 29 0256 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2021 Nov 29 0247 UTC
Synoptic Period: 0000-0300 UTC
Active Warning: Yes
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.