Artikelrobot
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Forecasters at the NOAA Space Environment Center in Boulder, Colorado observed a geomagnetic storm on Sunday, which they classified as an extreme event, measuring G5 - the highest level-on the NOAA Space Weather Scales
http://www.southgatearc.org/news/may2005/space_weather_warning.htm
http://www.southgatearc.org/news/may2005/space_weather_warning.htm