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Well-Known Member
On August 18th, Northern Lights appeared as far south as California and Arizona in the United States. The display was a surprise. It was triggered by the interplanetary magnetic field (IMF), which unexpectedly tilted south after a knotty magnetic structure in the solar wind drifted past our planet. South-pointing IMFs promote strong geomagnetic activity
http://www.spaceweather.com/
http://www.spaceweather.com/