NASA website reports:
"...coronal mass ejection [CME] that erupted from the sun on Oct. 4, 2012 at 11:24 p.m. EDT arrived at Earth on Oct. 8 at 12:30 a.m. EDT, as observed by instruments aboard NASA's Advanced Composition Explorer (ACE) spacecraft." CME caused geomagnetic storms when it reached Earth's magnetosphere, resulting in Auroras. A description of
Auroral mechanism at
Wikipedia provides interesting details on different colors. Ray McKenzie captured image (picture) of awe-inspiring Aurora in early hours of Oct 8, 2012 in the skies over Saskatoon, Saskatchewan.
More stunning Auroras captured for your viewing pleasure at Universe Today!
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