Northern Lights Goes Nuts In Nebraska Posted by michael on Tuesday November 16, 2004 @09:17AM from the purty-colors dept. ciMedia writes "By far the most amazing photo adventure of the northern lights. These lights lasted into early morning."
This may be of interest to some: http://sec.noaa.gov/pmap/
Contains forecasts and historical data plots.
Phil
They're caused by high energy particles colliding with the upper atmosphere... check Wikipedia if you want more info.