A TIMELINE OF GREAT AURORA STORMS: New research shows that great aurora storms happen on average every 40 to 60 years--a lot more often than previously thought. During these events, auroras spread almost all the way to Earth's equator. One such storm in 1770 lasted 9 consecutive days. Full Story @ Spaceweather.com.
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Above: A 500 year timeline of great aurora storms created by Delores J. Knipp (University of Colorado) and colleagues. [more]
