On the evening we arrived in Iceland in February 2014 we were greeted by the most spectacular display of the Aurora Borealis I could have imagined. We tooks photographs for a full three hours (while taking snatches of our delicious evening meal) and saw the full range of colours of an aurora. The green is produced by oxygen particles about 60 miles from the earth, and the rarer red auroras are produced by high-altitude oxygen at heights up to 200 miles. It was a display without comparator.
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