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• When is an aurora not an aurora? Phenomena called 'Steve' and 'picket fence' are masquerading as auroras

When is an aurora not an aurora? Phenomena called 'Steve' and 'picket fence' are masquerading as auroras

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The shimmering green, red and purple curtains of the northern and southern lights—the auroras—may be the best-known phenomena lighting up the nighttime sky, but the most mysterious are the mauve and white streaks called Steve and their frequent companion, a glowing green "picket fence."

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