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Aurora Facts Part One
Aurora Facts Part Two
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The aurora has a shape that is similar to a curtain, and the altitude of its lower edge is around 65 miles.
Auroras occur along ring-shaped regions around the north and south geomagnetic poles. Fairbanks, Alaska, is a good place for watching auroras.
Auroral light is produced by a high-vacuum electrical discharge. It is powered by interactions between the sun and earth like the neon sign. The light is glow from atoms and molecules in the earth's upper atmosphere.
The upper contains, at the lower edge of the aurora, a thin and partly ionized layer called the ionosphere. Reflected by the ionosphere, radiowaves can propagate great distances by bouncing between it and the ground.
Auroras indicate that the ionosphere and our protective atmosphere are being energized by the electric power generated in the magnetosphere. As these electrical currents are discharged in the ionosphere. Many phenomena are produced including the visible emissions we recognize as the aurora and magnetic storms.
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There's more on AURORA FACTS PART TWO
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