Tuesday, October 7, 2008
aurora - first hand
Northern lights (aurora borealis) are a phenomena caused by solar eruptions which generate solar winds.Solar winds are then directed towards the earth which is protected against magnetic storms by a magnetic belt.The solar winds enter via the northern pole and the southern magnetic pole.Northern lights are created when there are too many particles.The colors of northern lights correspond to the different gases in the ionosphere. In northern lights, oxygen atoms give off red and green light, depending on how high they are in the ionosphere. Nitrogen molecules give off blue and violet light.
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