Sep 10, 2008

Amazing Scene of Creation - Aurora

Aurora Borealis(in north) /Aurora Australis(in south), a luminous atmospheric phenomenon that generally appear as bright colorful bands of light commonly referred to as the southern and northern lights, occur in the ionosphere. Auroras are often visible in the night sky in both the northern and southern regions of the Earth. The aurora was named after the Roman goddess of dawn, and was long thought to be produced by sunlight reflected from polar snow and ice, or refracted light much like rainbows. Auroras are caused by high energy particles from the solar wind that is trapped in the Earth's magnetic field . As these particles spiral back and forth along the magnetic field lines, they come down into the atmosphere near the north and south magnetic poles where the magnetic field lines disappear into the body of the Earth. The delicate colors are caused by energetic electrons colliding with oxygen and nitrogen molecules in the atmosphere. This excites the molecules, and when they decay from the excited states they emit the light that we see in the aurora















Alaska is by far the best place in the USA to see northern lights that too in the months of September and March, as the Earth is in the zone of maximum solar activity during that period. The aurora is most active late at night or early in the morning, when the sky is clear and the air chilly.
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