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Name: bruce s maccallum
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Date: 1993 - 1999

Why do auroras appear near the magnetic poles? Describe the ionosphere.

Ionosphere is the uppermost layer of atmosphere. It is completely ionized (hence the name ionosphere) by the radiation from the Sun and cosmic rays.

Near magnetic poles, the lines of magnetic field (of Earth) enter the atmosphere. Charged particles emitted by the Sun move along the lines of mag. field. Therefore they enter the atmosphere where the lines do -- at the magnetic poles. Here they interact with a atmosphere and produce Aurora.


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