Why does aurora happens ?
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As solar wind approaches the Earth, it meets the Earth's magnetic field. ... In the ionosphere, the ions of the solar wind collide with atoms of oxygen and nitrogen from the Earth's atmosphere. The energy released during these collisions causes a colorful glowing halo around the poles—an aurora.
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understand auroras, we need a few facts about the space around our Earth. There are many things in this space that we can't see.
One thing is the air we breathe, our atmosphere. It is really a mixture of several gases, mostly nitrogen and oxygen, with traces of hydrogen, helium and various compounds.
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