(written as Aurora)Display of lights in the sky, usually best seen in polar areas and called Aurora Borealis in the northern hemisphere and Aurora Australis in the southern. The aurora is caused by the interaction between the solar wind and the upper atmosphere and is especially active when the Sun itself is. The particles of the solar wind are funnelled into the polar regions by the Earth’s magnetic field.
- A luminous phenomenon of the upper atmosphere occurring mostly in the high latitudes of both hemispheres. That is, around the north and south magnetic poles. In the northern hemisphere auroras are called aurora borealis, or northern lights, and in the southern hemisphere they are called aurora astralis, or southern lights. They are caused by the interaction of excited particles from space with particles of the upper atmosphere. Auroras can take any of several forms, such as arcs, bands, or patches, and usually affect radio communications.