Auroras (or aurorae) [sing: aurora] are natural colored light displays, which are usually observed in the
night sky, particularly in the
polar zone. Some scientists therefore call them "polar auroras" (or "aurorae polaris").In northern latitudes, it is known as the aurora borealis, named after the Roman goddess of the dawn,
Aurora, and the
Greek name for north wind,
Boreas. It often appears as a greenish glow (or sometimes a faint red), as if the sun were rising from an unusual direction. The aurora borealis is also called the northern lights, as it is only visible in the North sky from the
Northern Hemisphere. The aurora borealis most often occurs from September to October and from March to April.
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