Glowing gasses seen above a planet's magnetic poles when charged particles in the solar wind collide with atoms in the planet's upper atmosphere.
On Earth, they are found in the Northern Hemisphere (Aurora Borealis) or the Southern Hemisphere (Aurora Australis). The colours are produced by electrified oxygen and nitrogen atoms .
They are most dramatic when solar activity reaches it's peak.
- ^ Baumann, Mary K.; Will Hopkins, Loralee Nolletti, Michael Soluri, Steven Hawking (foreword) and Ray Villard (astronomy consultant) (2007). Cosmos: Images From Here to the Edge of the Universe. London: Duncan Baird Publishers. ISBN 1844834761 Check
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| group3 = Types of dark matter | abbr3 = 3 | list3 =</div>
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