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EARTH SCIENCE SERVICES > ENVIRONMENTAL ADVISORIES > SPACE WEATHER ADVISORIES > AURORA FORECASTS
Definition:
Forecasts that help scientists predict the occurance of aurora. An aurora is
the bright emission of atoms and molecules in Earth's polar upper atmosphere
that appears as permanent, ring shaped belts called the auroral oval around the
north and south magnetic poles. Aurora are associated with a global electrical
discharge process triggered by solar wind disturbances. The emissions are
caused by energetic particles from Earth's magnetotail region impinging on the
upper atmosphere. Aurora occur about 70 miles above Earth's surface. Contrary
to popular belief, they do not produce any sounds.
Reference:
Adapted from Space Weather Center,
http://www.spaceweathercenter.org/glossary/001/01.html
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