Thee$ha
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 |  Subject: Northern Lights over Yellowknife Canada  Fri Mar 21, 2008 9:33 pm | |
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Ashwiny
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| | Subject: Re: Northern Lights over Yellowknife Canada Sun Mar 23, 2008 10:30 am | |
| - wikipedia wrote:
- Auroras (Polar Lights; or aurorae, sing.: aurora) are natural colored light displays, which are usually observed in the night sky, particularly in the polar zone. Some scientists call them "polar auroras" (or "aurorae polares"). In northern latitudes, it is known as the aurora borealis, named after the Roman goddess of 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 polar 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.
Auroras are produced by the collision of charged particles from Earth's magnetosphere, mostly electrons but also protons and heavier particles, with atoms and molecules of Earth's upper atmosphere (at altitudes above 80 km). The particles have energies of 1 to 100 keV. Most originate from the Sun and arrive at the vicinity of Earth in the relatively low-energy solar wind. When the trapped magnetic field of the solar wind is favourably oriented (principally southwards) it reconnects with Earth's magnetic field, and solar particles enter the magnetosphere and are swept to the magnetotail. Further magnetic reconnection accelerates the particles towards Earth.
The collisions in the atmosphere electronically excite atoms and molecules in the upper atmosphere. The excitation energy can be lost by light emission or collisions. Most aurorae are green and red emission from atomic oxygen. Molecular nitrogen and nitrogen ions produce some low level red and very high blue/violet aurorae.
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LiL RoSe
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| | Subject: Re: Northern Lights over Yellowknife Canada Sun Mar 23, 2008 7:16 pm | |
| nice n cool nauture beauty look very coollllllllllllllllllllllllllllllllllllllll | |
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Thee$ha
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| | Subject: Re: Northern Lights over Yellowknife Canada | |
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akka ninga sonnathu enaku etho pathi than purinchathu 
for da info.. I was thinking y is it green in da sky..