1. Environment Northern lights Katrin Vestrik Form 9a

2. What are the northern lights ?  Natural lights in the sky  Observe in the night  In northern latitudes  Oxygen and nitrogen emissions  The collision of solar wind and magnetospheric particles

3.  In northern latitudes, the effect is known as the northern lights, named after the Roman goddess of dawn, and the Greek name for the north wind.  Green or brownish-red, depending on the amount of energy absorbed.  Blue or red. Blue if the atom regains an electron after it has been ionized. Red if returning to ground state from an excited state.  The Earth is constantly immersed in the solar wind.

5. Keypoints  Natural light in the sky  Observe in the night  In northern latitudes  lower latitudes  oxygen emissions  nitrogen emissions  first mentioned  solar wind  magnetosphere  Geomagnetic storms

6. References  http://en.wikipedia.org/wiki/Aurora_%28a stronomy%29 http://en.wikipedia.org/wiki/Aurora_%28a stronomy%29