极光的英文介绍演示PPT课件

1、 The aurora of Earth is produced by excitating (or ionizating) atomic or upper atmospheric Molecular that are from the Earths magnetosphere or flow of charged particles of solar. There are three conditions To generate aurora: Atmospheric, magnetic and the solar wind. In the solar system ,aurora is n

2、ot just appeared on the Earth. Some planets that have magnetic field also have aurora.第1页/共13页There are many ancient story about aurora. For example: In a ancient Chinese book named “Shan hai jing”,aurora has been recorded. It says that an immoral living in the north has a shape that likes a red sna

3、ke. It can twinkle in sky at night. People call it Chu Long, whith, In fact, is aurora.第2页/共13页第3页/共13页第4页/共13页第5页/共13页第6页/共13页第7页/共13页幻日幻日第8页/共13页 Sun dogs is an optical phenomenon of the atmos- phere. there are a lot of hexa- gonal columnar crystals of ice floating in translucent thin clouds of sk

4、y. The crystals of ice occasionally arranges vertically in the air. When the sun light goes through the hexagonal ice, light will be refract in a order. 第9页/共13页 When the ice crystals appear near the sun rising or sun set, three branches of light from the icicles will inflect into humans eyes. The middle of the light is from the real sun, the others are indexed lights. But in peoples eyes, there are more than a sun in the sky, which are a