极光的英文介绍演示课件

单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,EARORA,极光,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 not just appeared,on the Earth.Some,planets that have magnetic,field also have aurora.,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 snake.It can twinkle in sky at night.People call it Chu Long,whith,In fact,is aurora.,LETS HAVE SOME PICTURES,AURORA,AURORA,AURORA,more things in the sky,幻日,SUN DOGS,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 sky.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.,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 around the biggest real sun.,SUN DOGS,Abigele Yu,