Where They Form There are 5 different layers in the earths Atmosphere: Image from:  http://www.theozonehole.com/images/atmospbhere.gif The lowest atmospheric layer is the Troposphere, its more than 10 miles deep and contain all of the Earths weather systems. The Stratosphere layer is home to the planets shield of ozone, this layer absorbs the harmful ultraviolet radiation produced from the sun.  Blue Jets occur in the Stratosphere during thunder storms and have also been reported to occur during hail storms.  Thirty miles up is the next layer called the Mesosphere. The Mesosphere layer is where Red Sprites can be seen shooting up and downwards during lightning storms.  This layer is also where incoming metorites burn up and produce a tail when they shoot across the sky. The Thermosphere layer is where the aurora lights are formed. The last layer is the Exosphere, this is the layer that gradually falls into space. Image from: http://www.spritesandjets.com/sprites-jets-diagram.jpg