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1 E layer: The next layer beyond the D layer is called the E layer. 2  This exists at an altitude of between 100 and 125 km. 3  Instead of acting chiefly as an attenuator, this layer reflects radio signals although they still undergo some attenuation.
Click for larger image. Greenhouse Gases Absorb Infrared Radiation. Radiation from the sun is absorbed by the earth as radiant visible light. You feel this effect on a sunny day when you stand in the sunshine vs. the shade. Eventually, the heat from the earth is re-emitted into the atmosphere as infrared radiation (IR).