Caused by ultraviolet radiation from the sun, it deflects radio waves of less than 50 megahertz back towards earth.
Also known as the F-layer, it sits about 200 kilometers above the earth's surface at noon but rises to 300 kilometers at night. Caused by ultraviolet radiation from the sun, it deflects radio waves of less than 50 megahertz back towards earth. FTP, name this region of highly ionized particles that makes radio transmission possible.
Also known as the F-layer, it sits about 200 kilometers above the earth's surface at noon but rises to 300 kilometers at night.
the {Appleton} layer