What is F-LAYER?

Upper ionized layer in the ionosphere resulting from ultraviolet radiation from the Sun and capable of reflecting radio waves back to Earth at frequencies up to 50 MHz. At a regular height of 300 km during the night, it falls to about 200 km during the day. During some seasons, this remains as the Fi layer while an extra F2 layer rises to a maximum of 400 km at noon. Considerable variations are possible during particle bombardment from the Sun, the layer rising to great heights or vanishing. Also Appleton layer.

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