Explain space wave propagation of radio waves.

Explanation

Space communication : It is communication process which utilizes the physical space as communication medium.
In space communication, a signal is emitted from the antenna of a transmitter and received by another antenna at the receiver. This can be done in two ways. The wave can travel directly following the surface of earth, known as surface wave (ground wave), or can reach being reflected by the ionosphere, known as the sky wave.
In surface wave propagation the reception is possible only when the receiver antenna directly intercepts the signal. This mode of communication is used for medium wave band and for television broadcasting .
In sky wave propagation, the carrier wave is reflected from different layers of the ionosphere.