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Why sky wave propagation is not possible...

Why sky wave propagation is not possible for wave having frequency more than 30 MHz ?

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Ionospheric reflection of radio waves, back towards the earth, is known as sky wave communication.
The ionospheric layers act as a reflector for a certian range of frequencies (3-30 MHz). Electromagnetic waves of frequencies higher than 30 MHz (or few upto 40 MHz) penetrate the ionosphere and escape.
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