According to Watson-Watt, the man who discovered this engaged in earlier work that was crucial to victory at the Battle of Britain. It was first located by experiments using the BBC's Bournemouth transmitter. Because short waves are reflected by it, it is essential to the propagation of high frequency radio waves, as the regions below it break up at night. Its reflection properties are affected by sunspots, and it lies between 150 and 400 kilometers above the similar Kennelly-Heaviside Layer. Al
According to Watson-Watt, the man who discovered this engaged in earlier work that was crucial to victory at the Battle of Britain. It was first located by experiments using the BBC's Bournemouth transmitter. Because short waves are reflected by it, it is essential to the propagation of high frequency radio waves, as the regions below it break up at night. Its reflection properties are affected by sunspots, and it lies between 150 and 400 kilometers above the similar Kennelly-Heaviside Layer. Also called the F Layer, FTP, identify this region of the atmosphere, the uppermost part of the ionosphere named for its British discoverer.
According to Watson-Watt, the man who discovered this engaged in earlier work that was crucial to victory at the Battle of Britain.
{Appleton} Layer (accept {F} layer before it is mentioned)