Kennelly-heaviside layer

The Kennelly-Heaviside layer is a layer of charged particles in the upper atmosphere that reflects radio waves, allowing long-distance radio communication. It was proposed in 1902 to explain how Marconi's messages were heard over such vast distances but not confirmed for twenty years.
 Arthur Edwin Kennelly and Oliver Heaviside United States and England 1902 Kennelly-heaviside layer

The Kennelly-Heaviside layer is a layer of charged particles in the upper atmosphere that reflects radio waves, allowing long-distance radio communication. It was proposed in 1902 to explain how Marconi's messages were heard over such vast distances but not confirmed for twenty years.