What does Ionosphere mean in Astronomy Dictionary?

  • the region of Earth's upper atmosphere containing half the normal commission of free electrons and ions produced by photoionization of this constituents associated with atmosphere by solar power ultraviolet radiation. The ionosphere dramatically affects radiowave propagation of frequencies lower than about 30 MHz. In Earth's atmosphere, the ionosphere starts at an altitude around 25 miles and stretches outward about 250. by Pearlie ParnellReport definition

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