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{{#category_index:I|ionosphere}} (īon’ ∂ sf∂r,) That part of the Earth’s atmosphere that includes several layers of ionized gas at a height of 50 to 1000 km, which bends certain radiowaves back toward the Earth because of dispersion. It is divided into several layers according to the types and concentrations of ions. See Figure A-22, D-layer, E-layer, F-layer, and refraction correction.