Propagation mode
Propagation mode (1) in radio communication, refers to the manner in which radio signals propagate from the transmitting antenna to the receiving antenna. Radio waves can be reflected from the ionized layers within the ionosphere. Scatter modes of propagation also exist, and in these modes, propagation from the transmitting to receiving antennas is largely the result of scattering of the radio waves by dust and other particles in the troposphere. The ionized trails of meteors can also act as scatterers.
Source: http://ee.sharif.edu/~lcsl/useful/Electrical%20Engineering%20Dictionary.pdf
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Author of the text: Ed. P.A. Laplante Boca Raton: CRC Press LLC, 2000
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