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单词 Atmospheric duct
释义

Atmospheric duct

英语百科

Atmospheric duct

Fata Morgana of Farallon Islands with clearly seen duct

In telecommunication, an atmospheric duct is a horizontal layer in the lower atmosphere in which the vertical refractive index gradients are such that radio signals (and light rays) are guided or ducted, tend to follow the curvature of the Earth, and experience less attenuation in the ducts than they would if the ducts were not present. The duct acts as an atmospheric dielectric waveguide and limits the spread of the wavefront to only the horizontal dimension.

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