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Inversion (meteorology)
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===Radio waves=== {{main|Super refraction}} [[Very high frequency]] [[radio waves]] can be refracted by inversions, making it possible to hear [[FM radio]] or watch [[VHF low]]-band television broadcasts from long distances on [[fog]]gy nights. The signal, which would normally be [[refract]]ed up and away into space, is instead refracted down towards the earth by the temperature-inversion boundary layer. This phenomenon is called [[tropospheric ducting]]. Along coastlines during Autumn and Spring, due to multiple stations being simultaneously present because of reduced propagation losses, many FM radio stations are plagued by severe signal degradation disrupting reception. In higher frequencies such as [[microwave]]s, such refraction causes [[multipath propagation]] and [[fading]].
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