subrefraction

subrefraction

[¦səb·ri′frak·shən]
(electromagnetism)
Atmospheric refraction which is less than standard refraction.

subrefraction

A condition in which there is less than normal bending of a radar beam. This may be as a result of an abnormal vertical gradient of temperature and/or water vapor.
References in periodicals archive ?
Various propagation conditions can be defined by the vertical gradients of M, resulting in three anomalous propagation (AP) conditions: subrefraction, superrefraction, and ducting.
"Subrefraction" occurs when air temperature decreases or humidity increases rapidly with height, causing EM waves to bend upward or away from the earths surface.
The radio refractive environment can be classified into standard, subrefraction, superrefraction, and ducting environments.