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IEVref:705-05-15ID:
Language:enStatus: Standard
Term: standard refractivity gradient
Synonym1: standard - N gradient
[Preferred]
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Definition: a standard value of vertical gradient of refractivity namely - 40 N-units per kilometre

NOTE – This value corresponds approximately to the median value of the gradient in the first kilometre of altitude in temperate regions.


Publication date:1995-09
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