A STUDY OF REFRACTION IN THE LOWER ATMOSPHERE

ISSN： 1752-2706

Source： Survey Review, Vol.16, Iss.121, 1961-07, pp. : 107-119

Disclaimer: Any content in publications that violate the sovereignty, the constitution or regulations of the PRC is not accepted or approved by CNPIEC.

Previous Menu Next

Abstract

Since the number of variables which can affect refraction, directly or indirectly, is large, it was decided to bring about simplification by choosing flat, level sites with even surface conditions. This ensured that the effect of topography, aspect and surface conditions was constant along the length of the line. (However, topography beyond the level site could still have a variable effect.) The dependence of refraction on height above ground was to be measured firstly by observing more than one target, at different heights in the same vertical plane, and secondly by varying the height of the observing instrument. The effect of all the factors· determining the temperature of the surface was to be measured by taking the temperature of the surface, and measuring the intensity of radiation reaching the surface.