Some of the equations developed for the estimation of solar radiation are discussed and a set is developed for Australia based on the network of Robitzsch actinometers. Using all data the regression equation Q/QA = 0.26 + 0.50 n/N is obtained and this is applied to Australian sunshine and cloudiness observations to form the basis for maps showing the January and July radiation. Out-going radiation is estimated by the Brunt type equation and net radiation is obtained assuming a universal albedo of 0.23. The chief feature of the distribution of net radiation in January is the relatively small variation across the Continent. Monthly means of the absorption coefficient are calculated, using Beer's Law, for selected radiation stations.
C. E. Hounam (Sun,) studied this question.
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