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Publisher-reported update

2017-01-26

The plate contains four maps: (1) map of the global solar radiation network and sunshine recorder network; (2) annual global solar radiation; (3) June cloudless day radiation; and (4) mean annual net radiation. Stations recorded data to the end of 1970. Solar and net radiation are measured from a network of over 50 stations and supplementary information is also provided by over 200 sunshine recorder stations. Regular network data is published in a "Monthly Radiation Summary", which started in 1952 with daily totals, then added hourly totals in 1960. The Canadian radiation network has been rather unevenly distributed spatially to allow good quantitative estimates to be made for all locations. Fortunately, however, there is an excellent correlation between monthly means of the duration of sunshine and monthly means of global solar radiation. The sunshine network is more extensive so that interpolated values can be obtained except where the density is low, as for example, in the North.

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