Abstract
IN this monograph, Dr. Ch. Maurain, the director of l'Institut de Physique du Globe, covers chiefly from an observational point of view the important study of radiation, solar, atmospheric and terrestrial. Certain phenomena associated with the ionosphere indicate that the sun's ultra-violet radiation varies in sympathy with the eleven-year sunspot cycle; yet the reality of a related periodic variation of the integrated radiation (the ‘solar constant’) as received at the earth's surface is extremely difficult to demonstrate in spite of years of observation linked with the name of C. G. Abbot (see NATUBE of April 29, p. 705). Passing from the determination of the solar constant, there is the allied study of the incoming solar radiation as it passes earthwards through the atmosphere: the long-wave radiation from atmosphere and earth, and the distribution of these various factors in the energy balance sheet, which Dines first showed meteorologists how to prepare.
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