VARIATION IN SOLAR RADIATION AND THE 

 WEATHER' 

 By H. helm CLAYTON 

 Introduction 



The following- research was carried out with the assistance of the 

 computing force of the Argentine Weather Service (Oficina Meteo- 

 rologica Argentina) and with the encouragement of the chief, 

 Prof. G. O. Wiggin, without which it would have been impossible. 

 I am also indebted to my associates, Mr. Angus Rankin and Mr. 

 William Hoxmark, for valuable assistance and especially for the 

 instrument invented by Mr. Rankin for determining angles and 

 amplitudes from the coefBcients of the harmonic formula, thus greatly 

 extending the reseaich by facilitating the work of computation. 



Correlation of the Temperature of Buenos Aires with Solar 

 Radiation of Different Intensities 



In the discussion of the efifect of short-period variations of solar 

 radiation on the earth's atmosphere (Smithsonian Misc. Coll., Vol. 

 68, No. 3, and Boletin Mensual, Oficina Meteorologica Argentina, 

 Junio 1916), it was found that the correlati'on between the tempera- 

 ture and the solar radiation was higher for central Argentina when 

 the temperatures were smoothed by means of 5, and it was also found 

 that the highest correlations followed certain very high values of solar 

 radiation. These differences in the results might be explained as 

 due to an uncertainty in the measurements of the absolute values of 

 the solar variations, or to the fact that there were differences between 

 the correlations of small and of large solar changes with the earth's 

 temperature. The process of smoothing tends to eliminate the 

 smaller oscillations. 



In order to test the question as to whether the correlation with the 

 temperature of Buenos Aires was dififerent for large and for small 



^ Published simultaneously in Spanish in the Boletin Mensual, Oficina 

 Meteorologica Argentina. 



Smithsonian Miscellaneous Collections, Vol. 71, No. 3 



