NO. 3 SOLAR RADIATION AND THE WEATHER — CLAYTON 3 



coefficients were computed for only four days following the solar 

 occurrences, and it was shown that a maximum positive correlation 

 occurred two to three days later in the tropics and the negative corre- 

 lation about three days later in the temperate zones. It is here seen 

 that the winter temperature in Buenos Aires conforms to this negative 

 correlation, but by extending the correlation to lo days an equally 

 great maximum correlation is found on the seventh to eighth day. 



Mean Temperatures at Buenos Aires Following Solar Radia- 

 tions OF Different Intensities 



To investigate the question further, the solar radiation values were 

 divided into classes differing by .020 calories, or about i per cent of 

 the mean. Thus, there are brought together in one group all the 

 values from 1.890 to 1.909, next, all those from 1.9 10 to 1.929, etc. 

 The temperatures in Buenos Aires were then tabulated for the same 

 day and for each succeeding day up to 19 days following. This was 

 done for the years 1913, 1914, 191 5, ai^d 1918, the solar values for 

 1 91 6 and 191 7 not then being available. The solar measurements 

 were all made in the summer half-year corresponding to the winter 

 half-year in the southern hemisphere. 



Table II gives the mean departures from normal temperature in 

 Buenos Aires following the different intensities of solar radiation. 

 The numbers represent tenths of a degree centigrade — thus 8 indi- 

 cates 0.8° C. 



Table II. — Deviations from Normal Temperature in Buenos Aires Following 

 Different Intensities of Solar Radiation (May to November) 



This table indicates very clearly different effects on the earth's 

 temperature following different values of solar radiation. Following 

 values of about 2.00 calories, the temperature of Buenos Aires reaches 

 a maximum about 10 days later and a second maximum about 17 



