NO. 15 



WEATHER AND SOLAR ACTIVITY CLAYTON 



radiation increased. For this reason the two lower plots of pressure 

 departures from normal are inverted in figure 13. The correlation 

 values vary between 0.60 and 0.70 for the 30 months covered by 



Cal. mn 

 f.OlO +3.0 



■000 0.0 



-.010 -3.0 



April May June 



1921 23 25 27 29 1921 23 26 27 29 1921 23 26 27 29 



February 

 23 25 27 29 



I I I I I - f I r I 

 Pacific Ooean 20 



A-./-\. 



1 I I I I I I I I I 



TV 



Sol€u- Radiation 



1 I I M I I I I I 



July August September 



1921 23 25 27 20 19 21 23 Zb Zl 29 1921 23 25 27 29 

 I I I I I 



Fig. 13. — Monthly mean departures of solar radiation and of atmospheric pressure 

 from lO-year normals (i). 



each plot. The variations of atmospheric pressure are much larger 

 in high latitudes than near the Equator. For that reason the variation 

 of pressure for a given change in solar radiation is much greater in 



