NO. 7 THK ATMOSPHERE AND THE SUN CLAYTON IJ 



This chart is derived from the annual period in pressure as com- 

 puted from the data hy harmonic analysis. The areas outlined on 

 the chart show where the maximum increase of pressure occurs 

 at different seasons when solar activity is greater than normal. In 

 mid-winter the excess of pressure is greatest over the continents 

 in high latitudes. There is a defect in the same regions in summer. 



Fig. II. — Regions in which highest pressure occurs at different seasons 

 with increased solar activity. Annual period. 



In spring the greatest excess occurs over the North Atlantic and 

 North Pacific, and there is a defect in autumn. In autumn there is 

 an excess in middle latitudes and a defect in spring. 



The results both for the semi-annual period and for the annual 

 period were checked by an analysis of the data during periods of 

 low^ solar radiation which give in general the opposite effect. 



The shifting in position of maximum effect on the atmosphere in 

 the annual ])ericxl is clearly related to surface conditions and may be 



