NO. 



THE ATMOSPIIERIi AND THE SUN CLAYTON 



no values of solar radiation were available, only sun-spot numbers 

 were used and an equivalent value of solar radiation was derived 

 from Abbot's ' plots of equivalent values and placed in parentheses. 



Since both sun-spot numbers and increased solar radiation are 

 considered in forming this table, the results derived from a compari- 

 son of the data in the table with meteorological conditions rest on 



Table 2.— Relative Sun-spot Numbers and Average Values of Solar Radiation 



Used in Study 



Low solar values 



High solar values 



Date Sun-spot 



summer number 



Apr. 1916 72 



" 1918 81 



May 1017 114 



" 1920 34 



June 1905 49 



1919 Ill 



July 1906 103 



" 1917 120 



Aug. 1917 154 



" 1918 102 



Sept. 1917 129 



" 1918 80 



Mean 95.7 



Winter 



Oct. I917 J2 



" I918 85 



Nov. 1917 96 



" 1919 42 



Dec. 1917 129 



1920 40 



Jan. 1918 96 



" 1920 59 



Feb. 1918 65 



" 1920 51 



Mar. 1917 93 



" 1920 ^2 



Mean 75.2 



Solar 

 radiation 

 (1.952) 



1-953 

 1.956 

 1-953 

 1.968 



1-955 

 1.962 

 1.989 

 1.956 

 1-954 

 1.948 

 1.944 

 1.958 



1-952 



1-939 

 (1-954) 

 (1-953) 

 (1-957) 



1-955 

 (1-954) 



L964 



(1-951) 

 1.956 



(1-954) 

 1-945 

 1-955 



Date 

 sunmier 



Apr. 1912. 



" 1913- 

 May 1910. 



" 1913- 



June 1909. 



1912. 



Sun-spot 

 niunber 



4 



I 



22 

 O 



- 23 



4 

 ■ 14 

 3 



- 23 

 II 



- 39 

 . 26 



July 1910.... 



1911 



Aug. 1909. . . . 



1910 



Sept. 1909. . . . 

 " 1910.... 

 Mean 8.3 



Winter 



Oct. 191 1 .... 



" 1913---- 

 Nov. 1911 . . . . 



" 1913---- 

 Dec. 1911 .... 



" 1913---- 



Jan. 

 Feb. 

 Mar, 

 Alean 



1911 . 



1913- 

 1912. 



1913- 

 1912. 



1913- 



Solar 

 radiation 

 ( 1-928) 



(1-925) 

 1. 916 



(1-923) 

 1.930 

 1.930 



1-913 

 I.917 

 1.926 

 I.912 

 1.908 



I-915 

 I.917 



1-915 



1.866 



1-903 



1.866 



(1.926) 



(1.928) 



(1.927) 



(1-925) 

 (1.923) 



(1-927) 

 (1.929) 



(1-923) 

 1-913 



_\'alues in parentheses are derived from sun-spot data and are taken from Alibot's curve 

 ot equivalent values, Smithsonian Misc. Coll., Vol. 80, No. 2. 



increasM solar activity, whether measured by sun spots, faculae and 

 flocculi. or by an increase in solar radiation reaching the earth. 

 Solar radiation values are missing for a number of the spring and 

 winter months because no observations were made during these 

 months in the earlier years. These months are included because it 



' A group of solar changes, Smithsonian, Misc. Coll., Vol. 80, No. 2, p. 8, 1927. 



