-I-,- 



I.j; c. C'HK'KE: SOMF I'llKM 'MKNA OF SUNSPOTS 



N-iiiU in one case 14. The pulse in the H range curve owed its crest at day n + 4 

 almost rntirely to the frequency of days of " character " ' 1." The columns containing 

 most "2's" were n 12 with 94, n 11 with 96, and n 10 with 94. The concentra- 

 tion of 2's in these columns proved to be the chief, if not the sole, cause of a subsidiary 

 pulse in the H range curve, to which there was no corresponding feature in the 

 sunspot curve. 



H range data were not available for 1906 to 1910, so no further comparison of tlu-m 

 with sunspots was possible. But a comparison was made between sunspots and 

 international " character " figures, taking the same fundamental days as in the 

 previous part of this paper. In the present case, then, the basis of selection was the 

 "character" figure, whereas in S.M. it was the sunspot area. The research was limited 

 to the 5 years 1906 to 1910, as Greenwich spot areas for 1911 were not published at 

 the time. There were thus 5x12x5, i.e., 300, representative days n. Spot areas 

 were entered in 32 columns, n 20 to w+11, and the columns were summed. The 



TABLE IX. Projected Sunspot Areas on Days of Largest International " Character " 

 and on Previous and Subsequent Days, as Percentages of the Mean Area for 

 the Five Years 1906 to 1910. 



mean projected areas for the years 1906 to 1910 were in order 1047, 1453, 952, 941 



157, the unit being the one-millionth of the sun's apparent disc. Thus the total 



average days, 60 from each year, comes to 285,000. The figures 



appearing in Table IX^epresent percentages of this number. The three last selected 



52, 28 and 29, 1910; thus two days in each of the columns 



