266 PR- C. CHRKK: SOME PHENOMENA OF SUNSPOTS 



months, a high value in the maximum for the subsequent pulse is in considerable 

 measure accidental, but even if accepted as a physical fact, it might have more than 

 one interpretation. 



When we took from amongst the selected disturbed days those whose " character " 

 figure exceeded 1'5, the amplitude of the associated pulse was decidedly larger than 

 that associated with the full choice of 5 days a month. Consequently, the amplitude 

 of the subsequent pulse increases with that of the primary pulse. Thus a large 

 maximum in columns 3 to 8, or 9 to 14, of Table VIII. is naturally regarded as due 

 at least in part to a large corresponding value in columns 1 or 2. But it might also 

 arise from a greater potency of the 27-day period at one season of the year than 

 another, or simply from a large average amount of disturbance during the month in 

 which the subsequent pulse falls. If the principal cause of a large amplitude in the 

 subsequent pulse is large amplitude in the primary, then, apart from accident, one 

 would expect only minor variations in the ratios of these two quantities given in the 

 three last columns of Table VIII. If, on the other hand, the 27-day period is 

 markedly more potent at one season than another, one would expect the values of 

 the ratio to show a marked annual variation, and this to be at least approximately 

 the same in columns 15 and 16. 



In column 15 the highest value exceeds the lowest by 0'28, or 44 per cent, of the 

 mean value 0'64. In column 16 the corresponding excess is 40 per cent, of the mean 

 value. Thus the fluctuations are considerable. But the variations, especially in 

 column 16, do not suggest any regular law, and they do not follow a parallel course 

 in the two columns. 



It will be found that there is a distinct tendency for the figure in column 16 to be 

 high or low, according as the corresponding figure in column 2 is less or greater than 

 the figure for the immediately subsequent month. In January and July, for instance, 

 the ratio given in column 16 is very high, while the January and July figures in 

 column 2 are considerably less than those for February and August. The same 

 phenomenon may be traced in columns 15 and 1. 



To see the extent to which this phenomenon prevails, the values were calculated of 

 the ratio borne by the maximum figure in any month in columns 3 to 8 to the figure 

 assigned to the next subsequent month in column 1, and the same calculation was 

 repeated for the 6-year period. The twelve monthly ratios thus obtained for the 

 11-year period had the same mean value 0'64 as the ratios in column 15, but they 

 ranged only from 075 in September to 0'55 in May. Their average departure, 

 irrespective of sign, from their arithmetic mean was only 0'040, as compared with 

 0'053 for the ratios in column 15. In the case of the 6-year period, the corresponding 

 figures were respectively 0'054 and 0'076. 



'he days which are from 25 to 30 days subsequent to a given selected disturbed 

 day fall, in the majority of instances, in the subsequent month. Thus the natural 

 inference from the previous figures is that the amplitude of the first subsequent pulse 



