. Smithsonian miscellaneous collections. ly separated tropical stations. Table 5.—-Average deviation from normal of pressure at tropical stationsfor each year of the sunspot period, in millibars Quixeramobim, Brazil, Zanzibar, East Africa, .0 Colombo? Ceylon, +.2 Mean +.3 Mean of three Years before-3 -2 -1 Yearsafter + 1 +2 +.6 --S .0 -•3 --3 --2 +.2 +. —.0 —.1 +.2 +. +.2 Years before Yearsafter -3 -2 -1 0 + 1 +2 +.7 +.3 +.2 +.3 -o +.1 +. +.1 +. +.3 +-3+.1 +.2 +.2 . +.1+.2 .0 +. +.4 !+.i +.2+.1 ...
. Smithsonian miscellaneous collections. ly separated tropical stations. Table 5.—-Average deviation from normal of pressure at tropical stationsfor each year of the sunspot period, in millibars Quixeramobim, Brazil, Zanzibar, East Africa, .0 Colombo? Ceylon, +.2 Mean +.3 Mean of three Years before-3 -2 -1 Yearsafter + 1 +2 +.6 --S .0 -•3 --3 --2 +.2 +. —.0 —.1 +.2 +. +.2 Years before Yearsafter -3 -2 -1 0 + 1 +2 +.7 +.3 +.2 +.3 -o +.1 +. +.1 +. +.3 +-3+.1 +.2 +.2 . +.1+.2 .0 +. +.4 !+.i +.2+.1 ... The 3-year means of the three stations is plotted in figure 18. This arrangement of the data shows that the maximum effect of thesunspots comes 1 year earlier than the maximum number of that time spots are increasing rapidly, so that rate of increase in NO. 19 SUNSPOT CHANGES AND WEATHER CHANGES CLAYTON 23 Spot Spot Years Max. Years after before aft •3-2-1 0 1 2 -3 -2-1 0 1 mo+ .3 I I I I I I I I I I I. Fig. 18.—Pressure changes at tropical stations during sunspot period of 11years. A, smoothed values of yearly means; B, unsmoothed means for Marchand September. spots is one of the factors in determining the effect. The persistencyof this influence on the pressure throughout the year is shown intable 6. Table 6.—Mean differences in millibars between the pressure near maximum andminimum sunspots {Max. minus Min.) for each month of the year, from the meansof three tropical stations (Quixeramobim, Zanzibar, and Colombo) for each yearof the sunspot period before spots Yearsafter January + +.6 -3 +.4 April. May June Mar. * Minima. + .2 + .4 --S I 0+1+2 6 +.1 4* -6* -9* 5* +4 - .8* - * +-i 43 o o 3 +-6 7* +-4 +-7 --I +-i July .September October +.1 November. . .o - December. . — .i — before spots—3 -2 —i o + •3 --S --S* - + .2 +.1 -+ .2
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