Smithsonian miscellaneous collections . \ 1 / \ r V OBSERVED \ \ \ A \ \ r- \J \ \\ j \ ^\ /\ \ \ I / ^ \ / / \ \ 17 \\ / J I, \J \ 1932 1933 1934 1935 Fig. 8.—Predicted and observed solar variation. The maxima and minimaoccur in the two curves at nearly identical phases. The observed curve may befaulty in 1932 owing to the Chilean volcanic eruption. The separation of thecurves toward the end is due to a 23-year periodicity not taken account of. calories, or percent. As explained in caption 26, onpage 86, there may possibly be a change of phase in solar variationabout 1934, tending
Smithsonian miscellaneous collections . \ 1 / \ r V OBSERVED \ \ \ A \ \ r- \J \ \\ j \ ^\ /\ \ \ I / ^ \ / / \ \ 17 \\ / J I, \J \ 1932 1933 1934 1935 Fig. 8.—Predicted and observed solar variation. The maxima and minimaoccur in the two curves at nearly identical phases. The observed curve may befaulty in 1932 owing to the Chilean volcanic eruption. The separation of thecurves toward the end is due to a 23-year periodicity not taken account of. calories, or percent. As explained in caption 26, onpage 86, there may possibly be a change of phase in solar variationabout 1934, tending to modify the 3-year forecast given in figure 7. II. WEATHER RESPONSIVE TO PERIODIC SOLAR CHANGES8. Sun-Spot Influence Having strong indications of 12 long-continued periodic fluctua-tions in solar radiation, statistical studies were made to seek for theireffects on temperature and precipitation. First taking the departures i6 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 94. Fig. 9.—Sun-spot numbers and phase changes. The ii-month periodicity intemperature departures at Bismarck, N. Dak. NO. 10 SOLAR RADIATION AND WEATHER STUDIES ABBOT 17 from normal temperature at Bismarck, N. Dak., from 1875 to 1925as computed from World Weather Records, computations similarto those illustrated in connection with table 3 were made. It was soonfound that evidences of terrestrial counterparts of each of the sevensolar periodicities then known were apparent for short intervals, butchanges of phase occurred, showing that continuity is lacking. Furtherstudies seemed to show that these puzzling changes of phase wereabsent if the computations were restricted to intervals when the sun-spot activity as measured by Wolfs numbers is nearly constant. Later,when longer series of weather records were studied, another phaserelationship of much more importance was disclosed. But of this weshall write later. Figure 9 shows the results of analyses of Bismarck temperaturesaimed to discl
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