Smithsonian miscellaneous collections . C, wehave curve D. There now appears a period of 45^-^5 months. Re-moving it we have curve E. It discovers a period of 45^-^7 it, we have curve F. Curve F contains a period of 45^ -4-13or 3^ months, but I do not remove it. For it is now easy to draw thesmooth curve G, which is the real curve of the 45^-month period. As will be seen, the researcher has no option. Once started hemust follow this path. The periods discovered in solar variation by no. 4 SOLAR VARIATION, WEATHER ELEMENT—ABBOT 21 figure 14 are i, 1/12, 1/18, 1/24, 1/30, 1/42, a
Smithsonian miscellaneous collections . C, wehave curve D. There now appears a period of 45^-^5 months. Re-moving it we have curve E. It discovers a period of 45^-^7 it, we have curve F. Curve F contains a period of 45^ -4-13or 3^ months, but I do not remove it. For it is now easy to draw thesmooth curve G, which is the real curve of the 45^-month period. As will be seen, the researcher has no option. Once started hemust follow this path. The periods discovered in solar variation by no. 4 SOLAR VARIATION, WEATHER ELEMENT—ABBOT 21 figure 14 are i, 1/12, 1/18, 1/24, 1/30, 1/42, and 1/78 of 22| years. c. I again invite attention to figure 8, which shows that periods ob-served in solar-constant variation of 6-1/30, 9-7/10, 11^, and 33-1/10months also occur in the ionospheric data on Fe given in table 1. There is another aspect of this matter of Fe which adds to its evi-dential quality. From solar-constant measures, as set forth in the papercited above as No. 27, the times of maxima and minima for solar radia-. Fig. 14.—The 45^-month period in solar variation. tion in the year 1938 are as follows (December, when given, is Decem-ber 1937) : Period 6-1/30 Maxima January Minima March From figure 8, here, the times of maxima and minima for Fe in theyear 1938 are as follows: 9-7/10 ni 13-1/10 December-January September March April-June March June-July Period 6-1/30 9-7/10 Maxima March April Minima December December 11? 10-1/10 January-April August August-September March 22 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 122 Thus we find, to within the error of determinations, that for allfour subperiods maxima in radiation are simultaneous with minima inFe, and vice versa. This is, of course, exactly the relationship whichwe should expect, if the supposed periodicities are real. I have additional evidences of correlation of solar periods and iono-spheric observations. From the publication of the National Bureau ofStandards entitled Ionospheric Data, I have tabu
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