Smithsonian miscellaneous collections . iation. 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 i
Smithsonian miscellaneous collections . iation. 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 tabulated the meanmonthly values of the quantity haF2 for the hours n, 12, and 13, from. March May July Sept. Nov. Fig. 14A.—The yearly march in the ionospheric quantity hF2. September 1944 to December 1952. Taking the general mean of these101 mean monthly values of hxF2 for the hour of noon, it comes out314. I computed the departures from this mean value, and arrangedthem by months. Taking the means of these monthly departures over8+ years, they are as represented in figure 14A. I then removed thisaverage annual march from the departures. Next, the corrected de-partures were plotted against the appropriate sunspot monthly Wolfnumbers. The resulting graph (not shown here) was well representedas a straight line, yielding the sunspot correction (Wolf No.— 100). Applying this sunspot correction, I obtained the corrected no. 4 SOLAR VARIATION, WEATHER ELEMENT—ABBOT 23 departures of h1F2 to be compared to the subordinate periodicities insolar variation. In figure 14B I give graphs of 12 periodicities of the corrected iono-sphe
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