Smithsonian miscellaneous collections . ember 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 sunsp
Smithsonian miscellaneous collections . ember 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-spheric character hxF2 and based on January 1940. These are solar-constant periods. It seemed desirable to remove from the periodicities. Fig. 14B—Submultiples of 22f years found as periods in this ionospheric quantity h1F2. Periods in months. Table 3.—Characteristics of periodicities of tfF2 Periods 4? 5* 6-1/15 7 8J 9-1/10 Amplitudes 3-7 J-7 3-5 No. of columns 23 19 16 14 12 11 Periods 9! 10-1/10 10-6/10 ni 13-1/10 155: Amplitudes 5-3 3-5 5-3 4-7 No. of columns 10 9 9 986 of iij and 13-1/10 months superriding periodicities of n|-=-2,13-1/10-4-2, and 13-1/10-7-3 months. In these cases the original re-sults are shown dotted, the results cleared of superriders are shownheavy and full. Table 3 gives the characteristics of these curves offigure 14B. The periods are in months, the amplitudes in percentagesof 314. 24 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 122 As regards the comparative phases of the periodicities in the solarradiation and in the hxF2 data, we should expect them to agree. For,as figure 14A shows, the higher radiation of summer months bringsh
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