Smithsonian miscellaneous collections . f Fe in solar periods of 6-1/30, 9-7/10, 115 and13-1/10 months. b. I reproduce here as figure 10, figure 10 of my paper Solar Radi-ation and Weather Studies, reference No. 3 above. It will be foundthat alternate sunspot-cycle areas, i. e., the right-hand curves of figure10, are all greater in area included by the curves than the left-handareas. So the double of the usually termed n^-year cycle in sunspotfrequency is also a sunspot period. Note that a line through sunspotminima would incline to the left, as years increase, which shows thatperiod to be les
Smithsonian miscellaneous collections . f Fe in solar periods of 6-1/30, 9-7/10, 115 and13-1/10 months. b. I reproduce here as figure 10, figure 10 of my paper Solar Radi-ation and Weather Studies, reference No. 3 above. It will be foundthat alternate sunspot-cycle areas, i. e., the right-hand curves of figure10, are all greater in area included by the curves than the left-handareas. So the double of the usually termed n^-year cycle in sunspotfrequency is also a sunspot period. Note that a line through sunspotminima would incline to the left, as years increase, which shows thatperiod to be less than 23 years. c. Dr. George E. Hale discovered over 40 years ago the reversal of 12 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 122 polarities of sunspots with alternate recurrences of the n^-year is, he discovered a period of about 22| years in sunspot mag-netism. d. I reproduce figure 30 from my paper just cited (No. 3 above) asfigure 11 here. It shows similar features in the march of tree-ring 280 Z60 •£ 240 ZZQ ZOO. I9M47 Fig. 9.—Comparison of solar constants 1924-1927 (heavy lines) and1947-1950 (light lines). widths in southern California for four successive cycles of 23 yearseach. These features stand out clearly in the mean curve at the bottomof figure II. e. I reproduce here as figure 12, figure 1 of my paper Some Peri-odicities in Solar Physics and Terrestrial Meteorology, referenceNo. 9 above. The figure traces 23-year cycles in the temperature ofSt. Petersburg, Russia, from 1752 to 1912, and also brings out thedouble period of 46 years. /. I reproduce here as figure 13, figure 22 of my paper Weather no. 4 SOLAR VARIATION, WEATHER ELEMENT—ABBOT 13
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