. Smithsonian miscellaneous collections. Fic. 20.— period in solar radiation and pressure. NO. 7 THE ATMOSPHERE AND THE SUN CLAYTON 31 Figure 21 shows the observed values of solar radiation duringDecember, 1923, and January and February, 1924, These values arecompared with the observed values of pressure at Spitzbergen andat Haml)urg. A 24-day period of oscillation is evident in each caseand this oscillation is shown by the dotted curves computed fromthe data in each case by harmonic analysis. Pressure data from all. Fig. 21.^24-day period in solar radiation and pressure. over the nort
. Smithsonian miscellaneous collections. Fic. 20.— period in solar radiation and pressure. NO. 7 THE ATMOSPHERE AND THE SUN CLAYTON 31 Figure 21 shows the observed values of solar radiation duringDecember, 1923, and January and February, 1924, These values arecompared with the observed values of pressure at Spitzbergen andat Haml)urg. A 24-day period of oscillation is evident in each caseand this oscillation is shown by the dotted curves computed fromthe data in each case by harmonic analysis. Pressure data from all. Fig. 21.^24-day period in solar radiation and pressure. over the northern hemisphere were treated in this way for a periodof 24 days by Dr. Weickmann and showed a systematic wavemovement from the polar basin southward. For the study of long periods, no values of solar radiation are avail-able; but the period shows a distinct relation to sun-spotchanges. Figure 22 shows a plot of consecutive means of threeperiods of years. This period is one-third of Hales sun-spotperiod of years, and the mean of the three periods eliminatesthe sun-spot period which is one-half of Hales period. 32 SMITHSONIAN MISCELLANEOUS COLLECTIONS 82 Pressure curves are plotted for five widely separated stations. Theseplots show distinctly an oscillation in the atmosphere of the length years and a progress southward from high latitudes. 1860 1870 1880 1890 1900 1910 1920
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