. Smithsonian miscellaneous collections. Fig. 9.—Departure from normal pressure by months with high solar activity. months when solar activity was high and for the months when solaractivity was low as given in table 2. The results for the 6-monthperiod when solar activity was high at the epochs April and Octoberare shown in figure 10 plotted on a map of the northern hemisphere. l6 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 82 It is seen from this map that the latitude effect as pictured in figure 7is increased twice a year when the sun crosses the Equator in Marchand October. At that time the
. Smithsonian miscellaneous collections. Fig. 9.—Departure from normal pressure by months with high solar activity. months when solar activity was high and for the months when solaractivity was low as given in table 2. The results for the 6-monthperiod when solar activity was high at the epochs April and Octoberare shown in figure 10 plotted on a map of the northern hemisphere. l6 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 82 It is seen from this map that the latitude effect as pictured in figure 7is increased twice a year when the sun crosses the Equator in Marchand October. At that time the effect of high solar activity on thepressure is accentuated. The decreased pressure at the Equator, theincreased pressure in middle latitudes and the decreased pressure atthe poles are greater than at other times of the Fig. 10.—Excess or defect of pressure at the Equinoxes (March andSeptember) with increased solar activity. On the other hand, when the sun is at the solstices in June andDecember the latitude differences are diminished and eftects due tocontrasts between land and water are accentuated. The greatestincrease of pressure with increased solar activity is over the con-tinents in winter and over the oceans in stimmer. This is an annualchange in contrast to the semi-annual period in latitude effects. Theannual effect is shown in figure ii. NO. 7 THE ATMOSlIIERE AND THE SUN CLAYTON This chart is derived from the annual period in pressure as com-puted from the data by harmonic analysis. The areas outlined onthe chart show where the maximum increase of pressure occursat different seasons when solar activity is greater than normal. Inmid-winter the excess of pressure is greatest over the continentsin high latitudes. There is a defect in the same regions in summer.
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