. Smithsonian miscellaneous collections. Fig. 4.—Mean march for 25 days of rainfall at Washington in February,years 1924 to 1938, as associated with ups and downs of the solar constant ofradiation, years 1938 to 1944, as associated with ups and downs of criticalfrequencies of ionization for the layer Fe. Solar change on zero day. NO. 13 SOLAR VARIATION AND WASHINGTON WEATHER ABBOT. S:S 5 33^££££ ~ ^t^^^Scs*^ «N v-* ei CH. c^t «i <^ Fig. 5.—Predicted and observed departures from normal temperature atWashington February 1 to March 14, 1943. Prediction synthesized from indi-vidual effects of a
. Smithsonian miscellaneous collections. Fig. 4.—Mean march for 25 days of rainfall at Washington in February,years 1924 to 1938, as associated with ups and downs of the solar constant ofradiation, years 1938 to 1944, as associated with ups and downs of criticalfrequencies of ionization for the layer Fe. Solar change on zero day. NO. 13 SOLAR VARIATION AND WASHINGTON WEATHER ABBOT. S:S 5 33^££££ ~ ^t^^^Scs*^ «N v-* ei CH. c^t «i <^ Fig. 5.—Predicted and observed departures from normal temperature atWashington February 1 to March 14, 1943. Prediction synthesized from indi-vidual effects of all observed ups and downs of solar activity affecting thatinterval of time. 8 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. IO4 illustration. The method of computing it is simple. From the recordsof Fe ionization data, one takes all the dates when ups and downs ofsolar radiation occur. Opposite each one of these dates he writes ina column of 20 days the departures from normal temperature appro-priate to the observed solar change. He then adds the columnsalgebraically to give in sequence the combined temperature effect ofall the solar changes. This procedure is clearly shown in figure 5. In the illustration I show in dotted lines the departures from normaltemperature due to integrated solar effects, and in full lines the actualevent. It will be seen that the two curves
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