. Smithsonian miscellaneous collections. aweek or more previously. The effects are long continuing. Theyappear to begin 3 days before measurable changes in radiation occur,and to last at least until 14 days after, making an important sequenceof at least 17 days in weather, attending each change of solar radiation. The question arises whether solar observations may be utilized forweather prediction. Obviously it would be necessary to have all thedates when solar changes occur, for the effects are so large that touse some and omit others would lead to great error. Furthermore theexact dates are
. Smithsonian miscellaneous collections. aweek or more previously. The effects are long continuing. Theyappear to begin 3 days before measurable changes in radiation occur,and to last at least until 14 days after, making an important sequenceof at least 17 days in weather, attending each change of solar radiation. The question arises whether solar observations may be utilized forweather prediction. Obviously it would be necessary to have all thedates when solar changes occur, for the effects are so large that touse some and omit others would lead to great error. Furthermore theexact dates are necessary. For the effects change rapidly from dayto day. In order to test the prospects with the present available data, Ihave attempted a solar weather forecast for the temperature at Wash-ington covering the interval January 1 to May 28, 1943, and havecompared it with the event. For illustration I present the solar expec-tation for the interval February 1 to March 14 in the accompanying SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. IO4. 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
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