. Smithsonian miscellaneous collections. , and meteorological changes which are known by otherevidence to be related to solar conditions. The critics of solar variability have pointed out that the measuredvariations have decreased as the accuracy of the observations in-creased and that in the earlier observations the eflfects of water vapor DAYS BEFORE 4 2 DAYS AFTER I \ f ;,4 t f t r f Y r ]\f of aun. Fig. I.—Calcium flocculi and solar radiation. The mean values of solarradiation received at the earth in calories per square centimeter per minute
. Smithsonian miscellaneous collections. , and meteorological changes which are known by otherevidence to be related to solar conditions. The critics of solar variability have pointed out that the measuredvariations have decreased as the accuracy of the observations in-creased and that in the earlier observations the eflfects of water vapor DAYS BEFORE 4 2 DAYS AFTER I \ f ;,4 t f t r f Y r ]\f of aun. Fig. I.—Calcium flocculi and solar radiation. The mean values of solarradiation received at the earth in calories per square centimeter per minute ondays before and days after the passage of calcium flocculi across the centralmeridian of the sun. 1918-1920. Flocculi of 400 or more on the Fbro scale ofvalues. in the air, of dust, of ozone, and of turbidity were not entirelyeliminated; but they have in no manner destroyed or impaired thesefundamental evidences of variability. Abbot and his associates have given evidence of the relation ofsolar radiation changes to solar contrast and to groups of spots onthe sun, Fowle has shown a relation to groups of flocculi, and I *have shown a relation to faculae. Bauer * has shown a relation to cer-tain changes in terrestrial magnetism, and Austin has found a Smithsonian Misc. Coll., Vol. 66, No. 5, 1916. Idem, Vol. 77, No. 5, 1925. Idem, Vol. 77, No. 6, p. 53, 1925. ^ Terr. Mag., Vol. 20, pp. 143-158, Dec, 1915. Smithsonian Misc. Coll., Vol. 80,
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