File:Smithsonian miscellaneous collections (1947) (14765135124).jpg

Identifier: smithsonianmisce1041947smit (find matches)
Title: Smithsonian miscellaneous collections
Year: 1862 (1860s)
Authors: Smithsonian Institution
Subjects: Science
Publisher: Washington : Smithsonian Institution
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Smithsonian Libraries

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4sh 39i 34, 3°i 2^, 21, 11.87, 11.29, 979, 8iInasmuch as the interval during which solar-constant measurementshad been continuously pursued was then less than 20 years, it cannotbe claimed that these periods, especially the longer ones, are very accu-rate. But from our best knowledge of them they seem approximately,though not exactly, to be all submultiples of 273 months, as indicatedin table 31 of volume 6, just cited. This master period of nearly 23years, derived from Smithsonian researches on the solar constant ofradiation, is approximately equal to two sunspot cycles of ii-j years.The areas included under successive sunspot-cycle curves since theyear 1811 are alternately smaller and larger, as appears from figure 10of my paper Solar Radiation and Weather Studies, 5 so that thedouble cycle is a periodicity in sunspots also. Furthermore, Halediscovered it in the variation of magnetic polarities in sunspots. It 5 Smithsonian Misc. Coll., vol. 94, No. 10, 1935. See also figure 26 B.
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24 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. IO4 has also been noted by many observers in weather, in tree rings, andin other terrestrial phenomena. The double and quadruple of the273-month period, that is 45^ and 91 years, are strongly marked, much ¥ £ --r^ (O ::., 8 -\7; .:,. n —-. _-::: (0 -\. -- m ;=: ■L. .... .. 0 ~: =• — ::-.. (0 J* - ,. «i ** - ~.v -. 0 ^ j: 2 ... - s. M ^ « ? Si ----- 1. 5»- CM .;; ;. CM _ .v.. a - SK CM - W ■■ r— — i O R 0 —ifi=« l^ -+- f 1 ( 0 4 D 0 ( J urt C.2« bo X! M •5 I- c« > u <u ,„• h ai 2 ^ o-g « O < S more so than the 273-month period itself, in records of the levels ofthe Great Lakes.6 8. LONG-RANGE SOLAR VARIATION PREDICTED AND VERIFIED We now have preliminary monthly mean solar-constant values derived from observations at Montezuma, Chile, our best station, 6 Loc. cit. NO. 5 WEATHER AND SOLAR VARIATION—ABBOT 25 covering the interval from 19

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