Solar radiation Langley 1903
1911 article "Sun", figure 12. From Astrophysical Journal, xvii, 2 (University of Chicago Press).
"The resulting allowances and conclusions are shown in fig. 12, taken from an article by Langley in the Astrophysical Journal (1903), xvii, 2. The integrated emission of energy is given by the area of the outer smoothed curve (4), and the conclusion from this one bolograph is that the "solar constant" is 2.54 calories. The meaning of this statement is that, arguing away the earth's atmosphere, which wastes about one-half what is received, a square cenimetre, exposed perpendicularly to the sun's rays, would receive sufficient energy per minute to raise 2.54 grams of water 1° C. Langley's general determination of the constant was greater than this - 3.0 to 3.5 calories; more recently C. G. Abbot at Mount Wilson, with instruments and methods in which Langley's experience is embodies, has reduced it greatly, having proved that one of Langley's corrections was erroneously applied. The results vary between 1.89 and 2.22, and the variation appears to be solar, not terrestrial. Taking the value at 2.1 the earth is therefore receiving energy at the rate of 1.47 kilowatts per square metre, or 1.70 horse-power per square yard."
(The above incorporates text from a publication now in the public domain: Chisholm, Hugh, ed (1911). "Sun". Encyclopædia Britannica (Eleventh ed.). Cambridge University Press.)Więcej informacji o licencji można znaleźć tutaj. Ostatnia aktualizacja: Wed, 21 Sep 2022 21:02:44 GMT