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Letters to Nature
Nature 239, 208 - 209 (22 September 1972); doi:10.1038/239208a0

Experimental Comparisons of the International Pyrheliometric Scale with the Absolute Radiation Scale

RICHARD C. WILLSON

Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California

THE definition of the absolute radiation scale with respect to fundamental physical concepts can be carried out by employing either a standard emitter or a standard detector of radiant flux. Standard emitters, frequently referred to as black-body sources, are chiefly employed in calibrating low level irradiance measurements. Standard detectors are more suitable for measuring the relatively high irradiance levels of solar flux.

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References

1. Kendall, J. M., and Berdahl, C. M., J. Appl. Optics, 9, 1082 (1970).
2. Willson, R. C., Tech. Rept. 32–1365 (JPL, Pasadena, 1969).
3. Willson, R. C., J. Geophys. Res., 76, 4325 (1971).
4. Willson, R. C., New Radiometric Techniques (NASA–Goddard, 1971).
5. Frohlich, C., Geist, J., Kendall, J., and Marchgraber, R. M., Third International Comparison of Pyrheliometers at Davos and Locarno 1970 (NASA–Goddard, 1971).
6. Angstrom, A., and Rhode, B., Tellus, 18, 25 (1966).
7. Labs, D., and Neckel, H., Solar Physics, 19, 3 (1971).



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