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JOURNAL OF GEOPHYSICAL RESEARCH,
VOL. 83, NO. C8,
PP. 4003-4007, 1978
doi:10.1029/JC083iC08p04003
Accurate Solar ‘Constant’ Determinations by Cavity Pyrheliometers
Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California 91103
Total solar irradiance was observed outside the earth's atmosphere by three types of absolute cavity pyrheliometer in a June 1976 sounding rocket experiment. The 1367 W/m2 average solar ‘constant’ result is uncertain by less than ±0.5%, the most accurate determination to date. Nearly simultaneous observations by the Nimbus 6 earth radiation budget total irradiance detector of 1389 W/m2 exceeded the rocket result by 1.6%. These recent results are discussed in the context of a summary of solar constant determinations made above the troposphere by cavity pyrheliometers.
Received 29 August 1977; accepted 8 February 1978; .
Citation: (1978), Accurate Solar ‘Constant’ Determinations by Cavity Pyrheliometers, J. Geophys. Res., 83(C8), 4003–4007, doi:10.1029/JC083iC08p04003.
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