Accurate solar 'constant' determinations by cavity pyrheliometers

Computer Science – Sound

Scientific paper

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Pyroheliometers, Rocket-Borne Instruments, Solar Constant, Sounding Rockets, Earth Radiation Budget, Nimbus 6 Satellite, Ozone, Solar Terrestrial Interactions

Scientific paper

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/sq m average solar 'constant' result is uncertain by less than + or - 0.5%, the most accurate determination to date. Nearly simultaneous observations by the Nimbus 6 earth-radiation-budget total-irradiance detector of 1389-W/sq m 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.

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