Abstract
Results are presented of an experiment to determine extraterrestrial solar
spectral irradiance at the earth's mean solar distance within the
300–2500 nm wavelength region. Spectroradiometric measurements were
performed during eleven research flights on board a NASA CV-990 aircraft at
altitudes between 11.6 km and 12.5 km. Precision of the measurements was better
than ±1%. Absolute accuracy of the resultant extraterrestrial
solar spectral irradiance is approximately ±3% over most of the
measurement range. A listing of results is presented at intervals varying from
0.1 nm throughout most of the uv–visible Fraunhofer region to 5 nm in
the continuum region of the ir. Additionally, a listing of solar spectral
irradiance, smoothed over the detailed Fraunhofer structure, is presented for
engineering use.
© 1969 Optical Society of America
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