Preliminary results of aperture-area comparison for exo-atmospheric solar irradiance

B. Carol Johnson; Maritoni Litorja; James J. Butler

doi:10.1117/12.506904

10 November 2003 Preliminary results of aperture-area comparison for exo-atmospheric solar irradiance

B. Carol Johnson, Maritoni Litorja, James J. Butler

Proceedings Volume 5151, Earth Observing Systems VIII; (2003) https://doi.org/10.1117/12.506904
Event: Optical Science and Technology, SPIE's 48th Annual Meeting, 2003, San Diego, California, United States

Abstract

Exo-atmospheric solar irradiance measurements made by the solar irradiance community over the past 25 years incorporated limiting apertures measured by a number of metrology laboratories using a variety of techniques. Knowledge of the aperture area is a critical component in the conversion of radiant flux measurements to solar irradiance. An Earth Observing System (EOS)-sponsored international comparison of aperture area measurements of limiting apertures provided by solar irradiance researchers is under way, the effort being executed by the National Institute of Standards and Technology (NIST) in coordination with the EOS Project Science Office. Apertures that have institutional heritage with historical solar irradiance measurements are measured using the absolute aperture measurement facility at NIST. The measurement technique employs non-contact video microscopy using a high-precision stage. The aperture area comparison aims to quantify the relative differences between the participating institutions' aperture area measurements. Preliminary results of the comparison will be reported.

Citation Download Citation

B. Carol Johnson, Maritoni Litorja, and James J. Butler "Preliminary results of aperture-area comparison for exo-atmospheric solar irradiance", Proc. SPIE 5151, Earth Observing Systems VIII, (10 November 2003); https://doi.org/10.1117/12.506904

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