ACRIM III Radiometer Cavity Reflectance at a Variety of Wavelengths across the Solar Spectrum

Details ACRIM III Radiometer Cavity Reflectance at a Variety of Wavelengths across the Solar Spectrum ACRIM III Radiometer Cavity Reflectance at a Variety of Wavelengths across the Solar Spectrum

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmgc21b0869l&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #GC21B-0869

Astronomy and Astrophysics

Astrophysics

[1650] Global Change / Solar Variability, [3305] Atmospheric Processes / Climate Change And Variability, [7538] Solar Physics, Astrophysics, And Astronomy / Solar Irradiance, [7594] Solar Physics, Astrophysics, And Astronomy / Instruments And Techniques

Scientific paper

We will present measurements of the reflected power from a spare ACRIM III radiometer cavity at a variety of wavelengths across the solar spectrum in order to generate a correction factor for the ACRIM III Total Solar Irradiance (TSI) measurements. These measurements are being performed as part of the NRL support of the ACRIMSAT Mission Extension. The cavity reflectance will be measured using a laser and integrating sphere technique at several wavelengths from the visible to the infra-red (IR). The visible wavelengths will be 457 nm, 488 nm, 532 nm, and 633 nm. The measurements at the IR wavelengths will include measurements at between 1 µm and 5 µm and between 9 µm and 11 µm. The results will include measurements where the laser has been rastered across the cavity entrance to produce a reflectance map. Uncertainty goals for the measurements are < 25 ppm in the visible and < 50 ppm in the IR.

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