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Title: Metrology Requirements For The Measurement Of Solar Irradiance And Its Variation
Author: William E. Mcclintock, Thomas N. Woods, Frank G. Eparvier
Source: 2006 Measurement Science Conference
Year Published: 2006
Abstract: Accurate measurement of solar XUV-MUV radiation and its variation is essential for understanding the energy input to the earths atmosphere. Solar EUV-MUV irradiance varies a factor of 2 to only 1%, respectively, on 11-year solar cycle timescales with 27-day solar rotation variations that are about a factor of 3 smaller. XUV variability on solar cycle timescales is not well characterized but in contrast to EUV-MUV wavelengths, XUV emissions can vary by orders of magnitude in hours. Photometers and spectrometers aboard spacecraft have been used to study solar XUV-MUV radiation and its variations. These devices use Beamline 2 at the Synchrotron Ultraviolet Radiation Facility (SURF) at the National Institute for Standards and Technology (NIST) located in Gathersburg Md. for their primary preflight calibrations.

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