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12 October 1988 In-Flight Calibration Of Solar Irradiance Measurements By Direct Comparison With Stellar Observations
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Ultraviolet solar radiation in the spectral interval 120 to 300 nm is almost completely absorbed in the earth's middle atmosphere. Small changes in the amount of radiation incident at these wavelengths will result in corresponding changes in the photochemistry and energy balance of the stratosphere, mesosphere and lower thermosphere. Recent measurements indicate that solar cycle variability is far smaller than previous estimates. Although the Sun varies by nearly a factor of two at Lyman α (121.6 nm), at wavelengths from 120 to 170 nm the Sun varies by less than 20%. From 180 to 300 nm the variability quickly decreases to less than 1%. The challenge for future observations is to make spectral measurements with a long term accuracy far better than 1%. One approach is to directly compare the solar irradiance to the UV output of a number of bright early-type stars. The SOLar-STellar Irradiance Comparison Experiment (SOLSTICE) will first be flown on the Upper Atmosphere Research Satellite (UARS) and will make the first comparison of this type.
© (1988) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Gary J Rottman and Thomas N Woods "In-Flight Calibration Of Solar Irradiance Measurements By Direct Comparison With Stellar Observations", Proc. SPIE 0924, Recent Advances in Sensors, Radiometry, and Data Processing for Remote Sensing, (12 October 1988);

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