20th Century Solar Spectral Irradiance Modeling Based on Solar Cycle 22 and 23 Measurements

Physics

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3305 Climate Change And Variability (1616, 1635, 3309, 4215, 4513), 7537 Solar And Stellar Variability (1650), 7538 Solar Irradiance, 7549 Ultraviolet Emissions, 7974 Solar Effects

Scientific paper

Our long term solar spectral irradiance model under development will include EUV, UV, Visible, and IR spectral irradiance estimates. This model is based, in part, on Ca II K images collected from various observatories. For example, images from the Mt. Wilson Observatory supplemented with Greenwhich Sunspot data are used in the model to produce irradiance estimates for the time period before space-based spectral irradiance observations. The Mt. Wilson Ca II K film archive extending back to 1915 has been recently digitized. We expect to generate estimated spectra back to the start of this data set. We discuss the development details of the various spectral component derived from various spectra and proxies measured during Solar Cycle 22 and 23. Measured and estimated spectra will be compared in time series of various spectral bands as well as in spectra for days with specific solar surface configurations. This work is supported by the NASA LWS program.

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