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PREFACE This report describes research performed by SERI's Resource Assessment and Instrumentation Branch to develop a cloud-cover modification to SERI's simple model for cloudless-sky spectral solar irradiance (SPCTRAL2). This research is part of a continuing effort to develop and verify spectral-solar-irradiance models and to build a spectral-irradiance data base for different locations and climates.doi:10.2172/6436871 fatcat:23niiuancneg3paz6yt7zrq3au