Measurements 1992/1993 at 16 sites on the roof of Oldenburg University 

• time resolution: one second and one minute averages
• ascii data, archived with arj
• the data are measured with photovoltaic modules
• sorry, pyranometer data for calibration are not available
• take constant calibration factor of 1/(2.8) W/m/m instead 

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German description of data in diploma thesis:

Hammer, A. and Stolzenburg, K.: 1993, 'Analyse kurzfristiger Fluktuationen der Solarstrahlung unter Berücksichtigung von Wolkenfeldstrukturen', Diploma Thesis, University of Oldenburg, Germany

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