English: Direct solar radiation as a function of secant of solar zenith angle at Niamey, Niger. December 24, 2006. From ARM data, from MFRSR instrument. Wavelength in units of nanometers is indicated. Log is base 10. Date 26 is incorrect in image name.
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{{subst:Upload marker added by en.wp UW}} {{Information |Description = {{en|Direct solar radiation as a function of secant of solar zenith angle at Niamey, Niger. December 24, 2006. From ARM data, from MFRSR instrument.}} |Source = Mathematica |Date ...