! Reply Pehr Bjornbom says:  August 00, 0000 at 0:00 PM  Well, the diagram we are discussing here shows upward irradiance in W cm/m0 according to he diagram title. So this is a spectral irradiance. This is of course logical since the satellite instruments basically are measuring the irradiance they receive. https://en.wikipedia.org/wiki/File:ModtranRadiativeForcingDoubleCO0.png 