Figure 4. Harmonics of pure and net solar radiation

Harmonics of the pure solar radiation according to formulae in Reed (1977) (same curves as in Fig.3) and the net solar received at the sea surface as modified by clouds. Values in W/m2. Black/Red: 1 and 2 cpy amplitudes of pure solar radiation. Green/Blue: 1 and 2 cpy amplitudes of radiation modified by cloudiness. Note that the net solar 1 cpy amplitude is larger than the 2 cpy amplitude everywhere (no 2 cpy maximum near the equator).
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