Solar Energy · 1960 · 2.5K citations · 7 references
Natural SciencesAstronomyPhysicsAstrophysicsAtmospheric RadiationRadiation DetectionRadiative ProcessesSolar AtmosphereSolar IrradianceSolar PhysicsSolar RadiationSurface Radiation BudgetDiffuse Solar RadiationDirect Solar RadiationIncoming Solar RadiationSolar Radiation DistributionTotal Solar Irradiance
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Francis S. Johnson · Journal of Meteorology · 1954 · 431 citations · Full text
Direct solar radiation available on clear days
Solar Energy · 1958 · 58 citations