Irradiance of the surface per unit frequency or wavelength. The phrases spectral flux density or maybe more confusingly "spectral depth" can also be used. Non-SI models of spectral irradiance include things like Jansky = ten W⋅m⋅Hz and solar flux unit (1SFU = 10 W⋅m⋅Hz). In the evening, scan the https://eldere086wfm3.wikipresses.com/user