Irradiance of a floor per device frequency or wavelength. The terms spectral flux density or even more confusingly "spectral depth" will also be used. Non-SI models of spectral irradiance consist of Jansky = ten W⋅m⋅Hz and solar flux device (1SFU = ten W⋅m⋅Hz).Just as light passing from the atmosphere gets bent and distorted, so too does