Irradiance of the surface area per device frequency or wavelength. The terms spectral flux density or even more confusingly "spectral depth" also are used. Non-SI models of spectral irradiance incorporate Jansky = ten W⋅m⋅Hz and solar flux device (1SFU = ten W⋅m⋅Hz). phrase #beta Beta /beta #preferredDictionaries ^selected title https://jonahy964sai1.wikidirective.com/user