Wave Approach to Brightness Temperature from a Bounded Layer of Random Discrete Scatterers

By using of the fluctuation-dissipation theorem, we apply the strong fluctuation theory to the calculation of brightness temperatures from a bounded layer of random discrete scatterers with the zeroth and first order approximations. Various functional dependences on wavelength, polarization, observation angle, medium depth, scatterer constituents, and other physical parameters are discussed. Theoretical results are favorably matched with experimental data for passive remote sensing of snowpacks.