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ATMO/OPTI 656b Spring 2009 Scattering plane z is the direction of the incident light propagation (p.61) x-polarized light (BH p. 101) recreate BH figures using matlab What do we need for the solution Scattering and absorption by the particle Need the far field solution of the scattered wave Need the solution for the internal wave as this is relevant to absorption by the particle The scattered wave and internal wave solutions are written in term of the superposition of normal modes of EM fields generated by the spherical particle xQ (4.61) xQ (4.62) and Qabs follows from (3.25). All infinite series can be truncated after nmax terms. For this number Bohren and Huffman (1983) proposed the value 24 3/1 ++= xxn (p.477) and this value is used here as well. max Need the angular dependence Forward scattering Single versus multiple scattering Radar backscatter r6. Rainfall rate r4. S-pol radar Extinction paradox Absorption dominates over scattering for sufficiently small absorbing particles effect of same aerosol at visible and IR wavelengths (as particle size become much smaller than wavelength, absorption dominates) index of refraction depends on wavelength 1 ERK 4/28/09 ATMO/OPTI 656b Spring 2009 when we see light scattered from a cloud, approximately how many times has that light scattered? 2 ERK 4/28/09