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The FLARE Monte Carlo procedure, which computes the transport of monochromatic light emitted by either point or plane-parallel sources in a plane atmosphere, was made operational. The FLARE procedure treats problems involving light transport in atmospheres where the scattering and absorption processes vary with altitude. The FLARE procedure was used to compute the scattered and direct intensities as a function of direction and horizontal range at receiver altitudes of 0, 1, 2, 5, and 10 km. Problems were run for 550 nm wavelength point isotropic sources at 1, 2, 5, 20 and 80 km altitude in a model atmosphere with a ground level meteorological range of 10 km. Calculations were made for the 550 nm wavelength point isotropic source at 2 km altitude in model atmospheres with ground level meteorological ranges of 3, 10, 25, and 50 km. Additional calculations were also performed for 450, 550, and 650 nm wavelength point isotropic sources at 2 km altitude in the model atmosphere with a 10 km ground level meteorological range. (Author).
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This report describes modifications that were made to the POLO procedures to treat infrared absorption by the gaseous molecules in the atmosphere. Also described are the results of studies performed with the POLO procedure to compute time-dependent scattered light fluxes at satellite receivers for (1) 0.4278-, 0.75-, and 1.07-micrometer wavelength anisotropic point sources; (2) 0.4278-, 0.5-, 0.6-, 0.75-, and 1.07-micrometer wavelength point isotropic sources in a 40-km meteorological range atmosphere; (3) point isotropic sources emitting in the 2.7-micrometer wavelength band; and (4) point isotropic 0.4278-, 0.75-, and 1.07-micrometer wavelength sources in model atmospheres containing a cloud layer. Three computer codes are described which were developed for convoluting the POLO-calculated wavelength- and time-dependent atmospheric scattering data with wavelength- and time-dependent source data for thermal radiation sources. A calculational method is described that can be used to compute the Legendre polynomial coefficients required in discrete ordinates codes for defining the phase function for light scattering by aerosols and cloud particles.