Satellite irradiance measurements reported in Scientific Report No. on this contract were influenced by the variable atmospheric background radiance, especially during twilight hours. Measurements of the 0.7—3.0 u. radiance of the atmosphere during twilight have been made as a function of time and zenith angle. This enables the calculation of scattering diagrams for aerosols in the upper atmosphere. Particles near the tropopause are found to scatter predominantly in the forward direction, typical of dielectric spheres. Particles near 32 kilometers are found to scatter in the backward direction, as do conductive spheres. It is shown that the data interpretation is not influenced by nonsense vative scattering which may be expected due to water absorption bands in the aerosols in the near infrared.
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