Abstract. Models developed to describe the experimentally observed phenomenon of extremely weak light scattering by an atmospheric aerosol particle are presented. This scattering phenomenon is due to the particle size being matched to the thickness of the coating layer. For the model development, experimental data obtained with simultaneous use of an optical counter and a filter aspiration device were used. Theoretical foundations of modeling the process of light scattering by a particle of atmospheric aerosol with refractive index radially changing in the coating layer are considered. The model is based on data from field experiments and may be used to solve both discontinuous and continuous problems of the process of electromagnetic waves scattering by inhomogeneous irradiated structures. The model is considered to adequately describe the experimental data since the discrepancy between them and results of model calculations does not exceed the experimental error. Using unique experimental data, new models of an inhomogeneous aerosol particle are proposed, which adequately describe the process of extremely weak directional scattering of radiation.

Keywords: model, atmospheric aerosol, light scattering, optical counter, particle size, determination error, aspiration device

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