 Filtered Rayleigh scattering

Filtered Rayleigh scattering is a technique often used in optical and atmospheric studies to analyze the scattering of light by small particles, such as molecules in the atmosphere. Rayleigh scattering refers to the elastic scattering of light (or other electromagnetic radiation) by particles much smaller than the wavelength of the light. This phenomenon is responsible for various optical effects, including the blue color of the sky.