Angstrom exponent

The Angstrom exponent or Ångström exponent is a parameter that describes how the optical thickness of an aerosol typically depends on the wavelength of the light. The Angstrom exponent or Ångström exponent is a parameter that describes how the optical thickness of an aerosol typically depends on the wavelength of the light. In 1929, the Swedish physicist Anders K. Ångström found that the optical thickness of an aerosol depends on the wavelength of light according to the power law where τ λ {displaystyle au _{lambda }} is the optical thickness at wavelength λ {displaystyle lambda } , and τ λ 0 {displaystyle au _{lambda _{0}}} is the optical thickness at the reference wavelength λ 0 {displaystyle lambda _{0}} . The parameter α {displaystyle alpha } is the Angstrom exponent of the aerosol.