Determination of the Angstrom turbidity parameters.

We have analyzed the dependence of the Angstrom turbidity parameters on wavelength throughout the visible range by three different methods. We have obtained significant results about the ability of these parameters to represent the turbidity of the atmosphere. An important variation of these coefficients with the wavelength is shown, depending on the method used and the spectral resolution of the data. The log-log plot of aerosol optical thickness vs wavelength appears as an adequate method of obtaining the Angstrom parameters to represent the turbidity of the atmosphere and to model the effect of aerosols on solar radiation.