## Abstract

In Part 1 of this study1 it was shown theoretically that the aerosol size distribution may be derived from the single scattering radiance around a point source. In this paper preliminary results of aerosol size distribution derived by this method are presented. A solar blind radiometer designed and constructed for aureole measurements is described. It is shown that, if the light source is unobscured, a large systematic error may result, especially at small angles. This suggests the use of an obscured source. A comparison with the aerosol size distribution derived from transmittance measurements gives good agreement. A correlation is found between estimated visibility and aureole measurements.

© 1984 Optical Society of America

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### Equations (8)

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(1)
$${\gamma}_{\text{min}}=\frac{D+d}{2(R-r)},$$
(2)
$$\beta (\gamma +\varepsilon )=-\frac{\partial}{\partial \gamma}\left[\frac{{B}_{1}(\gamma ,R)R\hspace{0.17em}\text{sin}\gamma}{I}\right]\equiv -\frac{\partial}{\partial \gamma}[L(\gamma ,R)].$$
(3)
$${S}_{B}={B}_{1}(\gamma ,R)\xb7\mathrm{\Omega}\xb7A\xb7K,$$
(4)
$${S}_{I}=\frac{I}{{R}^{2}}\xb7A\xb7K.$$
(5)
$$L(\gamma ,R)=\frac{{S}_{B}\xb7\text{sin}\gamma}{{S}_{I}\xb7R\xb7\mathrm{\Omega}}.$$
(6)
$$L(\gamma ,R)=\text{exp}[(A-C\gamma )],$$
(7)
$$\beta (\theta )=C\hspace{0.17em}\text{exp}\{[A-C(\theta -\varepsilon )]\}={C}^{\prime}\hspace{0.17em}\text{exp}(-C\theta ),$$
(8)
$$\alpha =\frac{1}{10}\sqrt{\sum _{i=1}^{10}{\left(1-\frac{A-C{\gamma}_{i}}{\text{ln}{L}_{i}}\right)}^{2}}.$$