Abstract

<p>Two independent methods were used: direct spectrophotometry through the transparent windows of the atmospheric gases, and measurement of the number and diameter of the water droplets, followed by a Mie-theory calculation of the spectral transmittance. Results from the two methods are in good agreement when the media are sufficiently homogeneous, as for a quiet haze or fog and artificial smoke.</p><p>The following kinds of atmospheres were considered: <i>hazes</i> (optical density per km in the visible spectrum is less than 2); a small number of <i>small-drop fogs</i> (optical density per km less than 10); <i>evolving fogs</i> (which have changing distributions of drop-diameters); <i>nonevolving, slightly selective fogs; artificial smokes</i>. In addition, some information is given on the statistical distribution of drop-diameters.</p><p>It was found that the transmission of haze increased markedly with increasing wavelength, from the visible to 10 microns, but this marked increase was not found for fogs.</p>

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