Arago distance: Difference between revisions
From Glossary of Meteorology
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|Meaning=The angular distance from the [[antisolar point]] to the [[Arago point]]. | |||
|Explanation=The Arago distance is sensitive to the presence of foreign [[scattering]] particles in the [[atmosphere]] since these increase the contribution of the negative (horizontal) component of [[skylight]] polarization and hence shift the location of the point where the negative component is just equalled by the positive component. Thus the Arago distance is a useful measure of atmospheric [[turbidity]]. Its value is generally close to 20°, and is a function of solar [[elevation angle]] and of the [[wavelength]] of the [[light]] with which [[polarization]] is studied.<br/> Sekera, Z. 1951. Compendium of Meteorology. 79–90. | |||
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Latest revision as of 21:31, 13 January 2024
The angular distance from the antisolar point to the Arago point.
The Arago distance is sensitive to the presence of foreign scattering particles in the atmosphere since these increase the contribution of the negative (horizontal) component of skylight polarization and hence shift the location of the point where the negative component is just equalled by the positive component. Thus the Arago distance is a useful measure of atmospheric turbidity. Its value is generally close to 20°, and is a function of solar elevation angle and of the wavelength of the light with which polarization is studied.
Sekera, Z. 1951. Compendium of Meteorology. 79–90.
