Arago point: Difference between revisions

Latest revision as of 21:31, 13 January 2024

One of the three commonly detectable points along the vertical circle through the sun at which the degree of polarization of skylight goes to zero; a neutral point.

The Arago point, so named for its discoverer, is customarily located at about 20° above the antisolar point, but it lies at higher elevations in turbid air. The latter property makes the Arago distance a useful measure of atmospheric turbidity. Measurements of the location of this neutral point are typically more easily carried out than measurements of the Babinet point and the Brewster point, both of which lie so close to the sun (about 20° above and below the sun, respectively) that glare problems become serious.
Neuberger, H. 1951. Introduction to Physical Meteorology. 196–204.

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+{{Term
+|Display title=Arago point
-{{TermHeader}}
+|Definitions={{Definition
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+|Num=1
+|Meaning=One of the three commonly detectable points along the vertical circle through the sun  at which the [[degree of polarization]] of [[skylight]] goes to zero; a [[neutral point]].
-<div class="termentry">
+|Explanation=The Arago point, so named for its discoverer, is customarily located at about 20&#x000b0; above the  [[antisolar point]], but it lies at higher elevations in turbid air. The latter property makes the [[Arago distance|Arago  distance]] a useful measure of atmospheric [[turbidity]]. Measurements of the location of this neutral  point are typically more easily carried out than measurements of the [[Babinet point]] and the [[Brewster point|Brewster  point]], both of which lie so close to the sun (about 20&#x000b0; above and below the sun, respectively)  that [[glare]] problems become serious.<br/> Neuberger, H. 1951. Introduction to Physical Meteorology.  196&ndash;204.
-  <div class="term">
+}}
-== Arago point ==
+}}
-  </div>
-<div class="definition"><div class="short_definition">One of the three commonly detectable points along the vertical circle through the sun  at which the [[degree of polarization]] of [[skylight]] goes to zero; a [[neutral point]].</div><br/> <div class="paragraph">The Arago point, so named for its discoverer, is customarily located at about 20&deg; above the  [[antisolar point]], but it lies at higher elevations in turbid air. The latter property makes the [[Arago  distance]] a useful measure of atmospheric [[turbidity]]. Measurements of the location of this neutral  point are typically more easily carried out than measurements of the [[Babinet point]] and the [[Brewster  point]], both of which lie so close to the sun (about 20&deg; above and below the sun, respectively)  that [[glare]] problems become serious.</div><br/> </div><div class="reference">Neuberger, H. 1951. Introduction to Physical Meteorology.  196&ndash;204. </div><br/>
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-[[Category:Terms_A]]