Difference between revisions of "Tangent arcs"
From Glossary of Meteorology
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| − | <div class="definition"><div class="short_definition">A [[halo]] in the form of an arc tangent to a circular halo.</div><br/> <div class="paragraph">The most common of these are the upper and lower tangent arcs to the [[halo of 22& | + | <div class="definition"><div class="short_definition">A [[halo]] in the form of an arc tangent to a circular halo.</div><br/> <div class="paragraph">The most common of these are the upper and lower tangent arcs to the [[halo of 22°]]. They form separate arcs when the sun is low, but as the sun climbs they join to produce the [[circumscribed halo]]. These arcs are explained by [[refraction]] through the 60° prism sides of columnar crystals oriented with their long axes horizontal. <br/>''See'' [[46° lateral arcs]].</div><br/> </div> |
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Revision as of 16:16, 20 February 2012
tangent arcs
A halo in the form of an arc tangent to a circular halo.
The most common of these are the upper and lower tangent arcs to the halo of 22°. They form separate arcs when the sun is low, but as the sun climbs they join to produce the circumscribed halo. These arcs are explained by refraction through the 60° prism sides of columnar crystals oriented with their long axes horizontal.
See 46° lateral arcs.
See 46° lateral arcs.
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