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单词 infralateral tangent arcs
释义 infralateral tangent arcs
[¦in·frǝ¦lad·ǝ·rǝl `tan·jǝnt ´ärks]
METEOROLOGY
Two oblique, colored arcs, convex toward the sun and tangent to the halo of 46° at points below the altitude of the sun, produced by refraction (90° effective prism angle) in hexagonal columnar ice crystals whose principal axes are horizontal but randomly directed in azimuth; if the sun's elevation exceeds about 68°, the arcs cannot appear.
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