infralateral tangent arcs

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infralateral tangent arcs [¦in·frə¦lad·ə·rəl ′tan·jənt ‚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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