カーンアーク

noun

Kern arc

A rare optical phenomenon; a faint, colorless arc near the circumzenithal arc, named after its discoverer. Technical term used in meteorology and atmospheric optics.

• カーンアークは非ひ常じょうに珍めずらしい大たい気き光こう学がく現げん象しょうの一ひとつです。

  The Kern arc is one of the very rare atmospheric optical phenomena.