Circumhorizontal arcs are atmospheric optical phenomena that appear as brightly colored bands parallel to the horizon. These striking displays often occur when sunlight refracts through horizontally-oriented ice crystals in cirrus clouds. The result is a vibrant spectrum of colors, resembling a flame-like streak suspended in the atmosphere.
These atmospheric occurrences, while visually stunning, offer insights into atmospheric conditions. Their presence indicates specific combinations of temperature, cloud composition, and solar angle. Historically, such events have been viewed with a mix of awe and superstition, sometimes interpreted as portents or divine signs, yet modern science provides a clear understanding of their formation.
