It's a rainbow-colored cloud! Or perhaps a fire rainbow. Or to put it more scientifically, it's a circumhorizontal arc.
Robert Nemiroff and Jerry Bonnell of NASA describe the unusual conditions that are necessary for one of these natural wonders to appear in the sky:
For
a circumhorizontal arc to be visible, the Sun must be at least 58
degrees high in a sky where cirrus clouds are present. Furthermore, the
numerous, flat, hexagonal ice-crystals that compose the cirrus cloud
must be aligned horizontally to properly refract sunlight in a
collectively similar manner. Therefore, circumhorizontal arcs are quite
unusual to see.
No comments:
Post a Comment