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The halo phenomenon around the sun is most characteristically produced by

  • A.altostratus
  • B.stratocumulus
  • C.cumulus
  • D.cirrostratus

Answer: D

Correct answer: cirrostratus

A halo requires ice crystals, and cirrostratus is the thin, uniform ice cloud that veils the whole sky - often so tenuous that the halo is the only sign it is there. Altostratus is thicker and dims the sun to a watery disc, while stratocumulus and cumulus are water droplet clouds and produce a corona rather than a halo.

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