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   Sundog Colours

  Sundog Close-up imaged by Mitsy Marx (images). The sun is to the right.

©Mitsy Krzywicki, shown with permission.
  
 

This close-up shows sundog colours well, although each sundog is differs slightly in its own way. The sunward edge is a tawny red progressing through orange, straws and smoky yellows to pastel greens and then a hint of blue.

There are no pure spectrum colours. Plate crystals forming the 'dog' are in all rotational positions about near vertical axes. The sun's rays therefore impinge on each crystal at different angles of incidence and skew causing some colour overlap that increases from red towards the blues.    22° halo colours are similarly mixed. Circumzenithal and circumhorizon arc colours are not.