Supralateral and infralateral arcs.

The supralateral and infralateral arcs are brightly coloured arcs seen at rare occasions. The supralateral arc is often interpreted as a 46° halo. It can only form when the solar altitude is less then 32°. The identification is easy only when both the supralateral and the 46° halo are present. The infralateral arc can show up at any solar altitude.

 
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