Parry arcs

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Parry arcs are two arcs found immediately above and below the 22 degree halo which can be seen at rare occasions. They are named after admiral Parry who observed them during his search for the northwest passage.
The upper Parry arc is the most frequently occurring of the two. In conjunction with the circumscribed halo it makes a shape like a lemon fruit. Parry arcs arise from ice columns orientated with their axes horizontal and a pair of opposite side faces horizontal.


 
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