Here a faint upper suncave Parry arc. 12 image stack. Single frame reveals only tangent arcs, no trace of Parry. Interestingly this display is formed only by the column shaped ice crystals, no plate crystals here.
Same stack as the above image but without the Usm filter.
Parhelias at parking lot.
About 2 hours later column arcs are vanished and replaced by the plate crystals.
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