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This one occured on 3 April 1998. The spots near the horizon are lower 24° plate arcs. Sometimes is not easy - or even possible - to distinquish them from reflected Lowitz arcs. But this case is obvious, there is also a good lower 9° plate arc. Much fainter are 18°, 23° and upper 24° plate arcs. The display lasted for several hours, temperature was around -27° C. The source for this display is not known. Maybe it was natural.
[...] travels in search of halos have taken him to Resolute Bay in Canada and “the pole of cold” in Oymyakon, Siberia. At Oymyakon, in 1997, the optics were [...]
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