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Dear friends,
Thank you from the record high pile of personal
messages regarding the Austrian sighting. In reply
messages I was asked to specify some details about
the halo by Kaiser as published in Mitteilungen
des AKM, as well as to answer some questions
about the European sightings of distorted Parry
arcs. Several of you asked almost the same questions
and some of you wanted to see them in the METEOPTIC.
OK, here are the answers;
- The display was seen on 9 October in Schlägl,
Oberösterreich (not far away from the Tschek republik
and Germany). And it was not a diamond dust
display "due to the Alpine mountain region".
- Yes, it was combined of 12 halo forms; 22 halo,
parhelia, 22 upper tangent arc, parhelic circle,
Lowitz arcs, 46 halo, circumzenithal arc, Parry
arc (the normal)," distorted Parry arcs", 120 parhelia,
120 parhelic arcs, heliac arc. Well, imagine that;
its quite Antarctican though from Austria; a part of
the reason for my yesterday's big enthusiasm about it.
- The "distorted parry arcs" differ from the normal
ones in their shape. Their both ends are twisted not
to touch the branches of 22 upper tangent arc, but
the sides of the 22 halo.
- The earliest observations known to us from distorted
Parry arcs are from autumn 1985. The first is from Germany,
August 1985. The earliest photographed might be the 6.9.
1985 display from Kuopio, but this is not certain.
- Yes, I agree; the heliac arc is a big rarity, but
it is probably not even near so rare as indicated by the
Dutch 0-statistics for time period 1892-1995. We have got
it twice, in 1985 and 1993 (that interval looks more like
how it should be seen). There is three problems that keep the
midlatitude heliac arcs from showing up in literature:
- Very few people understand the value of these phenomena,
- People do not understand to scrutiny well the photographs
of displays with major bright Parry arcs and parhelic circles,
- Even then found from photographs the arc is normally so
faint that it is not published.
- A rough guess: there might be some 5-15 heliac arcs in the
chests of drawers of USA. Scientific photo archives might have a
couple (without proper identification of the faint trace).
Thank you from the mail & the comments,
Regards, Marko
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