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ELLIPTICAL CORONA (S+T Apr 95, p. 99)
In the Observer's Notebook there was a review and a sketch
of an elliptical corona made by Russ Sampson in February
- There was speculated that the ellicity is due to
the phase of the Moon. It might be, but one possibility
is also a corona caused by pollen. The coronae in the
drawing is so well defined and colourful (of course a
photograph should be better evidence). Also the size of
the corona indicates pollen particles or cirrostratus
clouds, not any mid-level water clouds.
I don't know about the climate of the observing, Alberta in
Canada, so I couldn't say anything about the existence of
pollen. But eg. in Finland the earliest pollen corona are seen
in March by alder pollen.
HALOS AND OTHER NICE PHOTOS (S+T May 95, pp. 100-104)
Barlow Pepin have collected nice set of atmospheric phenomena
into the article "Atmospheric Symphonies". There are many
nice halo photos, and also pictures of fogbow, iridescence
and anticrepuscular rays.
I don't handle this article very much, but just few comments
on the images:
(1) Circumscribed halo on page 101. The light pillar cross
the Sunn seems more like a optical effect in camera than a
real halo.
(2) The coloured contrail on page 103 is probable a part of
circumhorizontal arc. It is a halo phenomenon, I am quite
sure of that. The order of colors fits to circumhorizontal
are. Only the shape of shape makes the phenomenon looking
unfamiliar.
regards,
-Veikko Makela-
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