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> The phenomenon of a pollen corona - which is probably nothing
> really unusual for the Finnish observers - was visible for almost
> 3 days in a row from parts of Germany and neighbouring regions
> from May 10 to 12 during day and night (nearly full Moon).
> In the Potsdam/Berlin area, the corona was caused by pine pollens.
> We had calm weather and a temperature inversion at about 3 km
> elevation, so the pollen concentration was quite high.
On that time it was birch pollen time in FInland, pines are active
right now. Of course, the in more southern latitudes you have
those earlier. Nice site for following pollen situation in Europe
is EPI (European POllen Information) at http://www.cat.at/pollen/.
It should link your page into METEOPTIC homepage. BTW, in the
refence list there are missing the paper were we give presentation
of the phenomenon. It is the same issue of Applied Optics where
was Tränkle's and Mielke's paper on simulations. Our paper is:
P. Parviainen, C. F. Bohren, and V. Mäkelä, "Vertical elliptical
coronas caused by pollen," Appl. Opt. 33, 4548-4562 (1994).
I just look the Applied Optics Online and there seems be a new
article:
F.M.Mirnslll, "Solar Corona Caused by Juniper Pollen in Texas",
Appl. Opt. 37, 1486-1488
The Applied Optics Online is at http://epubs.osa.org/aoo/, but
there seems to be only paper during 1997-98. But anyway this
link could be useful for all interested in atmospheric optics.
-VeikkoM-
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