|
meteoptic-l [ät] ursa.fi
message archive
This is meteoptic-l [ät] ursa.fi message archive.
Note, your can reply the messages on this page only if your
are already subscribed the list.
» To the end of the list/message
POLLEN CORONAS IN FOCUS 3/3
(3,4) The existence of coronas varies year by year. Some years
we don't any coronas by some tree and sometimes the coronas
are very bright and the appearance period last several weeks.
This is, of cource, more biology than atmospheric optics.
At the moment we have already some kind of idea, in which order
the "corona producing" tree are flowering, when and what is the
time between these periods. But also this varies yearly. The
order is approximately the same, but the time can vary in a
period of a month. That is depending on, how early spring we
have.
The subarctic latitude such as Finland, we have not very many
trees to produce suitable pollen concentrations, but I guess
in lower laitudes eg. in the Central Europe, there are much
diffrents trees, which can be potential pollen producers.
The appearance period start earlier. Eg. One of our observer,
Jukka Ruoskanen have reported elliptical corona in the clear
sky in middle June in Munich, Germany.
I would be interested to know, is there any plans to observe
this phenomenon eg. in Germany. We have already detected some
pollen coronas as early as beginning of March. We though to
origin of these could be alder pollen. For conifer pollen
coronas Scandinavia and Canada and also mountain regions could
be optional areas.
If you have any comments, questions, answers to question etc.
please, give your ideas to METEOPTIC list.
regards,
Veikko Makela
|