|
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
Hello!
This is the first time when I write to meteoptic. I am an amateur
astronomer and the leader of the Atmospheric light phenomena section of
Astronomical Association URSA in Finland. You surely know that Finnish
observers found the pollen coronas some years ago. Now again an
interesting light phenomena has been found in Finland. I think that it
is not known in the literature of the atmospheric light phenomena. This
phenomenon is caused by some algaes on the water surface. Very bright
coronas, stripes of colours and light arcs have been observed. The
colours of the phenomenon are the brightest that I have seen in nature.
Last year colourful arcs and coronas were observed on the water surface
by Jouko Markkanen and Krista Vajanto at Kirkkonummi. They could be
seen also this year. Around the subsun point there was a colourful
corona with brightenings (like pine pollen corona) and five horizontal
bows, that had also brightenings at both sides. Around the shadow of
the observers there was also rings and a horizontal bow with vertical
arcs. This year also new different observations were made by Eero
Savolainen at Hirvensalmi and by Jari Piikki, Simo Kaksonen and Teuvo
Savolainen at Juva. Eero Savolainen observed a coronalike phenomenon
around the reflection of the Sun. At Juva there was a same phenomenon
with brightenings and also several stripes of colours before the
sunrise. Samples of the water were taken in all of these cases. Many
algaes were found but it is unsure, which of them caused the colours.
Only one case (Juva) is quite surely caused by Botryococcus-algae.
Do you have any observations about this kind of effects? Is anybody
interested in simulating the effects? The photos are INCREDIBLE!!!!
Jari Piikki
Ahotie 2 D 3
51900 JUVA
Finland
jari.piikki_at_pp.kolumbus.fi
|