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F H O N s u m m a r y 1 9 9 5
S O M E O B S E R V A T I O N S
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Finnish Halo Observers Network (FHON):
summary of rare halos in observations of the year 1995
Jukka Ruoskanen (jruoskan_at_snakemail.hut.fi)
and Jarmo Moilanen (jarmom_at_netppl.fi)
With some help from: Marko Riikonen (Marko.Riikonen_at_ursa.fi)
Veikko Makela (Veikko.Makela_at_helsinki.fi)
Marko Pekkola (Marko.Pekkola_at_helsinki.fi)
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******
More informations about halos? Contact to FHON: halot_at_ursa.fi
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SOME OF THE FHON'S BEST DISPLAYS OF THE YEAR 1995
8. Apr. -95
First major display of the spring -95. Observed in southern part of
Finland.
Nice display with supra- and infralateral arcs included one jewel:
9 deg tangent arcs. Only Jani Katava saw those by naked eye. From slides
it
was found from Veikko Makela, Marko Pekkola, Marko Riikonen and Mika
Sillanpaa
in Helsinki and Ismo Luukkonen in Turku and Jukka Ruoskanen in Gylto.
28. Apr. -95
In Oulunsalo Jarmo Moilanen photographed bright parhelion in a hurry.
Later when
he studied photos he found 9, 18, 20 and 23 deg halos from those slides.
Later
on the same day Jarmo stopped in Pattijoki and saw an elliptical halo.
25. May -95
Great odd radius display In Espoo observed by Mika Sillanpaa. He saw 9,
18, 20
and 23 deg halos with 18deg lateral arcs and 23 deg parroid. Display
stayed on
the sky more than one and a half hour. In Helsinki, just a half hour drive
away,
group of observers got only some glimpse of that. Anne Jokinen got 9 and
23 deg
halos with 18 deg lateral arcs and 23 deg parroid. Veikko Makela got the
same
set but without 18 deg lateral arcs. 23 deg parroid was observed by Jere
Kahanpaa, Jani Katava and Marko Riikonen in Helsinki and by Eero
Savolainen in
Kuusankoski. 9 deg halo was found from Riikonen's slides afterwards.
26. May -95
Good column display this time in Oulunsalo observed by Jarmo Moilanen. The
sky
around sun was not so brilliant but there was faint Parry arc and good
infralateral arcs. 120 deg parhelion was seen alongside a faint parhelic
cirlce.
But most striking haloform in the sky was Greenler anthelic arcs which
took the
shape of big upside down V opposite to sun. Photographs showed that it had
faintly extended above the parhelic circle. In Savukoski Simo Aikioniemi
observed Greenler anthelic arcs as strong anthelion on the parhelic
circle.
28. May -95
Attacks of pyramidal ice crystals continued. Poorly oriented pyramidal
crystals
produced an upper part of a 23 deg halo in Degerby. This halo was observed
by
Jukka Ruoskanen and Marko Riikonen. Same halo was in Helsinki saw by Jani
katava,
Johanna Pekkola and Marko Pekkola. Marko Toivonen observed an 18 deg halo
in
Kuusankoski and a 120 deg parhelion was observed in the same city by Eero
Savolainen. Reima Eresmaa in Jyvaskyla observed both 9 deg halo and 120
deg
parhelion. In Imatra Veikko Makela witnessed the days best display, which
included 9 and 23 deg halo and 18 deg lateral arcs and 23 deg parroid.
28. Jun. -95
Complex halodisplay in Oulunsalo observed by Jarmo Moilanen. Several rare
haloforms was in the sky. infralateral arc, Parry arc, 120 deg parhelia,
120 deg parhelic arc, Wegener anthelic arc, Greenler anthelic arcs as an
anthelion, faint Tricker anthelic arc and colored Liljequist parhelia was
dokumented with photographs.
- Jul. -95
In souther Finland 23 deg parroid was observed by Marko Riikonen and Eero
Savolainen. One of the best display of the summer was spotted in Juva by
Jari
Piikki. Fine display included Parry arc, infralateral arc and Lowitz arcs.
All
three component (upper, lower and circular) of Lowitz arcs was psesent
near
parhelia.
- Jul. -95
In Siuntio Jukka Ruoskanen ran from train to home to get camera because in
the sky 9 and 24 deg halos was visible.
- Sep. -95
Very strong and brilliant halodisplay in Savukoski observed by Simo
Aikioniemi.
Brighness of circumzenithal arc makes observer to wrote that "it doesn't
make
any sence". Display included also Greenler and Tricker anthelic arcs.
- Nov. -95
In temperature of -18C a very strong diamond dust display in Oulunsalo
reported
by Jarmo Moilanen. This is perhaps one of the best low level displays
recorded
in Finland. Strong upper tangent arc with supra- and infralateral arcs
(faintly
in front of ground!) and Greenler anthelic arcs. Also upper 9 deg parroid
was
observed as a sparkling in the sky.
First version of FHON summary -95 was published in Finnish in Ursa Minor
2/96 by
Jukka Ruoskanen.
FHON is halo section under subordination of Ursa.
Ursa Astronomical Association
Raatimiehenkatu 3 A 2
FIN-00140 HELSINKI
tel. +358 0 174 048
FAX +358 0 657 728
Current section leader is Veikko Makela (Veikko.Makela_at_helsinki.fi).
- That's all folks! Have a nice skywatching! ***************
FHON **
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