120° parhelion

120° parhelion

A 120° parhelion (plural: 120° parhelia) is a relatively rare halo, an optical phenomenon occasionally appearing along with very bright sun dogs (also called parhelia) as ice crystal-saturated cirrus clouds fill the atmosphere. The 120° parhelia are named for appearing in pair on the parhelic circle ±120° from the sun.cite web
url = http://www.engl.paraselene.de/html/120o_parhelia.html
title = 120° Parhelia | publisher = www.paraselene.de
accessdate = 2007-04-15 | author = (including an excellent HaloSim simulation.)]

120° parhelia appears as white-bluish bright spots on the white parhelic circle and are the product of at least two interior reflections in the hexagonal ice crystals. Their colour together with them being rather obscure can make observing them difficult as they tend to fuse with the clouds in the sky.cite web
url = http://www.atoptics.co.uk/halo/120pars.htm
title = 120° Parhelia | publisher = Atmospheric Optics
accessdate = 2007-04-15 | author = Les Cowley (?)]

References

See also

* Liljequist parhelion
* Subhelic arc

External links

* [http://photos1.blogger.com/blogger/1639/2131/1600/Popek_120.jpgA photo of a 120° parhelion in the Czech Republic in October 2006] ( [http://haloreports.blogspot.com/2006/10/more-rare-halos-in-czech.html blog] )
* [http://www.halo.astronomie.cz/galerie/120parh/010.jpgGreat photo by Joni Tornambe, 2006]


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