Subparhelic circle

Subparhelic circle

The subparhelic circle is a rare halo, an optical phenomenon located below the horizon. It passes through both the subsun, below the sun, and the antisolar point, opposite to the sun. The subparhelic circle is the subhorizon counterpart to the parhelic circle located above the horizon.

Located on the subparhelic circle are several relatively rare optical phenomena: The subsun, the subparhelia, the (still undocumented) 120° subparhelia, Liljequist subparhelia, the diffuse arcs, and the Parry antisolar arcs.cite web
url = http://www.atoptics.co.uk/halo/subhor.htm
title = Subhorizon Arcs | author = Les Cowley
publisher = Atmospheric Optics | accessdate = 2007-04-21 (including a computer simulation.)] cite web
url = http://www.atoptics.co.uk/halo/antisol.htm
title = Antisolar Region Arcs | author = Les Cowley
publisher = Atmospheric Optics | accessdate = 2007-04-21 (including a photo and a computer simulation.)]

On the accompanying photo centred on the antisolar point, the subparhelic circle is viewable as a gently curved horizontal line intercepted by anthelic arcs.cite web
url = http://haloreports.blogspot.com/2006_08_01_haloreports_archive.html
title = Subhorizon diffuse arcs with Liljequist subparhelia | author = Jarmo Moilanen
publisher = Halo Reports (Blogspot) | accessdate = 2007-04-21]

References

See also

* 120° parhelion
* Anthelion

External links

* [http://www.meteoros.de/php/viewtopic.php?p=18248&sid=d6979d0570ab672fbf4b31fb20bdee6a Another photo from a plane]
* [http://www.atoptics.co.uk/halo/antisol.htm Antisolar Region Arcs]


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