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]


Wikimedia Foundation. 2010.

Игры ⚽ Нужна курсовая?

Look at other dictionaries:

  • Anthelion — An anthelion (plural anthelia, from late Greek ανθηλιος, opposite the sun ) is a rare optical phenomenon appearing on the parhelic circle opposite to the sun as a faint white halo, not unlike a sundog.How anthelions are formed is disputed. Walter …   Wikipedia

  • False sunrise — Extremely rare False Sunrise as seen near Bologna, Italy in October 2008. Note the lake reflection effect which is not real because there is no water in between. A false sunrise or dawn sundog is a very particular kind of parhelion, belonging to… …   Wikipedia

  • Glory (optical phenomenon) — A glory is an optical phenomenon appearing much like an iconic Saint s halo about the head of the observer which is produced by light backscattered (a combination of diffraction, reflection and refraction) towards its source by a cloud of… …   Wikipedia

  • Heiligenschein — (German for aureole or halo , literally Saint s shine ) is an optical phenomenon which creates a bright spot around the shadow of the viewer s head. It is created when the surface on which the shadow falls has special optical characteristics.… …   Wikipedia

  • Antisolar point — The antisolar point is the imaginary point on the celestial sphere exactly opposite the Sun. It is where anticrepuscular rays appear to converge, and on a moonless night away from city lights, it is often possible to see the gegenschein there.… …   Wikipedia

Share the article and excerpts

Direct link
… Do a right-click on the link above
and select “Copy Link”