Circumzenithal arc Circumhorizontal arc Kern arc [edit] External links
Circumzenithal arc From Wikipedia, the free encyclopedia Jump to: ... 2004 printing. Les Cowley. "Circumzenithal Arc". Atmospheric optics. ... Italy Timelapse video of weak Circumzenithal Arc Rare upside-down rainbow spotted in the UK This optics-related article is a stub. ... You can help Wikipedia by expanding it. Retrieved from "http://en.wikipedia.org/wiki/Circumzenithal_arc" Categories:Geometrical optics Atmospheric optical phenomena Optics stubs Atmospheric science stubs Views Article Discussion Edit this page History ... The circumzenithal arc can be confused with the 22° halo when the sun is located near zenith.example [edit] References David K. ... ND, January 2007. The circumzenithal arc or cicumzenith arc (CZA), ... Personal tools Log in / create account Navigation Main page Contents Featured content Current events Random article Search Interaction About Wikipedia Community portal Recent changes Contact Wikipedia Donate to Wikipedia Help Toolbox What links here Related ... and then it is about 22° in radius, 3° in width, and tangent to the supralateral arc (if present). ... also called the Bravais' arc, is an optical phenomenon similar in appearance to a rainbow and arising from refraction of sunlight through non-terminated, ... navigation, search July 10, 2005. High above the horizon over Grand Forks, ... Circumzenithal arc From Wikipedia, the free encyclopedia Jump to: ... navigation, search July 10, 2005. High above the horizon over Grand Forks, ... ND, January 2007. The circumzenithal arc or cicumzenith arc (CZA), ... also called the Bravais' arc, is an optical phenomenon similar in appearance to a rainbow and arising from refraction of sunlight through non-terminated, ... horizontally-oriented ice crystals in certain clouds. It takes the shape of one-quarter of a circle centered at the zenith and parallel to the horizon, ... on the same side as the sun. Its colors run from blue near the zenith to red towards the horizon; it is one of the brightest and most colorful halos. ... The light that forms the CZA enters an ice crystal through its horizontal top face and exits through a vertical side face (the angle of separation must be 90°). ... This means that it occurs only when the sun is at a lower altitude than 32.2° above the horizon. ... The CZA is brightest when the sun is at 22° above the horizon (causing sunlight to enter and exit the crystals at the minimum deviation angle), ... and then it is about 22° in radius, 3° in width, and tangent to the supralateral arc (if present). ... However, the CZA can have any radius between 32.2° and 0°, ... but at either of these points it is vanishingly faint. As the sun rises above 32.2°, ... light exits the crystals through the horizontal bottom face instead to contribute to the colorless parhelic circle. ... The circumzenithal arc can be confused with the 22° halo when the sun is located near zenith.example [edit] References David K. ... Lynch and William Livingston. Color and Light in Nature. 2nd ed, ... 2004 printing. Les Cowley. "Circumzenithal Arc". Atmospheric optics. ... Retrieved on 2007-04-23. Les Cowley. "CZA - Effect of solar altitude". ... Atmospheric Optics. Retrieved on 2007-04-23. [edit] See also Wikimedia Commons has media related to: ... Circumzenithal arc Circumhorizontal arc Kern arc [edit] External links Atmospheric Optics - Circumzenithal Arc Gallery Circumzenithal arc over Rome, ... Italy Timelapse video of weak Circumzenithal Arc Rare upside-down rainbow spotted in the UK This optics-related article is a stub. ... You can help Wikipedia by expanding it. This climatology/meteorology-related article is a stub. ... You can help Wikipedia by expanding it. Retrieved from "http://en.wikipedia.org/wiki/Circumzenithal_arc" Categories:Geometrical optics Atmospheric optical phenomena Optics stubs Atmospheric science stubs Views Article Discussion Edit this page History ... Personal tools Log in / create account Navigation Main page Contents Featured content Current events Random article Search Interaction About Wikipedia Community portal Recent changes Contact Wikipedia Donate to Wikipedia Help Toolbox What links here Related ... changes Upload file Special pages Printable version Permanent linkCite this page Languages Deutsch 日本語 Nederlands Polski Slovenčina This page was last modified on 18 September 2008, ... at 23:55. All text is available under the terms of the GNU Free Documentation License. ... (See Copyrights for details.) Wikipedia(R) is a registered trademark of the Wikimedia Foundation, ... Inc., a U.S. registered 501(c)(3) tax-deductible nonprofit charity. ...