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- Q205928 subject Q7235929.
- Q205928 subject Q8488088.
- Q205928 abstract "The circumzenithal arc or circumzenith arc (CZA), also called the Bravais' arc, is an optical phenomenon similar in appearance to a rainbow, but it belongs to the family of halos arising from refraction of sunlight through ice crystals, generally in cirrus or cirrostratus clouds, rather than from raindrops. The arc is located at a considerable distance (approximately 46°) above the sun and at most forms a quarter of a circle centered on the zenith. It has been called "a smile in the sky", its first impression being that of an upside-down rainbow. The CZA is one of the brightest and most colorful members of the halo family. Its colors, ranging from violet on top to red at the bottom, are purer than those of a rainbow because there is much less overlap in their formation.Contrary to public awareness, the CZA is not a rare phenomenon (it occurs much more often than rainbows), but it tends to be overlooked since it occurs so far overhead. It is worthwhile to look out for it when sun dogs are visible, since the same type of ice crystals that cause them (plate-shaped hexagonal prisms in horizontal orientation) are responsible for the CZA.".
- Q205928 thumbnail Solar_halos_with_foreground,_Salem,_MA,_Oct_27,_2012.JPG?width=300.
- Q205928 wikiPageExternalLink czaform.htm.
- Q205928 wikiPageExternalLink czasalt.htm.
- Q205928 wikiPageExternalLink Atmospheric_Phenomena.
- Q205928 wikiPageExternalLink CZA.html.
- Q205928 wikiPageExternalLink folder?folder_id=646937.
- Q205928 wikiPageExternalLink cza.htm.
- Q205928 wikiPageExternalLink czaim1.htm.
- Q205928 wikiPageExternalLink 1-23-11.
- Q205928 wikiPageExternalLink alberta_halos.jpg?PHPSESSID=r5vsrr742oq6aq8cmtrgt018k7.
- Q205928 wikiPageExternalLink 654128.
- Q205928 wikiPageWikiLink Q104641.
- Q205928 wikiPageWikiLink Q1052.
- Q205928 wikiPageWikiLink Q1325808.
- Q205928 wikiPageWikiLink Q185638.
- Q205928 wikiPageWikiLink Q186310.
- Q205928 wikiPageWikiLink Q190132.
- Q205928 wikiPageWikiLink Q201564.
- Q205928 wikiPageWikiLink Q205897.
- Q205928 wikiPageWikiLink Q208589.
- Q205928 wikiPageWikiLink Q2628009.
- Q205928 wikiPageWikiLink Q3073153.
- Q205928 wikiPageWikiLink Q525.
- Q205928 wikiPageWikiLink Q72277.
- Q205928 wikiPageWikiLink Q7235929.
- Q205928 wikiPageWikiLink Q760129.
- Q205928 wikiPageWikiLink Q82806.
- Q205928 wikiPageWikiLink Q8488088.
- Q205928 comment "The circumzenithal arc or circumzenith arc (CZA), also called the Bravais' arc, is an optical phenomenon similar in appearance to a rainbow, but it belongs to the family of halos arising from refraction of sunlight through ice crystals, generally in cirrus or cirrostratus clouds, rather than from raindrops. The arc is located at a considerable distance (approximately 46°) above the sun and at most forms a quarter of a circle centered on the zenith.".
- Q205928 label "Circumzenithal arc".
- Q205928 depiction Solar_halos_with_foreground,_Salem,_MA,_Oct_27,_2012.JPG.