Matches in DBpedia 2014 for { <http://dbpedia.org/resource/Circumhorizontal_arc> ?p ?o. }
Showing items 1 to 42 of
42
with 100 items per page.
- Circumhorizontal_arc abstract "A circumhorizontal arc is an optical phenomenon - an ice-halo formed by plate-shaped ice crystals in high level cirrus clouds.Other currently accepted names for the phenomenon are circumhorizon arc or lower symmetric 46° plate arc. The misleading term "fire rainbow" is sometimes used to describe these phenomena, although they are neither rainbows, nor related in any way to fire. The name comes from its appearance as a rainbow taking the shape of flames in the sky.The complete halo is a huge, multi-coloured band running parallel to the horizon with its centre beneath the sun. The distance below the sun is twice as far as the common 22-degree halo. Red is the uppermost colour. Often, when the halo-forming cloud is small or patchy, only fragments of the arc are seen.How often a circumhorizontal arc is seen, depends on the location and the latitude of the observer. In the United States it is a relatively common halo seen several times each summer in any one place. In contrast, it is rare phenomenon in northern Europe for several reasons. Formation of the halo requires that the sun be very high in the sky, at an elevation of 58° or greater, and that a cirrus cloud or haze be present and contain plate-shaped ice crystals. The sun's altitude determines the visibility of the halo; it is impossible to see at locations north of 55°N or south of 55°S (although a lunar circumhorizon arc might be visible at other latitudes). At other latitudes the phenomenon is visible, for a greater or lesser time, around the summer solstice. Slots of visibility for different latitudes and locations may be looked up here. For example, in London, England the sun is only high enough for 140 hours between mid-May and late July. Contrast that with Los Angeles, with the sun higher than 58 degrees for 670 hours between late March and late September.The halo is formed by sunlight entering horizontally-oriented, flat, hexagon ice crystals through a vertical side face and leaving through the near horizontal bottom face (plate thickness does not affect the formation of the halo). In principle, Parry oriented column crystals may also produce the arc, although this is rare. The 90° inclination between the ray entrance and exit faces produce the well-separated spectral colours. The arc has a considerable angular extent and thus, rarely is complete. When only fragments of a cirrus cloud are in the appropriate sky and sun position, they may appear to shine with spectral colours.A circumhorizontal arc may be difficult to distinguish from an infralateral arc when the sun is high in the sky. The former is always parallel to the horizon, whereas the latter curves upward at its ends.".
- Circumhorizontal_arc thumbnail SunArcs2011Oregon.png?width=300.
- Circumhorizontal_arc wikiPageExternalLink cha2.htm.
- Circumhorizontal_arc wikiPageExternalLink chafreq.htm.
- Circumhorizontal_arc wikiPageExternalLink chaim0.htm.
- Circumhorizontal_arc wikiPageExternalLink ee23e.htm.
- Circumhorizontal_arc wikiPageExternalLink album.php?cat=optics&subcat=circumhorizon_arc.
- Circumhorizontal_arc wikiPageID "5684672".
- Circumhorizontal_arc wikiPageRevisionID "603037066".
- Circumhorizontal_arc hasPhotoCollection Circumhorizontal_arc.
- Circumhorizontal_arc subject Category:Atmospheric_optical_phenomena.
- Circumhorizontal_arc type AtmosphericOpticalPhenomena.
- Circumhorizontal_arc type NaturalPhenomenon111408559.
- Circumhorizontal_arc type OpticalPhenomenon111490638.
- Circumhorizontal_arc type Phenomenon100034213.
- Circumhorizontal_arc type PhysicalEntity100001930.
- Circumhorizontal_arc type PhysicalPhenomenon111419404.
- Circumhorizontal_arc type Process100029677.
- Circumhorizontal_arc comment "A circumhorizontal arc is an optical phenomenon - an ice-halo formed by plate-shaped ice crystals in high level cirrus clouds.Other currently accepted names for the phenomenon are circumhorizon arc or lower symmetric 46° plate arc. The misleading term "fire rainbow" is sometimes used to describe these phenomena, although they are neither rainbows, nor related in any way to fire.".
- Circumhorizontal_arc label "Arc circumhorizontal".
- Circumhorizontal_arc label "Arco circum-horizontal".
- Circumhorizontal_arc label "Arco circunhorizontal".
- Circumhorizontal_arc label "Circumhorizontal arc".
- Circumhorizontal_arc label "Zirkumhorizontalbogen".
- Circumhorizontal_arc label "Łuk okołohoryzontalny".
- Circumhorizontal_arc label "Округло-горизонтальная дуга".
- Circumhorizontal_arc label "火彩虹".
- Circumhorizontal_arc label "環水平アーク".
- Circumhorizontal_arc sameAs Zirkumhorizontalbogen.
- Circumhorizontal_arc sameAs Arco_circunhorizontal.
- Circumhorizontal_arc sameAs Arku_zirkunhorizontal.
- Circumhorizontal_arc sameAs Arc_circumhorizontal.
- Circumhorizontal_arc sameAs 環水平アーク.
- Circumhorizontal_arc sameAs Łuk_okołohoryzontalny.
- Circumhorizontal_arc sameAs Arco_circum-horizontal.
- Circumhorizontal_arc sameAs m.0d_0m7.
- Circumhorizontal_arc sameAs Q205897.
- Circumhorizontal_arc sameAs Q205897.
- Circumhorizontal_arc sameAs Circumhorizontal_arc.
- Circumhorizontal_arc wasDerivedFrom Circumhorizontal_arc?oldid=603037066.
- Circumhorizontal_arc depiction SunArcs2011Oregon.png.
- Circumhorizontal_arc isPrimaryTopicOf Circumhorizontal_arc.
