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CIRCUMHORIZONTAL ARC [1 record]
Record 1 - internal organization data 2005-07-25
Record 1, English
Record 1, Subject field(s)
- Atmospheric, Climatic and Meteorological Phenomena
Record 1, Main entry term, English
- circumhorizontal arc
1, record 1, English, circumhorizontal%20arc
correct
Record 1, Abbreviations, English
Record 1, Synonyms, English
Record 1, Textual support, English
Record number: 1, Textual support number: 1 DEF
A halo phenomenon consisting of a coloured arc, red on its upper margin; it extends for about 90° parallel to the horizon and lies about 46° below the Sun [or Moon]. 2, record 1, English, - circumhorizontal%20arc
Record number: 1, Textual support number: 1 OBS
It is produced by the refraction of light through the 90° prisms of ice crystals, having entered through the vertical sides and passing out through the horizontal bases. Normally, the crystals are large, oriented, hexagonal plates. The circumhorizontal arc is the low sky counterpart of circumzenithal arc. The circumhorizontal arc is low in the sky when the sun is high (above 58° elevation); the circumzenithal arc is high in the sky when the sun is low (below 32° elevation). The most colorful circumhorizontal arcs occur when the refraction is close to the minimum angle of deviation, and this corresponds to a solar elevation angle of about 68°. In the midlatitudes, the sun only climbs to that elevation for a few hours mid day around the summer solstice. 3, record 1, English, - circumhorizontal%20arc
Record 1, French
Record 1, Domaine(s)
- Phénomènes météorologiques, climatiques et atmosphériques
Record 1, Main entry term, French
- arc circumhorizontal
1, record 1, French, arc%20circumhorizontal
correct, masculine noun
Record 1, Abbreviations, French
Record 1, Synonyms, French
Record 1, Textual support, French
Record number: 1, Textual support number: 1 DEF
Phénomène de halo consistant en un arc coloré, rouge à son extrémité supérieure; il s'étend sur environ 90° parallèlement à l'horizon, à 46° au-dessous du Soleil. 2, record 1, French, - arc%20circumhorizontal
Record number: 1, Textual support number: 1 CONT
Quand le Soleil est assez haut dans le ciel (de 32° à 90° de hauteur de l'horizon) un arc circumhorizontal peut être visible sous le Soleil près de l'horizon lors de passage de cirrus. Ces arcs ont la forme inverse à l'arc circumzénithal, sont assez grands et sont produits par les cristaux plats. Ces arcs sont parmi les moins visibles. [...] Plus on est en basse latitude plus on a la chance de [les] voir [...] Ils ne peuvent pas être visibles quand on monte au-delà de 55° de latitude [...] Vers le nord de la France ou en Allemagne à 50° de latitude, l'arc circumhorizontal n'est visible qu'une fois en été [...] C'est un des [...] arcs à ne pas être visible partout sur Terre. 3, record 1, French, - arc%20circumhorizontal
Record 1, Spanish
Record 1, Campo(s) temático(s)
- Fenómenos meteorológicos, climáticos y atmosféricos
Record 1, Main entry term, Spanish
- arco circumhorizontal
1, record 1, Spanish, arco%20circumhorizontal
correct, masculine noun
Record 1, Abbreviations, Spanish
Record 1, Synonyms, Spanish
Record 1, Textual support, Spanish
Record number: 1, Textual support number: 1 DEF
Halo que consta de un arco coloreado con el rojo en su lado superior. Este arco se extiende alrededor de 90° paralelo al horizonte en una altura de aproximadamente 46° por debajo del Sol. 1, record 1, Spanish, - arco%20circumhorizontal
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