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CIRCUMZENITHAL 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
- circumzenithal arc
1, record 1, English, circumzenithal%20arc
correct
Record 1, Abbreviations, English
Record 1, Synonyms, English
Record 1, Textual support, English
Record number: 1, Textual support number: 1 DEF
Photometeor consisting of a luminous arc of a circle situated in a horizontal plane and centred at the zenith. 2, record 1, English, - circumzenithal%20arc
Record number: 1, Textual support number: 1 OBS
It sometimes happens that circumzenithal arcs are seen when the large halo is not visible. 2, record 1, English, - circumzenithal%20arc
Record number: 1, Textual support number: 2 OBS
It is produced by the refraction of light through the 90° prisms of ice crystals, having entered through the horizontal bases and passed out through the vertical sides. Normally, the crystals are large, oriented, hexagonal plates. The circumzenithal arc is the high sky counterpart of the circumhorizontal 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 majority of circumzenithal arcs are short-lived, short in length and faint or moderately bright. However, very colorful circumhorizontal arcs can occur when the refraction is close to the minimum angle of deviation, corresponding to a solar elevation angle of about 22°. 3, record 1, English, - circumzenithal%20arc
Record 1, French
Record 1, Domaine(s)
- Phénomènes météorologiques, climatiques et atmosphériques
Record 1, Main entry term, French
- arc circumzénithal
1, record 1, French, arc%20circumz%C3%A9nithal
correct, masculine noun
Record 1, Abbreviations, French
Record 1, Synonyms, French
Record 1, Textual support, French
Record number: 1, Textual support number: 1 DEF
Photométéore consistant en un arc de cercle lumineux situé dans un plan horizontal et centré au zénith. 2, record 1, French, - arc%20circumz%C3%A9nithal
Record number: 1, Textual support number: 1 CONT
L'arc circumzénithal est moins fréquent, car il n'apparaît que si la hauteur du soleil au-dessus de l'horizon est inférieure à 32,2 degrés. Cet arc est formé quand la lumière solaire entre dans le cristal par la face horizontale supérieure et en ressort par une face latérale verticale. Quand le soleil est au-dessus de 32,2 degrés, la lumière est entièrement réfléchie à l'intérieur du cristal; c'est pourquoi on ne voit cet arc que lorsque le Soleil est relativement bas sur l'horizon. À 32,2 degrés, la lumière ressort du cristal verticalement vers le bas; on verra alors l'arc circumzénithal comme un point éclatant au zénith. À mesure que le soleil descend (se couche), le point se déploie pour former un arc de cercle coloré et centré au zénith face au soleil. Pour être bien technique, lorsque le soleil est à 22,1 degrés, l'éclat de l'arc est à son maximum et il est tangent au grand halo. 3, record 1, French, - arc%20circumz%C3%A9nithal
Record number: 1, Textual support number: 1 OBS
Il arrive parfois que l'on observe les arcs circumzénithaux sans que le grand halo soit visible. 2, record 1, French, - arc%20circumz%C3%A9nithal
Record 1, Spanish
Record 1, Campo(s) temático(s)
- Fenómenos meteorológicos, climáticos y atmosféricos
Record 1, Main entry term, Spanish
- arco circumcenital
1, record 1, Spanish, arco%20circumcenital
masculine noun
Record 1, Abbreviations, Spanish
Record 1, Synonyms, Spanish
Record 1, Textual support, Spanish
Record number: 1, Textual support number: 1 DEF
Fotometeoro formado por un arco de un círculo luminoso situado en un plano horizontal y concéntrico con el cenit. 1, record 1, Spanish, - arco%20circumcenital
Record number: 1, Textual support number: 1 OBS
A veces ocurre que se ven los arcos circumcenitales cuando no es visible el halo grande. 1, record 1, Spanish, - arco%20circumcenital
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