© Paula de Diaz
Totoras, Santa Fe, Argentina
Latitude: 32° 35' 15'' S
Longitude: 61° 9' 39'' W
09 December 2016 1138 (Local Time)
Image P/S code: P.13.1.5.2
Image I.D.: 5180
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Circumhorizontal arc
The circumhorizontal arc is a fairly flat arc of spectral colours that occurs low in the sky, near to the horizon. It is formed by the refraction of sunlight through the ice crystals in high-level cloud, such as Cirrus, but it only occurs when the elevation of the light source (for example, the Sun) is greater than 58°. Red is always uppermost and the violet part of the spectrum is nearest the horizon.
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© Paula de DiazTotoras, Santa Fe, ArgentinaLatitude: 32° 35' 15'' SLongitude: 61° 9' 39'' W09 December 2016 1138 (Local Time)Image P/S code: P.13.1.5.2Image I.D.: 5180
Circumhorizontal arc
This photograph shows a close-up view of part of a circumhorizontal arc that formed by the refraction of sunlight through the ice crystals in a Cirrus cloud. Some Cumulus cloud also appears in the picture.
The circumhorizontal arc occurs when the elevation of the Sun is more than 58°. It appears as an arc of spectral colours near and roughly parallel to the horizon, with red always uppermost and violet nearest the horizon.
Links in the image description will highlight features on the image. Mouse over the features for more detail.
© Javier Ceberio GarcíaCasco Histórico de Vallecas, Madrid, SpainLatitude: 40° 21' 49'' NLongitude: 3° 36' 15'' W25 May 2014 1525 (Local Time)Camera direction: towards SWImage P/S code: S.13.1.5.2Image I.D.: 4974
Circumhorizontal arc
This photograph shows a partial circumhorizontal arc that formed by the refraction of sunlight through the ice crystals in a Cirrus cloud (possibly a diffused contrail).
Circumhorizontal arcs have a large radius, so they are effectively flat, and are located low in the sky, roughly parallel with the horizon. They only occur when the Sun is high in the sky at an elevation of greater than 58°. The spectral colours are such that red is always uppermost and blue/violet is always nearest the horizon.
Links in the image description will highlight features on the image. Mouse over the features for more detail.
© Cho Ming ChengCentre Ville, Cannes, FranceLatitude: 43° 33' 10'' NLongitude: 7° 1' 3'' E26 May 2004 1237 (Local Time)Image P/S code: S.13.1.5.2Image I.D.: 5086