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altostratus

Overview page. Subjects: Environmental Science — Earth Sciences and Geography.

From the Latin altum (height) and stratus (spread out). A genus of cloud consisting of greyish sheets or layers; the cloud may be striated, fibrous, or uniform. It may be composed of ice...

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anthelic arc

Overview page. Subjects: Meteorology and Climatology.

A halo phenomenon consisting of a white arc that is visible on the opposite side of the sky to the Sun, and which is probably created by a single internal reflection within ice crystals....

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anthelion

Overview page. Subjects: Meteorology and Climatology.

The point in the sky directly opposite the Sun.

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arc of contact

Overview page. Subjects: Meteorology and Climatology.

A halo phenomenon that consists of an arc (or arcs) tangent to the 22° halo. The form varies with solar elevation. At low elevations, both upper and lower contact arcs are convex towards...

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arcs of Lowitz

Overview page. Subjects: Meteorology and Climatology.

A rare halo phenomenon, normally appearing as parabolic arcs convex towards the Sun and tangent to the 22° halo at points below the position of any parhelion. The theoretical explanation is...

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atmospheric optics

Overview page. Subjects: Meteorology and Climatology.

The various optical phenomena that occur in the atmosphere and arise through diffraction, reflection, refraction, and scattering. These include glories, haloes, iridescence, mirages,...

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Bouguer's halo

Overview page. Subjects: Meteorology and Climatology.

A rare optical phenomenon, consisting of a white circle or arc, centred on the antisolar point, and with a reported radius of approximately 33.5°. It is not known whether this is a true...

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circumhorizontal arc

Overview page. Subjects: Meteorology and Climatology.

An occasionally spectacular halo phenomenon that consists of a brilliantly coloured arc lying parallel to the horizon and sometimes extending for as much as 120°. It arises from refraction...

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circumzenithal arc

Overview page. Subjects: Meteorology and Climatology.

A halo phenomenon, consisting of a short arc, showing brilliant spectral colours, centred on the zenith, and normally symmetrical about the line joining the Sun and zenith. It arises from...

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cirrostratus

Overview page. Subjects: Environmental Science — Earth Sciences and Geography.

Cloud genus comprising a semi-transparent veil of fibrous or smooth appearance, often covering the sky, and identified by halo phenomena. When associated with a cold front, the cloud sheets...

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