TERMIUM Plus^®

Record 1,  Textual support,  English

Record number: 1, Textual support number: 1 CONT

The above photo shows a halo phenomenon known as the upper tangent arc. When cirrus clouds contain columnar ice crystals aligned so that their axes are all in a horizontal direction, this type of arc may be produced. A characteristic of this arc-shaped patch of light is that it's directly above the Sun(it bends upward away from the Sun), and it's approximately 22 degrees away from the Sun itself-about 2 fists held at arms length.  1, record 1, English, - upper%20tangent%20arc

Record number: 1, Textual support number: 2 CONT

The 22° halo is most common, but other halo forms are sometimes seen. The tangent arcs to the 22° halo can appear if the sun’s declination is less than 32°. One is called the lower tangent arc to the 22° halo, and the other is the upper tangent arc to the 22° halo. The shape of these tangent haloes depends upon the sun’s declination. If the sun is close to the horizon, the two upper arcs angle sharply away from the 22° halo. As the sun rises higher in the sky, the tangent arcs move toward the 22° halo. When the sun’s declination reaches 32°above the horizon, the lower and upper tangent arcs make contact, and the resulting ring is called the circumscribed halo. It touches the 22° halo above and beneath the sun. When the sun is just above 32°the circumscribed halo resembles a double oval. As the sun rises higher it becomes increasingly circular and draws nearer to the 22° halo. When the sun’s declination exceeds 70°, the circumscribed arc nearly coincides with the 22° halo.  2, record 1, English, - upper%20tangent%20arc

Record 1,  Textual support,  French

Record number: 1, Textual support number: 1 CONT

Un peu au-dessus ou au-dessous de l'astre lumineux [soleil], à la distance de 22 degrés, on peut fréquemment voir des arcs supérieurs et inférieurs tangents au petit anneau. En fait, on observe plus souvent les arcs supérieurs; ils ont souvent de belles couleurs. [...] Sur l'image suivante, on voit un arc tangent supérieur.  2, record 1, French, - arc%20tangent%20sup%C3%A9rieur

Record 1,  Textual support,  Spanish

Record 2,  Textual support,  English

Record number: 2, Textual support number: 1 DEF

White, or mostly white, luminous ring of 22° radius with the luminary at its centre, showing a faint red fringe on the inside and, rarely, a violet fringe on the outside.  3, record 2, English, - small%20halo

Record number: 2, Textual support number: 1 CONT

A small halo of 22 degrees(about the width of an outstretched hand at arm's length) is most common, while a large halo of 46 degrees is less frequently seen.  2, record 2, English, - small%20halo

Record number: 2, Textual support number: 1 OBS

The portion of the sky inside the ring is conspicuously darker than the rest of the sky.  3, record 2, English, - small%20halo

Record 2,  Textual support,  French

Record number: 2, Textual support number: 1 DEF

Anneau lumineux, blanc ou en majeure partie blanc, de 22° de rayon et centré sur l'astre éclairant.  2, record 2, French, - petit%20halo

Record number: 2, Textual support number: 1 OBS

[Le petit halo] présente sur son bord intérieur une frange rouge peu visible et, dans quelques rares cas, une frange violette sur son bord extérieur. La partie du ciel située à l'intérieur de l'anneau est nettement plus sombre que le reste du ciel.  2, record 2, French, - petit%20halo

Record 2,  Textual support,  Spanish

Record number: 2, Textual support number: 1 DEF

Anillo luminoso, blanco o blanquecino, cuyo radio es de 22° concéntrico con la fuente luminosa.  1, record 2, Spanish, - halo%20peque%C3%B1o

Record number: 2, Textual support number: 1 OBS

El halo pequeño muestra en su interior una franja roja débil y en algunas ocasiones una franja violeta exterior. La región del cielo interior al anillo es notablemente más oscura que el resto del cielo.  1, record 2, Spanish, - halo%20peque%C3%B1o