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ARCO TANGENTE HALO 22 [2 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2005-07-25

English

Subject field(s)
  • Atmospheric, Climatic and Meteorological Phenomena
DEF

tangent arcs to 22° halo: Luminous arcs tangential to the summit or base of a small halo (22°); their shape vary greatly with the height of the luminary (Sun or Moon) above the horizon.

OBS

tangent arc to 22° halo: term frequently used in the plural (tangent arcs to 22° halo).

Key term(s)
  • tangent arcs to 22° halo
  • tangent arc to the 22 degree halo
  • 22° tangent arcs
  • 22° tangent arc
  • tangent arcs to the 22 degree halo
  • twenty-two degree tangent arc
  • twenty-two degree tangent arcs

French

Domaine(s)
  • Phénomènes météorologiques, climatiques et atmosphériques
DEF

Arc lumineux, tangent au sommet ou à la base d'un petit halo de 22° et dont la forme varie beaucoup suivant la hauteur de l'astre (Soleil ou Lune) au-dessus de l'horizon.

OBS

arc tangent au halo de 22°: terme fréquemment utilisé au pluriel (arcs tangents au halo de 22°).

Key term(s)
  • arcs tangents au halo de 22°

Spanish

Campo(s) temático(s)
  • Fenómenos meteorológicos, climáticos y atmosféricos
DEF

Arco luminoso tangente a la cima o a la base del halo pequeño(22°). Sus formas varían considerablemente según la altura de la fuente luminosa(el Sol o la Luna) sobre el horizonte.

Key term(s)
  • arcos tangentes al halo de 22°
Save record 1

Record 2 2004-09-13

English

Subject field(s)
  • Atmospheric, Climatic and Meteorological Phenomena
DEF

An arc of light tangent to a halo. It forms by refraction of light through ice crystals.

CONT

A tangent arc is a patch of bright light that is occasionally observed along a halo. This occurs when sunlight is refracted by falling hexagonal "pencil-shaped" ice crystals whose long axes are oriented horizontally.

CONT

tangent arcs. ... The most common of these are the upper and lower tangent arcs to the halo of 22°. They form separate arcs when the sun is low, but as the sun climbs they join to produce the circumscribed halo. These arcs are explained by refraction through the 60° prism sides of columnar crystals oriented with their long axes horizontal.

PHR

tangent arc to 22° halo, to 46° halo.

PHR

22° upper, 22° lower, lower, upper tangent arc.

French

Domaine(s)
  • Phénomènes météorologiques, climatiques et atmosphériques
CONT

On répertorie également dans les halos de nombreux phénomènes optiques plus rares. [...] Les arcs tangents sont de courts arcs lumineux partant soit de la base ou du sommet du petit halo, soit (en un couple symétrique) de la demi-circonférence inférieure du grand halo.

PHR

Arc tangent au halo de 22°, au halo de 46°; inférieur, supérieur.

Spanish

Campo(s) temático(s)
  • Fenómenos meteorológicos, climáticos y atmosféricos
PHR

Arco tangente al halo de 22°, al halo de 46°, superior.

Save record 2

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