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RAYON ANTI-CREPUSCULAIRE [1 record]

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Record 1 2002-04-09

English

Subject field(s)
  • Atmospheric Physics
DEF

Dark blue bands, shadows of clouds situated on or below the horizon, which ... completely cross the sky and are ... seen near the antisolar point.

OBS

In rare cases "crepuscular rays" extend across the entire sky and "anticrepuscular rays" converge at the point opposite the Sun.

Key term(s)
  • anticrepuscular rays
  • anti-crepuscular rays

French

Domaine(s)
  • Physique de l'atmosphère
CONT

Et les rayons anti-crépusculaires? Ces rayons sont un peu le contraire des [rayons crépusculaires]. En fait, ils prennent leur origine du soleil et traversent le ciel vers l'horizon opposé. On voit le faisceau à cause d'obstacles qui ombragent partiellement le soleil. Ce faisceau semble converger vers le point anti-solaire, i.e. l'endroit sur l'horizon opposé à l'endroit où le soleil se couche. Ils sont, comme les premiers, parallèles, mais ils semblent converger vers le point anti-solaire, encore à cause de l'effet de parallaxe.

Key term(s)
  • rayons anticrépusculaires
  • rayons anti-crépusculaires

Spanish

Campo(s) temático(s)
  • Física de la atmósfera
OBS

Bandas de color azul oscuro que irradian desde el Sol y cruzan la luz púrpura durante el crepúsculo. Están producidas por las sombras de las nubes situadas en o por debajo del horizonte. A veces estas sombras cruzan el cielo por completo y vuelven a ser visibles cerca del punto antisolar (rayos anticrepusculares).

Key term(s)
  • rayos anticrepusculares
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