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BANDA VISIBLE [2 records]

Record 1 2011-07-08

English

Subject field(s)
  • Atmospheric Physics
  • Scientific Measurements and Analyses
  • The Sun (Astronomy)
DEF

Intensity of solar radiation on a surface normal to and exposed to the sun, and located outside the earth's atmosphere at a distance from the sun equal to the earth's mean distance from the sun.

OBS

The currently accepted value is 1353 W/m², or 429.2 Btu/hft².

OBS

Its current value is 1.37 kW per m². It is not, in fact, truly constant, and variations of order 0.1% are detectable.

French

Domaine(s)
  • Physique de l'atmosphère
  • Mesures et analyse (Sciences)
  • Soleil (Astronomie)
DEF

Quantité de rayonnement solaire reçue, par unité d'aire et de temps, sur une surface perpendiculaire aux rayons et située à la limite extérieure de l'atmosphère terrestre lorsque la Terre est à sa distance moyenne du Soleil.

OBS

Elle vaut 1,98±0,05·104 calories par minute, soit 1,35 kW·m-² en unités S.I.

OBS

Sa valeur moyenne est voisine de 1370 W.m-2 (environ 2 cal.cm-2.min-1).

Spanish

Campo(s) temático(s)
  • Física de la atmósfera
  • Medición y análisis (Ciencias)
  • Sol (Astronomía)
DEF

Cantidad de energía térmica solar que llega al límite superior de la baja atmósfera.

CONT

La constante solar(Gsc), es el flujo de energía proveniente del Sol, que incide sobre una superficie perpendicular a la dirección de propagación de la radiación solar, ubicada a la distancia media de la Tierra al Sol, fuera de toda atmósfera. Esta energía corresponde a una radiación electromagnética formada por distintas longitudes de onda(espectro solar) agrupadas en tres bandas : ultravioleta(UV), visible e infrarrojo(IR). Cada banda transporta una cantidad de energía determinada, siendo a este respecto las más importantes el visible y el IR.

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Record 2 2005-07-25

English

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

Violet-pink band which separates the Earth's shadow from a purple light which appears in the direction opposite to that of the Sun and which progressively descends below the horizon.

OBS

The antitwilight arch rises with the antisolar point at sunset and sets with the antisolar point at sunrise. The antitwilight arch is brighter than the bluish gray dark segment beneath it. The boundary between these features may be distinct shortly after sunset (sun elevation h0 -2°), but it fades as evening twilight progresses.

French

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

Bande rose-violet qui sépare l'ombre de la Terre d'une lueur pourpre qui apparaît dans la direction opposée à celle du Soleil et qui descend progressivement au-dessous de l'horizon.

CONT

La partie sombre entre l'horizon et le ciel rose s'appelle l'arche anticrépusculaire, et n'est rien d'autre que l'ombre de la Terre une fois le soleil couché.

Spanish

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

Banda rosa violácea que separa la sombra de la Tierra de la luz púrpura, visible en dirección opuesta a la del Sol y que desciende progresivamente por debajo del horizonte.

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