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En los confines del Círculo Ártico, nubarrones multicolores han iluminado el cielo durante varios días consecutivos. La presencia inusual de estos vibrantes nubarrones durante un período tan prolongado ha capturado la atención de observadores y expertos.
Calificados como nubes estratosféricas polares (PSCs, por sus siglas en inglés), estos espectaculares nubarrones arcoíris han adornado el cielo sobre Noruega, Suecia, Finlandia, Alaska e incluso Escocia. Este fenómeno excepcional comenzó a manifestarse el 18 de diciembre y persistió hasta el 20 de diciembre, según informó Spaceweather.com. Algunas nubes menos distintas fueron avistadas el 21 de diciembre, pero en general, parecen disiparse.
"Los colores son espectaculares", comentó Šapailaitė a Spaceweather.com. "Las nubes eran visibles durante todo el día, pero los colores realmente explotaban justo antes del atardecer."
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La formación de las PSCs se atribuye a un período prolongado de temperaturas inusualmente bajas en la atmósfera superior, según informa Spaceweather.com. Estas nubes están compuestas por diminutos cristales de hielo que refractan o dispersan la luz solar, creando el efecto arcoíris que observamos desde la Tierra.
Existen dos tipos de PSCs: Tipo I, compuestas por una mezcla de cristales de hielo y ácido nítrico, que producen colores menos espectaculares y están vinculadas a la formación de agujeros de ozono; y Tipo II, formadas por cristales de hielo puro que generan colores más vívidos. Las nubes que se formaron recientemente sobre el Ártico pertenecen al Tipo II.
La reciente aparición de nubarrones arcoíris sobre el Ártico ha sido un fenómeno celestial extraordinario. Las condiciones atmosféricas excepcionales, combinadas con la habilidad artística de fotógrafos como Ramunė Šapailaitė, nos han permitido contemplar la belleza efímera de estas nubes nacaradas. Continuaremos atentos a los cielos, ya que la posibilidad de avistamientos adicionales durante los próximos meses sigue latente.
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