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La pagina facebook di MeteoSvizzera ha anche lanciato un contest fotografico: chi posterà la foto più bella del "parelio" verificatosi sabato, avrà l'onore di vedere il proprio scatto utilizzato come immagine di copertina della loro pagina.
Ma di che si tratta? Il parelio è un fenomeno ottico atmosferico che produce macchie luminose e colorate nel cielo, ed è causato dalla rifrazione della luce da parte dei cristalli di ghiaccio sospesi nell'atmosfera che solitamente costituiscono i cirri, ovvero nuvole d'alta quota.
In alcuni casi fortunati, il Sole può apparire accompagnato da altri due suoi doppioni. Per questo il fenomeno è stato chiamato anche "Cani del Sole".
Entra nel canale WhatsApp RSI Info
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