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L’aurora boreale è stata osservata brevemente in Svizzera nella notte tra domenica e lunedì. Questo fenomeno, raramente visibile alle nostre latitudini, è reso possibile dalla forte attività solare del momento, ha spiegato MeteoSvizzera.
Le luci boreali, chiamate anche “aurore polari”, sono il risultato di un’interazione tra particelle cariche di origine solare provenienti dallo spazio e l’atmosfera terrestre.
In generale, nelle regioni polari l’aurora ha un colore verde chiaro. Tuttavia, quando esse sono generate da una eruzione di massa della corona solare, sopra l’area verde appare anche il rosso. Quando l’aurora si verifica alle medie latitudini, è prodotta solo dalle eruzioni di massa e appare molto bassa sopra l’orizzonte settentrionale. Di conseguenza rimane visibile solo la parte rossa superiore, mentre la frangia verde resta nascosta sotto l’orizzonte.
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