
16/05/2025
An aurora is a natural light display in the sky (from the Latin word aurora, "sunrise" or the Roman goddess of dawn), predominantly seen in the high latitude (Arctic and Antarctic) regions.
Aurorae are caused by cosmic rays, solar wind and magnetospheric plasma interacting with the upper atmosphere (thermosphere/exosphere). Their charged particles, mainly electrons and protons, enter the atmosphere from above causing ionization and excitation of atmospheric constituents, and consequent light emissions. Incident protons can also produce emissions as hydrogen atoms after gaining an electron from the atmosphere................................................
L’aurora polare, spesso denominata aurora boreale o australe a seconda dell'emisfero in cui si verifica, è un fenomeno ottico dell'atmosfera terrestre, caratterizzato principalmente da bande luminose di un'ampia gamma di forme e colori rapidamente mutevoli nel tempo e nello spazio, tipicamente di colore rosso-verde-azzurro detti archi aurorali.............................................
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