aurora bo·re·al·is 
(bôr′ē-ălĭs)
(bôr′ē-ălĭs)n. pl. aurora bo·re·al·is·es (-ĭ-sĭz) or aurorae borealis
An aurora that occurs in northern regions of the earth. Also called northern lights.
[New Latin aurōra boreālis : Latin aurōra, dawn + Latin boreālis, northern.]
aurora borealis