the upper atmosphere /ˈætməsfɪə/ las capas altas de la atmósfera

the lower atmosphere las capas bajas de la atmósfera

the ecosphere /ˈiːkəʊsfɪə, ˈekəʊ-/ la ecoesfera

the magnetosphere /mægˈniːtəsfɪə/ la magnetosfera

the ozone layer /ˈəʊzəʊn ˌleɪə/ la capa de ozono

the ultraviolet rays /ˌʌltrəvaɪələt ˈreɪz/ los rayos ultravioletas

ultraviolet radiation radiación ultravioleta

the aurora /ɔːˈrɔːrə/ la aurora [general term]: The aurora is a luminous phenomenon occurring in the upper atmosphere.

the aurora borealis (the northern lights) /ɔːˌrɔːrə bɒriˈeɪlɪs/ la aurora boreal: We went to bed with the sight of the aurora borealis shimmering in green waves across the sky.

the aurora australis (the southern lights) /ɔːˌrɔːrə ɒsˈtreɪlɪs/ la aurora austral: They enjoyed the spectacular display of the aurora australis over the Antarctic.