When solar activity is high, solar extreme ultraviolet rays warm and expand the thermosphere.

当太阳活动剧烈时, 太阳极端的紫外线会加热并使热大气层扩张.

期刊摘选

The temperature rises rapidly to between 500 k and 2000 k in the region known as the thermosphere.

在称之为“热层”地区域内,温度很快上升到500K与2000K之间.

辞典例句

After the thermosphere is the thermopause, which is the outer most boundary of the thermosphere.

热成层之后是热成层顶, 它是热成层的最外边界.

期刊摘选