ionopause

[ ahy-on-uh-pawz ]
/ aɪˈɒn əˌpɔz /

noun

the transitional zone between the ionosphere and the mesosphere.

Origin of ionopause

British Dictionary definitions for ionopause

ionopause
/ (aɪˈɒnəˌpɔːz) /

noun

the transitional zone in the atmosphere between the ionosphere and the exosphere, about 644 km (400 miles) from the earth's surface