ionopause

ionopause

[ahy-on-uh-pawz]
noun
the transitional zone between the ionosphere and the mesosphere.

Origin:
iono- + pause

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World English Dictionary
ionopause (aɪˈɒnəˌpɔːz)
 
n
the transitional zone in the atmosphere between the ionosphere and the exosphere, about 644 km (400 miles) from the earth's surface

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