[ahy-on-uh-pawz] /aɪˈɒn əˌpɔz/

the transitional zone between the ionosphere and the mesosphere.
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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  • Ionophoresis

    ionophoresis i·on·o·pho·re·sis (ī-ŏn’ə-fə-rē’sĭs) n. See electrophoresis. i·on’o·pho·ret’ic (-rět’ĭk) adj.

  • Ionosonde

    [ahy-on-uh-sond] /aɪˈɒn əˌsɒnd/ noun 1. a pulsed radar device used to measure the height of ionospheric layers.

  • Ionosphere

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