Definition of ionopause in English:

ionopause

noun

Astronomy
  • The upper boundary of the ionosphere of a planet, comet, or other celestial object.

    • ‘The dayside ionopause and ionosphere are observed to respond dramatically to solar wind pressure variations’
    • ‘The pressure distribution within the magnetic barrier just outside the ionopause of Venus is shown here to be similar to expected solar wind pressure variation.’

Pronunciation:

ionopause

/ʌɪˈɒnə(ʊ)pɔːz/