Definition of plasmasphere in English:

plasmasphere

noun

Astronomy
  • The roughly toroidal region surrounding and thought to rotate with the earth (or another planet) at latitudes away from the poles, containing a relatively dense plasma of low-energy electrons and protons.

    • ‘The arm of the plasmasphere pointing toward the Sun, on the lower right, was hypothesized but never before seen directly.’
    • ‘This region is normally shielded by the Earth's plasmasphere, but during the particularly intense solar storms last year, this was eroded somewhat and the ‘safe-zone’ was flooded with ions.’
    • ‘The story of the plasmasphere discovery started out as anecdotal.’

Pronunciation:

plasmasphere

/ˈplazməsfiːə/