Definition of geospace
: the combined area of the earth's upper atmosphere and nearby outer space The term geospace was coined recently to describe the ensemble of separate regions close to the Earth and traditionally called the atmosphere, ionosphere, magnetosphere, … and solar wind.— M. J. Rycroft et al. The geospace environment is controlled largely by events on the Sun, such as solar flares and coronal mass ejections, which generate significant geomagnetic and upper atmospheric disturbances.— N. A. Gross et al.
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