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The solar wind, magnetosphere, and ionosphere form a vast multi-scale system.
Global thunderstorm activity maintains a variable potential difference … of the order of 250 kV between the quasi-equipotentials of the lower … reaches of the ionosphere and the Earth.
Variations in the atmospheric, near-surface vertical electric field component Ez measured at the Russian Antarctic station Vostok in 1998 are analyzed in conjunction with changes of the interplanetary magnetic field (IMF).
Vertical geoelectric eld measurements at Vostok,Antarctica (78:5ºS ;107ºE;corrected geomagnetic latitude,83:4ºS) made during 1998 are compared with both Weimer (1996)and IZMEM (1994)model calculations of the solar-wind-induced, polar-cap potential di erences with respect to the station.