Discussion
................................ maintains the ionospheric potential (Vi) of approximately ~ + 300 kV with respect to the Earth surface.
Answer: C
The ionospheric potential is maintained by thunderstorm and lightning activity.
In the global electric circuit, the roughly 2,000 thunderstorms active at any moment act as generators. They carry positive charge upward to the ionosphere and negative charge to the ground (largely through lightning), keeping the ionosphere at about +250 to +300 kV relative to the Earth. This drives a weak fair-weather current downward everywhere else, which would otherwise discharge the system within minutes.
Monsoon rain, cyclones and anticyclones, and earthquakes and tsunamis do not act as charge separators on the global scale needed to sustain this potential.
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