Discussion
The potential of the electrosphere (ionosphere) is positive with respect the Earth and its magnitude is about :
Answer: C
The ionosphere's potential relative to the earth is about 300 kV.
In the global atmospheric electric circuit, thunderstorms act as generators that charge the upper atmosphere (the electrosphere) positively with respect to the ground. The resulting potential difference is about 250-300 kV, which drives a small fair-weather current downwards and produces the surface electric field of about 100 V/m.
1000 kV and 2000 kV are several times too large, and 10 kV is far too small for this ionospheric potential.
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