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Pages 6-7

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From page 6...
... Ever since the 1920s, thunderstorms have been identified to be the dominant generator in the global circuit. Most cloud-to-ground lightning transfers negative charge to the ground, and the point discharge currents under a storm transfer positive space charge to the atmosphere.
From page 7...
... There is a need for further measurements to quantify the relationships between diurnal variations of the ionospheric potential, the electric field or air-earth current, and worldwide estimates of thunderstorm frequency. Many electrical processes interact within the global circuit, and the following subsections will describe selected processes that occur within certain atmospheric regions (Figure 3~.


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