In situ measurements of contributions to the global electrical circuit by a thunderstorm in southeastern Brazil
Atmospheric Research
By: J.N. Thomas, R.H. Holzworth, and M.P. McCarthy
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Abstract
The global electrical circuit, which maintains a potential of about 280??kV between the earth and the ionosphere, is thought to be driven mainly by thunderstorms and lightning. However, very few in situ measurements of electrical current above thunderstorms have been successfully obtained. In this paper, we present dc to very low frequency electric fields and atmospheric conductivity measured in the stratosphere (30-35??km altitude) above an active thunderstorm in southeastern Brazil. From these measurements, we estimate the mean quasi-static conduction current during the storm period to be 2.5 ?? 1.25??A. Additionally, we examine the transient conduction currents following a large positive cloud-to-ground (+ CG) lightning flash and typical - CG flashes. We find that the majority of the total current is attributed to the quasi-static thundercloud charge, rather than lightning, which supports the classical Wilson model for the global electrical circuit.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | In situ measurements of contributions to the global electrical circuit by a thunderstorm in southeastern Brazil |
| Series title | Atmospheric Research |
| DOI | 10.1016/j.atmosres.2008.03.026 |
| Volume | 91 |
| Issue | 2-4 |
| Year Published | 2009 |
| Language | English |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Atmospheric Research |
| First page | 153 |
| Last page | 160 |
| Google Analytic Metrics | Metrics page |