The Earth's Electrical Environment (1986) / Chapter Skim
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Pages 32-35
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From page 32... ...
These are described briefly, and their importance is indicated. First, we discuss how remote measurements of electric and magnetic fields can be used to infer properties of lightning currents, including some implications of recent measurements.
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From page 33... ...
For example, there are now large networks of magnetic directionfinders that can discriminate between the shapes of the return-stroke fields and other processes and that can provide accurate locations of the ground-strike points (see Chapters 1 and 5, this volume; Krider et al., 1980~. In a series of recent papers, Uman and co-workers have developed a theoretical model that describes the shapes of the electric and magnetic fields that are pro duced by return strokes at various distances (Uman et al., 1975; Master et al., 1981; Uman and Krider, 1982~.
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From page 34... ...
= - 21l° D I(t - Dlc) , where E is the vertical electric field that is measured at the ground at time t, ,uO the permeability of free space, v the return stroke velocity, c the speed of light, and D the horizontal distance to the flash.
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From page 35... ...
Measurements of the maximum dEIdis that are radi ated by return strokes striking seawater are summarized in Figure 2.8. Here, the average maximum dE/dt is about 33 V/m/,usec when the values are range-normal ized to 100 km using an inverse distance relation.
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