Electric Power Generation, Transmission, and Distribution

four ground models for this 2400 nT=min B field disturbance. As expected, the Ground C model
produces the largest geoelectric field reaching a peak of15 V=km, whereas Ground A is next largest
and the Ground B model produces the smallest geoelectric field response. The Ground C geoelectric field
peak is more than six times larger than the peak geoelectric field for the Ground B model. It is also

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0

500

1000

1500

2000

2500 B Field disturbance—2400 nT/min electrojet

B Intensity (nT)

Time (mm:ss)

FIGURE 16.9 Waveform of example electrojet-driven geomagnetic field disturbance with 2400 nT=min rate of
change intensity.

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− 2

0

2

4

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8

10

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16

18

Geoelectric field response—2400 nT/min electrojet

Ground A

Ground B

Ground C

V/km Ground D

Time (mm:ss)

FIGURE 16.10 Geoelectric field response of the four example ground models to the 2400 nT=min disturbance
conditions of Fig. 16.3.