Measured fields and earth potentials at 10 and 20 meters from the base of triggered lightning channels
Conference
·
OSTI ID:10134326
Vertical electric fields, azimuthal magnetic fields, and earth voltages developed over a 0.5-m radial step distance have been measured at 10 and 20 m from the ground attachment point of triggered lightning. The magnetic fields are found to follow Ampere`s law closely, in both amplitude and waveform. The relationship between maximum vertical electric field change due to a descending dart leader and the peak of its associated return-stroke current is linear. Recorded earth step voltages have the same waveforms as the incident return-stroke currents and, for distances between 10 and 20 m from the strike point, their amplitudes exhibit a 1/r dependence. Statistics are given on the observed occurrence of radial surface ground arcs emanating from the earth attachment point as a function of peak incident return-stroke current.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States); Department of Defense, Washington, DC (United States)
- DOE Contract Number:
- AC04-94AL85000
- OSTI ID:
- 10134326
- Report Number(s):
- SAND--93-2735C; CONF-940980--1; ON: DE94008453; BR: GB0103012
- Country of Publication:
- United States
- Language:
- English
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