Influence of Channel Base Current and Varying Return Stroke Speed on the Calculated Fields of Three Important Return Stroke Models
- Univ. of Florida, Gainesville, FL (United States)
- Technical Univ. of Vienna (Austria)
Recently Nucci et al. compared five return stroke models using an identical current at the chemical base of each. Diendorfer and Uman introduced a new model which reproduces remarkably well the experimentally observed characteristics of the fields both close to and far from the return stroke channel. Both Nucci et al. and Diendorfer and Uman used a channel base current that is typical of measured subsequent stroke current of both natural lightning and triggered lightning. Though the channel base current adopted in each paper is within the range of measured currents, they differ in the detailed wave shape. The first part of this paper compares the calculated fields of the Traveling Current Source (TCS), Modified Transmission Line (MTL), and the Diendorfer-Uman (DU) models with a channel base current assumed in Diendorfer and on the hand and with the channel base current assumed in Nucci et al. on the one hand and with the channel base current assumed in Diendorfer and Uman on the other hand. The characteristics of the field wave shapes are shown to be very sensitive to the channel base current, especially the field zero crossing at 100 km for the TCS and DU models, and the magnetic hump after the initial peak at close range for the TCS model. In the second part of the paper the DU model is theoretically extended to include any arbitrarily varying return stroke speed with height and a brief discussion is presented of the effects of an exponentially decreasing speed with height on the calculated fields for the TCS, MTL, and DU models.
- Research Organization:
- Univ. of Florida, Gainesville, FL (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE; National Science Foundation (NSF)
- DOE Contract Number:
- AC05-84OR21400; 19X-89650C; ATM 8807449
- OSTI ID:
- 6079579
- Report Number(s):
- CONF-9104163-4; ON: DE91010786; CNN: ATM 8807449
- Resource Relation:
- Conference: 1991 International Conference on Lightning and Static Electricity, Cocoa Beach, FL (United States), 16-19 Apr 1991
- Country of Publication:
- United States
- Language:
- English
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