Time domain simulations of preliminary breakdown pulses in natural lightning
| Autor: | Hugh J. Christian, Brant Carlson, Phillip M. Bitzer, Can Liang |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Physics
Atmospheric Science Mathematics and natural scienses: 400::Physics: 430::Space and plasma physics: 437 [VDP] FOS: Physical sciences Matematikk og naturvitenskap: 400::Fysikk: 430::Rom- og plasmafysikk: 437 [VDP] Charge (physics) Mechanics Method of moments (statistics) Electric-field integral equation Lightning Space Physics (physics.space-ph) Pulse (physics) Geophysics Orders of magnitude (time) Physics - Space Physics 13. Climate action Space and Planetary Science Physics::Plasma Physics Preliminary Breakdown Earth and Planetary Sciences (miscellaneous) Time domain Research Articles Simulation Communication channel |
| Zdroj: | Journal of Geophysical Research. Atmospheres |
| Popis: | Lightning discharge is a complicated process with relevant physical scales spanning many orders of magnitude. In an effort to understand the electrodynamics of lightning and connect physical properties of the channel to observed behavior, we construct a simulation of charge and current flow on a narrow conducting channel embedded in three-dimensional space with the time domain electric field integral equation, the method of moments, and the thin-wire approximation. The method includes approximate treatment of resistance evolution due to lightning channel heating and the corona sheath of charge surrounding the lightning channel. Focusing our attention on preliminary breakdown in natural lightning by simulating stepwise channel extension with a simplified geometry, our simulation reproduces the broad features observed in data collected with the Huntsville Alabama Marx Meter Array. Some deviations in pulse shape details are evident, suggesting future work focusing on the detailed properties of the stepping mechanism. Key Points Preliminary breakdown pulses can be reproduced by simulated channel extension Channel heating and corona sheath formation are crucial to proper pulse shape Extension processes and channel orientation significantly affect observations |
| Databáze: | OpenAIRE |
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