Secondary Fast Breakdown in Narrow Bipolar Events.

Area of Science:

• Atmospheric physics
• Electromagnetism
• Plasma physics

Background:

• Narrow bipolar events (NBEs) are complex electrical discharges in the atmosphere.
• The physical mechanisms behind NBEs, particularly secondary breakdown, remain incompletely understood.
• Existing electromagnetic models have not fully explained the observed secondary fast breakdown in NBEs.

Purpose of the Study:

• To investigate the physics of fast breakdown discharges that generate NBEs.
• To develop and validate a new electromagnetic model that accounts for secondary fast breakdown.
• To provide new insights into the underlying physical mechanisms of NBEs.

Main Methods:

• Utilized the Modified Transmission Line with Exponential decay (MTLE) model.
• Developed a novel
• rebounding MTLE model
• to simulate secondary breakdown phenomena.

Main Results:

• The proposed rebounding MTLE model successfully reproduces the secondary fast breakdown current observed in NBEs.
• The model offers a plausible explanation for the reverse propagation of breakdown.

Conclusions:

• The rebounding MTLE model provides a significant advancement in understanding NBE physics.
• This new model enhances our ability to simulate and interpret complex atmospheric electrical phenomena.