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Area of Science:

  • Physics of electrical discharges
  • Plasma physics
  • Atmospheric electricity

Background:

  • The propagation mechanisms of lightning and long spark leaders are not fully understood.
  • Positive and negative leaders are believed to propagate differently, with positive leaders lacking distinct luminous structures.
  • Recent studies suggest positive leaders might exhibit step-like behavior under specific conditions.

Purpose of the Study:

  • To investigate the propagation characteristics of positive leaders in laboratory lightning-like discharges.
  • To determine if positive leaders can develop step-like propagation guided by luminous structures.
  • To contribute to a deeper understanding of positive long spark and lightning leader physics.

Main Methods:

  • Laboratory experiments simulating lightning-like discharges.
  • High-speed imaging to observe leader propagation and luminous structures.
  • Controlled variation of atmospheric conditions, specifically high humidity.

Main Results:

  • Observation of a positive leader step guided by a separate luminous structure under high humidity.
  • Identification of a streamer-like common zone connecting the leader channel and the luminous structure.
  • Evidence of bi-directional development within the separate luminous structure.

Conclusions:

  • Positive leaders can exhibit step-like propagation, similar to negative leaders, under certain conditions (high humidity).
  • The observed luminous structure and streamer zone play a role in positive leader propagation.
  • These findings enhance the understanding of positive long spark and lightning leader physics.