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Leader-chasing behavior in negative artificial triggered lightning flashes.

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Summary
This summary is machine-generated.

High-speed cameras captured unusual lightning behavior where two leaders, not one, preceded a return stroke. This "leader-chasing" involved leaders with same or opposite polarities interacting in the same channel.

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Area of Science:

  • Atmospheric Physics
  • Electromagnetism

Background:

  • Lightning phenomena involve complex leader and return stroke sequences.
  • Typically, a return stroke is preceded by a single dart leader.

Purpose of the Study:

  • To investigate unusual dart leader propagation patterns in triggered lightning.
  • To analyze the interaction of multiple leaders preceding a single return stroke.

Main Methods:

  • High-speed camera observation of triggered lightning flashes.
  • Analysis of leader/return stroke sequences in classical and altitude-triggered lightning.

Main Results:

  • Observed two distinct cases of "leader-chasing" behavior where two leaders successively occupied the same channel before a return stroke.
  • In one case, leaders of opposite polarity merged, forming a new leader with the polarity of the first.
  • In the second case, a same-polarity leader caught up to and disappeared, with minimal impact on the first leader's propagation.

Conclusions:

  • Identified and described a novel "leader-chasing" phenomenon in triggered lightning.
  • Demonstrated that multiple leaders can compete or interact within the same channel before a return stroke.
  • Highlighted variations in leader interaction based on polarity and propagation dynamics.