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Researchers identified a specific thundercloud charge structure responsible for gigantic jets, rare atmospheric electrical discharges. This structure, linked to intense storm pulses, explains why gigantic jets are infrequently observed.

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Area of Science:

  • Atmospheric science
  • Electromagnetism
  • Meteorology

Background:

  • Gigantic jets are infrequent atmospheric electrical discharges connecting thunderclouds to the ionosphere.
  • The specific charge structure of parent thunderclouds is crucial for gigantic jet formation.
  • Previous studies lacked observational verification of these parent thundercloud charge structures.

Purpose of the Study:

  • To identify the probable thundercloud charge structure of storms producing gigantic jets.
  • To correlate meteorological conditions with the formation of gigantic jets.

Main Methods:

  • Analysis of meteorological observations from gigantic jet parent storms.
  • Lightning simulation results to model leader propagation.
  • Comparison of simulation outputs with observational data.

Main Results:

  • Identified a probable thundercloud charge structure with a narrow upper charge region.
  • This structure forms after intense convective pulses, indicated by storm top radial velocity differentials and spectrum width.
  • Simulations demonstrated that this charge structure generates leader trees consistent with observations.

Conclusions:

  • The identified charge structure is likely responsible for initiating gigantic jets.
  • The transient nature of convective pulses may explain the rarity of gigantic jets.
  • This study provides the first observationally verified thundercloud charge structure for gigantic jet parent storms.