Upward lightning observations from towers in So Paulo and - - PowerPoint PPT Presentation

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Upward lightning observations from towers in So Paulo and - - PowerPoint PPT Presentation

Feb 22, 2023 109 likes •397 views

Upward lightning observations from towers in So Paulo and comparison with LLS data Marcelo Magalhes Fares Saba Amanda Romo de Paiva Kleber P. Naccarato Carina Schumann Rachel I. Albrecht Robson Jaques Marco Antnio Ferro LLSs

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Upward lightning observations from towers in São Paulo and comparison with LLS data

Marcelo Magalhães Fares Saba Amanda Romão de Paiva Kleber P. Naccarato Carina Schumann Rachel I. Albrecht Robson Jaques Marco Antônio Ferro

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SLIDE 2

LLSs installed during CHUVA

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SLIDE 3

Data from other World Wide LLS

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SLIDE 4

Vaisala GLD 360

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SLIDE 5

WWLLN (2008)

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SLIDE 6

STARNET (2009)

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SLIDE 7

ATDNET

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Detection and Location of:

  • Leader initiation
  • Recoil leaders
  • M-component
  • Return strokes
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Leader initiation

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Recoil leaders

Negative leaders retracing portions of + leader path

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M-components

During a luminous (current-carrying) channel connected to the tower

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Return Strokes

  • No luminosity at all
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Leader initiation

2 out of 15

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Recoil leaders

none

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M-components

During a luminous (current-carrying) channel connected to the tower

11 out of 38

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Return Strokes

4 out of 4

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Detected Events

LLS Leader initiation M-component Recoil Leaders Return Stroke Total TLS 200 LF 10 4 14 Rindat – IC Rindat - CG 3 3 6 BRASILDAT - IC 2 5 7 BRASILDAT- CG 3 2 5 LINET - IC 1 1 WWLLN GLD360 ATDNET STARNET HS video 15 38 100s 4

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Why were some M-comp detected?

Brasildat: -13 kA TLS200: -22 kA Rindat: -20 kA Brasildat: -16 kA TLS200: -27 kA Rindat: -25 kA

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“non-impulsive” M-comp.

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“Impulsive” M-comp.

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RS and M-comp. waveforms

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Location Accuracy (m)

  • RINDAT – CG

29,619 172 159 535 339 392

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Location Accuracy (m)

  • BRASILDAT – IC

3,431 25,156 7,447 430 797 600

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Location Accuracy (m)

  • BRASILDAT – CG

19,665 343 363 309 354 474

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Location Accuracy (m)

  • TLS200 – LF

72 31 20 24 7,469 10 33 30 8,346 15 10 15

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Location Accuracy (m)

  • LINET – IC

3,835

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Summary

  • Return stroke is the process most detected in

upward flashes. However their presence is scarce in upward flashes (1 flash out of 15).

  • Only impulsive M-components are detected. Most

are not impulsive.

  • Most upward flashes are composed only by the

initial continuous current which is not detected.

  • Therefore, detection of upward flashes is not

trivial.