Upward lightning observations from towers in São Paulo and...
Transcript of Upward lightning observations from towers in São Paulo and...
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Upward lightning observations from towers in São Paulo and
comparison with LLS data
Marcelo Magalhães Fares SabaAmanda Romão de Paiva
Kleber P. NaccaratoCarina SchumannRachel I. Albrecht
Robson JaquesMarco Antônio Ferro
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LLSs installed during CHUVA
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Data from other World Wide
LLS
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Vaisala GLD 360
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WWLLN (2008)
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STARNET (2009)
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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 Leaderinitiation
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 kATLS200: -22 kARindat: -20 kA
Brasildat: -16 kATLS200: -27 kARindat: -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 – CG29,619
172159535339392
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Location Accuracy (m)
• BRASILDAT – IC3,431
25,1567,447
430797600
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Location Accuracy (m)
• BRASILDAT – CG19,665
343363309354474
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Location Accuracy (m)
• TLS200 – LF 72312024
7,469100
03330
8,346151015
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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.