VHF lightning mapping observations of a triggered lightning flash

Authors

  • H. E. Edens,

    Corresponding author
    1. Langmuir Laboratory, New Mexico Institute of Mining and Technology, Socorro, New Mexico, USA
    • Corresponding author: H. E. Edens, Langmuir Laboratory, New Mexico Institute of Mining and Technology, 801 Leroy Pl., Socorro, NM 87801, USA. (edens@nmt.edu)

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  • K. B. Eack,

    1. Langmuir Laboratory, New Mexico Institute of Mining and Technology, Socorro, New Mexico, USA
    2. Physics Department, New Mexico Institute of Mining and Technology, Socorro, New Mexico, USA
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  • E. M. Eastvedt,

    1. Langmuir Laboratory, New Mexico Institute of Mining and Technology, Socorro, New Mexico, USA
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  • J. J. Trueblood,

    1. Langmuir Laboratory, New Mexico Institute of Mining and Technology, Socorro, New Mexico, USA
    2. Physics Department, New Mexico Institute of Mining and Technology, Socorro, New Mexico, USA
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  • W. P. Winn,

    1. Langmuir Laboratory, New Mexico Institute of Mining and Technology, Socorro, New Mexico, USA
    2. Physics Department, New Mexico Institute of Mining and Technology, Socorro, New Mexico, USA
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  • P. R. Krehbiel,

    1. Langmuir Laboratory, New Mexico Institute of Mining and Technology, Socorro, New Mexico, USA
    2. Physics Department, New Mexico Institute of Mining and Technology, Socorro, New Mexico, USA
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  • G. D. Aulich,

    1. Langmuir Laboratory, New Mexico Institute of Mining and Technology, Socorro, New Mexico, USA
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  • S. J. Hunyady,

    1. Langmuir Laboratory, New Mexico Institute of Mining and Technology, Socorro, New Mexico, USA
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  • W. C. Murray,

    1. Science and Mathematics Division, University of New Mexico Valencia, Los Lunas, New Mexico, USA
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  • W. Rison,

    1. Langmuir Laboratory, New Mexico Institute of Mining and Technology, Socorro, New Mexico, USA
    2. Electrical Engineering Department, New Mexico Institute of Mining and Technology, Socorro, New Mexico, USA
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  • S. A. Behnke,

    1. Langmuir Laboratory, New Mexico Institute of Mining and Technology, Socorro, New Mexico, USA
    2. Physics Department, New Mexico Institute of Mining and Technology, Socorro, New Mexico, USA
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  • R. J. Thomas

    1. Langmuir Laboratory, New Mexico Institute of Mining and Technology, Socorro, New Mexico, USA
    2. Electrical Engineering Department, New Mexico Institute of Mining and Technology, Socorro, New Mexico, USA
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Abstract

[1] On 3 August 2010 an extensive lightning flash was triggered over Langmuir Laboratory in New Mexico. The upward positive leader propagated into the storm's midlevel negative charge region, extending over a horizontal area of 13 × 13 km and 7.5 km altitude. The storm had a normal-polarity tripolar charge structure with upper positive charge over midlevel negative charge. Lightning Mapping Array (LMA) observations were used to estimate positive leader velocities along various branches, which were in the range of 1–3 × 104 m s−1, slower than in other studies. The upward positive leader initiated at 3.4 km altitude, but was mapped only above 4.0 km altitude after the onset of retrograde negative breakdown, indicating a change in leader propagation and VHF emissions. The observations suggest that both positive and negative breakdown produce VHF emissions that can be located by time-of-arrival systems, and that not all VHF emissions occurring along positive leader channels are associated with retrograde negative breakdown.

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