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GEOPHYSICAL RESEARCH LETTERS,
VOL. 35,
L14812,
5 PP., 2008
doi:10.1029/2008GL033984
Rare measurements of a sprite with halo event driven by a negative lightning discharge over Argentina
Center for Atmospheric and Space Sciences, Utah State University, Logan, Utah, USA
Center for Atmospheric and Space Sciences, Utah State University, Logan, Utah, USA
Center for Atmospheric and Space Sciences, Utah State University, Logan, Utah, USA
Department of Electrical and Computer Engineering, Duke University, Durham, North Carolina, USA
Department of Electrical and Computer Engineering, Duke University, Durham, North Carolina, USA
Department of Earth and Space Sciences, University of Washington, Seattle, Washington, USA
National Geomagnetism Program, USGS, Denver, Colorado, USA
Physics Department, Digipen Institute of Technology, Redmond, Washington, USA
National Institute of Space Research, Sao Jose dos Campos, Brazil
Department of Earth and Space Sciences, University of Washington, Seattle, Washington, USA
National Institute of Space Research, Sao Jose dos Campos, Brazil
Brazilian Southern Regional Space Research Center, Santa Maria, Brazil
As part of a collaborative campaign to investigate Transient Luminous Events (TLEs) over South America, coordinated optical, ELF/VLF, and lightning measurements were made of a mesoscale thunderstorm observed on February 22–23, 2006 over northern Argentina that produced 445 TLEs within a ∼6 hour period. Here, we report comprehensive measurements of one of these events, a sprite with halo that was unambiguously associated with a large negative cloud-to-ground (CG) lightning discharge with an impulsive vertical charge moment change (ΔMQv) of −503 C.km. This event was similar in its location, morphology and duration to other positive TLEs observed from this storm. However, the downward extent of the negative streamers was limited to 25 km, and their apparent brightness was lower than that of a comparable positive event. Observations of negative CG events are rare, and these measurements provide further evidence that sprites can be driven by upward as well as downward electric fields, as predicted by the conventional breakdown mechanism.
Received 13 March 2008; accepted 23 June 2008; published 29 July 2008.
Citation: (2008), Rare measurements of a sprite with halo event driven by a negative lightning discharge over Argentina, Geophys. Res. Lett., 35, L14812, doi:10.1029/2008GL033984.
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