Detection of in-cloud lightning with VLF/LF and VHF networks for studies of the initial discharge phase

Details Detection of in-cloud lightning with VLF/LF and VHF networks for studies of the initial discharge phase Detection of in-cloud lightning with VLF/LF and VHF networks for studies of the initial discharge phase

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3523802b&link_type=abstract

Geophysical Research Letters, Volume 35, Issue 23, CiteID L23802

Physics

5

Atmospheric Processes: Lightning, Atmospheric Processes: Atmospheric Electricity, Atmospheric Processes: Instruments And Techniques

Scientific paper

Lightning initiation and the associated in-cloud parts of lightning flashes have been studied by comparing thunderstorm data from two independent networks, LINET and SAFIR-type systems, operating in the VLF/LF and VHF regime, respectively. The two networks respond to radiation pulses with different length scales; an event detected by VLF/LF must be hundreds of meters long. In all 12 storms studied, up to half of the first in-cloud events detected with the VHF networks were found to be closely time-correlated with the first VLF/LF signal. Range-normalized VLF/LF signal amplitudes of the time-coincident events (TCEs) are comparable to amplitudes of weak cloud-to-ground strokes. Without measured preparatory VHF emission activity, initial breakdown in TCEs seems to start directly with a strong discharge step producing signatures in VLF/LF records. The TCE data are consistent with lightning initiation via a runaway breakdown mechanism that extended over hundreds of meters.

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