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"Eletromagnetic model of a lightning dart leader in the earth atmosphere" A.V.Gordeev
(Russian Research Center
“Kurchatov Institute”) Abstract: The
fundamentally new approach to the lightning dart leader structure
investigation is suggested, which is connected with the charge separation
and the appearance of the Hall potential in the current-channel magnetic
field of the lightning dart leader [1, 2]. Generation of the strong radial
electric field provides both the relativistic electron drift along the
lightning channel and the breakdown in the Earth atmosphere at the front
of the propagating filament. The magnetic selfinsulation in the current
channel ensures the propagation of the current filament with the
relativistic electrons up to the Earth surface [3]. After this stage the
reflected magnetic selfinsulation wave realizes the return stroke stage of
the lightning that is accompanied by the strong gas heating in the
lightning channel. The current data in the lightning dart leader channel
(4-11 kA) and the range of the X-ray emission from the lightning channel
(30-250 keV), which are obtained in in-situ observations [4], are in
reasonably good agreement with the estimates, made in the frame of this
model. Profiles of magnetic field Bq,
electron concentration ne, electron velocity vez and
radial electric field Er in current channel for the current
value 11kA are presented in figure. References:
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