Temporal-spatial modeling of electron density enhancement due to successive lightning strokes

Details Temporal-spatial modeling of electron density enhancement due to successive lightning strokes Temporal-spatial modeling of electron density enhancement due to successive lightning strokes

Nov 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010jgra..11500e59l&link_type=abstract

Journal of Geophysical Research, Volume 115, Issue 6, CiteID A00E59

Physics

3

Ionosphere: Ionosphere/Atmosphere Interactions (0335), Atmospheric Processes: Lightning, Atmospheric Processes: Regional Modeling, Atmospheric Processes: Atmospheric Electricity

Scientific paper

We report results on the temporal-spatial modeling of electron density enhancement due to successive lightning strokes. Stroke rates based on World-Wide Lightning Location Network measurements are used as input to an axisymmetric Finite Difference Time Domain model that describes the effect of lightning electromagnetic pulses (EMP) on the ionosphere. Each successive EMP pulse interacts with a modified background ionosphere due to the previous pulses, resulting in a nonlinear electron density perturbation over time that eventually reaches a limiting value. The qualitative ionospheric response to successive EMPs is presented in 2-D, axisymmetric space. Results from this study show that the nonlinear electron density perturbations due to successive lightning strokes must be taken into account and varies with altitude. The limiting maximum electron density is reached earlier in time for higher altitudes, and the most significant effect occurs at 88 km. The limiting modeled electron density profile in the 83-91 km altitude range does not depend on the initial electron density.

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