Lower ionospheric modification by lightening-EMP: Simulation of the night ionosphere over the United States

Details Lower ionospheric modification by lightening-EMP: Simulation of the night ionosphere over the United States Lower ionospheric modification by lightening-EMP: Simulation of the night ionosphere over the United States

Jan 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28..199r&link_type=abstract

Geophysical Research Letters, Volume 28, Issue 2, p. 199-202

Physics

24

Ionosphere: Ionization Mechanisms, Ionosphere: Ionospheric Disturbances, Meteorology And Atmospheric Dynamics: Atmospheric Electricity, Meteorology And Atmospheric Dynamics: Lightning

Scientific paper

It has recently been suggested that successive intense lightning-electromagnetic pulse (EMP) events could cause significant large-scale changes to the properties of the nighttime lower ionosphere. In order to examine this quantitatively, data on lightning detected over the United States are combined with the output from a simulation code. During the course of a night strong lightning-EMP events can lead to significant (~100% or even greater) increases in the electron density of the lower ionosphere, with the largest increases at ~90 km altitude. Regions with significant decreases in electron density are also possible. It is shown that changes in the electron temperature of the lower ionosphere are unlikely to be significant. The time required to produce large-scale changes of ionospheric electron density above an active thunderstorm may explain the observation of a thunderstorm ``modification time'' before red sprite activity is initiated.

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