Global modeling of accumulated electron density enhancements over thunderstorms from successive strong lightning strokes
This global investigation addresses the issue of energetic coupling between the troposphere and ionosphere by focusing on the effects of strong lightning on the lower ionosphere (80-105 km altitude). Lightning radiated energy and stroke location as measured by the World Wide Lightning Location Network (WWLLN) will be used as input to a two-dimensional electromagnetic model that accumulates, over the course of a strong lightning storm, the electron density changes resulting from the interaction of the lightning’s electromagnetic pulse (EMP) with the lower ionosphere. We use this model to produce time-dependent global maps of electron density variations and their related conductivity variations. We compare the predictions of the electromagnetic model of the accumulated effect of lightning on lower ionospheric electron density with in-situ rocket-measured electric field transients from the 1 September 1995 Thunderstorm-III rocket campaign. This rocket was launched within 300 km of two lightning storms and measured 60 lightning-driven electric field changes at 75-130 km altitude during the rocket descent. These data are part of a very limited set of in-situ measurements over intense lightning regions that can be used in comparison to electromagnetic models of lightning radiation in the lower ionosphere.
Erin H. Lay Robert H. Holzworth Mengu Cho Jeremy N. Thomas
Dept.of Earth and Space Sciences, University of Washington, Seattle, WA Department of Electrical Engineering, Kyushu Institute of Technology
国际会议
第13届国际大气电学会议(The 13th International Conference on Atmospheric Electricity)
北京
英文
2007-08-13（万方平台首次上网日期，不代表论文的发表时间）