Papers Published

1. Cheng, Zhenggang and Cummer, Steven A., Broadband VLF measurements of lightning-induced ionospheric perturbations, Geophysical Research Letters, vol. 32 no. 8 (2005), pp. 08804 - [2004GL022187] .
   (last updated on 2007/04/17)

   Abstract:
   Very low frequency (VLF) electromagnetic pulses radiated by lightning are an effective tool for probing the D region ionosphere. We detect and measure the D region ionospheric disturbances caused by the strong lightning flash by analyzing the broadband VLF spectrum from lightning that occurred just before and after a nearby intense lightning discharge. Comparing the measured electron density changes to those from previous measurements and the theoretical expectations, we find the detected perturbations are consistent with the theoretically predicted ionization changes produced directly by the lightning electromagnetic pulse. Copyright 2005 by the American Geophysical Union.

   Keywords:
   Electromagnetic pulse;Perturbation techniques;Ionospheric electromagnetic wave propagation;Electric inductors;Ionization;Spectrum analysis;Lightning;Carrier concentration;