NDLI: The lower characteristic ELF altitude of the Earth-ionosphere waveguide: Schumann resonance observations and aeronomical estimates

Content Provider	IEEE Xplore Digital Library
Author	Greifinger, P. Mushtak, V. Williams, E.
Copyright Year	2005
Abstract	Propagation of ELF fields in the Earth-ionosphere waveguide is treated in terms of a two-dimensional method with two complex characteristic altitudes as actual propagation parameters. The day-to-night variations of the lower characteristic altitude are estimated in two different ways: theoretically, on the basis of the parameter's physical model and representative day- and night-time conductivity profiles for the lower ionospheric D-region, and experimentally, from systematic observations of the background electromagnetic signal in the Schumann resonance (SR) frequency range. A simple technique for considerably eliminating undetectable factors (the average current moment, the ionospheric properties over sources, etc.) and smoothing resonance effects in experimental data is applied. It is found that theoretical-aeronomical and experimental estimates are in a reasonable agreement, showing an approx. 20 to 25% day-to-night increase in the lower characteristic altitude within the lower SR frequency range (SR I to III).
Starting Page	250
Ending Page	254
File Size	881356
Page Count	5
File Format	PDF
ISBN	0780393740
DOI	10.1109/EMCECO.2005.1513116
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-06-21
Publisher Place	Russia
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Strontium Ground penetrating radar Geophysical measurement techniques Resonant frequency Electromagnetic waveguides Electromagnetic modeling Conductivity Resonance Frequency estimation Electromagnetic propagation
Content Type	Text
Resource Type	Article

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