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| | Schumann Resonance at The University of Iowa (Site not responding. Last check: 2007-10-04) |
 | | The resonant frequency of the cavity falls in the ultra-low frequency (ULF) and extremely low frequency (ELF) bands in the range of 5–50 Hz, and depends on several factors, including the electrical parameters of the atmosphere, and the state (height, ionization level) of the ionosphere. |
 | | The Schumann Resonances are the broad bumps n the spectrum. |
 | | Resonances in the Earth-Ionosphere Cavity, Alexander P. Nickolaenko, Usikov Institute for Radio-Physics and Electronics, National Academy of Sciences of the Ukraine, Kharkov, Ukraine and Masashi Hayakawa, Dept. of Electronic Engineering, The University of Electro-Communications, Tokyo, Japan (Kluwer), 2002. |
| www.iihr.uiowa.edu /projects/schumann/Index.html (1460 words) |
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