Computer Science
Scientific paper
Jul 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983natur.304..246s&link_type=abstract
Nature (ISSN 0028-0836), vol. 304, July 21, 1983, p. 246, 247.
Computer Science
2
Extremely Low Frequencies, F 2 Region, Ionospheric Propagation, Magnetohydrodynamic Waves, Waveguides, Ionospheric Electron Density, Ionospheric Ion Density, Refractivity
Scientific paper
New possibilities for extremely low frequency radio communication are shown to arise from the peculiar waveguide properties of the anisotropic multicomponent magnetoplasma in the upper ionosphere. Unlike the well-known high-frequency communication channels formed by the electron density distribution in the lower ionosphere, the variable ionic composition and the geomagnetic field are essential for this spectral range below the ionic gyrofrequency. This global waveguide cavity, effective for Alfven wave propagation, surrounds the earth near the ionospheric F2 layer maximum. This cavity is not connected with the boundary of any medium; the waveguidelike distribution of refractive index for Alfven waves is determined by smooth altitudinal profiles of electron and ionic densities. The dispersive properties of these waveguides are very sensitive to the proportion of light and heavy ions.
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