The effect of sporadic-E on the nocturnal propagation of ELF radio waves

Details The effect of sporadic-E on the nocturnal propagation of ELF radio waves The effect of sporadic-E on the nocturnal propagation of ELF radio waves

Dec 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977jatp...39.1379b&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, vol. 39, Nov.-Dec. 1977, p. 1379-1387.

Physics

1

Extremely Low Radio Frequencies, Ionospheric Propagation, Nocturnal Variations, Sporadic E Layer, Atmospheric Ionization, Radio Attenuation, Radio Frequency Interference, Radio Waves

Scientific paper

Calculations have been made of the parameters of ELF propagation under typical nocturnal ionospheres in the presence of sporadic-E. The presence of nocturnal sporadic-E is shown to produce marked maxima and minima in the propagation characteristics of ELF radio waves and these features are found to move to lower frequencies as the height of the sporadic layer is increased. It is considered that these maxima and minima are produced by interference between the ELF waves reflected from the lower night-time ionosphere and the ELF waves which penetrate this lower region to be reflected from the layer of sporadic ionization above. These results provide an explanation for the marked variability observed in nocturnal ELF propagation. Atmospheric spectra recorded earlier are shown to exhibit spectral maxima and minima which can be reasonably explained in terms of propagation in the presence of sporadic ionization in the E-region.

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