Periodic fluctuations in the earth-ionosphere waveguide

Details Periodic fluctuations in the earth-ionosphere waveguide Periodic fluctuations in the earth-ionosphere waveguide

Apr 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86.2461b&link_type=abstract

Journal of Geophysical Research, vol. 86, Apr. 1, 1981, p. 2461-2466.

Physics

2

D Region, Earth Atmosphere, Ionospheric Propagation, Periodic Variations, Very Low Frequencies, Diurnal Variations, Lunar Tides, Magnetoactivity, Power Spectra, Solar Flares

Scientific paper

VLF phase and amplitude measurements made in 1967 at Byrd Station, Antarctica, using 18.6-kHz transmissions from NLK, Washington, have been analyzed for lunar-induced and hebdomadal variations. The VLF propagation path was 14,250 km in length and nearly constant in longitude. The lunar-induced variations are found to be + or - 18 deg in phase and + or - 0.26 dB in amplitude and are explained by height changes in the D region of the ionosphere. The hebdomadal variation in VLF amplitude shows a 0.46-dB increase during the Sunday daylight hours, relative to the Monday-Saturday average, and is ascribed to man-made changes in the D region.

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