Abstract
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 ±18° in phase and ±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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