ELF radiation from the New Zealand power system

Details ELF radiation from the New Zealand power system ELF radiation from the New Zealand power system

Apr 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979p%26ss...27..537b&link_type=abstract

Planetary and Space Science, Volume 27, Issue 4, p. 537-540.

Physics

Scientific paper

Measurements of the vertical electric field strength of ELF and VLF radio waves in the Earth-ionosphere wave-guide to the south of New Zealand are presented. No significant mains harmonics (>1μ Vm-1) are found at frequencies above 1.5 kHz and the harmonic content is found to decrease in a southerly direction until at Stewart Island only a single but strong (~10 sm Vm-1) harmonic is present at 300 Hz. This harmonic is shown to be radiated by the Benmore-Haywards d.c. power line and not by the standard 220 kV a.c. power grid. A method of determining the level of the 300 Hz radiation retrospectively from the records of the Amberley Magnetic Observatory is described.

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