Re-radiation of VLF radio waves from mountain ranges

Details Re-radiation of VLF radio waves from mountain ranges Re-radiation of VLF radio waves from mountain ranges

Apr 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jatp...51..339t&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 51, April 1989, p. 339-349.

Physics

2

Mountains, Radio Waves, Very Low Frequencies, Wave Scattering, Electric Fields, Field Strength, Refractivity

Scientific paper

VLF signals transmitted from Hawaii, Japan and Australia (NPM, NDT, NWC) and scattered from large mountain ranges such as the Andes or Rockies are monitored in New Zealand in the presence of the much larger direct signals. Measurements of the amplitudes of these indirect signals are reported in the range 0.1-2.0 micro V/m. Sudden changes in the refractive index along the path, such as those caused by abrupt changes in ground conductivity, are shown to give rise to reflected amplitudes much smaller than those measured. However, the measured amplitudes are found to be comparable with reasonable estimates of the reradiation from typical surface currents induced by the incident wave in mountains of suitable height, ground conductivity and steepness.

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