Direction finding technique for elliptically polarized VLF electromagnetic waves and its application to the low-latitude whistlers

Details Direction finding technique for elliptically polarized VLF electromagnetic waves and its application to the low-latitude whistlers Direction finding technique for elliptically polarized VLF electromagnetic waves and its application to the low-latitude whistlers

Sep 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975jatp...37.1193t&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, vol. 37, Sept. 1975, p. 1193-1202.

Physics

3

Elliptical Polarization, Polarized Electromagnetic Radiation, Radio Direction Finders, Very Low Frequencies, Frequency Response, Incident Radiation, Instrument Errors, Sonograms, Tropical Regions

Scientific paper

A new method for direction finding of elliptically polarized VLF electromagnetic waves has been developed. The method uses simple algebraic relations between the vertical electric field and the horizontal magnetic fields of the received waves to eliminate TE components of the magnetic field. The present method can give a reasonably accurate estimate of the angle of incidence as well as azimuth angle when the incident wave is elliptically polarized, and is complementary to the classical goniometer method which is suited for the azimuth determination of linearly polarized VLF waves. The present technique is applied to the direction finding of whistlers observed at Kakioka (26 deg N in geomagnetic latitude). The results are: (1) Most of the whistlers analyzed come from nearly directly overhead and show small L to R ratio. (2) The measured direction shows little frequency dependence especially in the frequency range where the sonagram trace is continuous.

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