The measurement of incident and azimuthal angles and the polarization of whistlers at low latitudes

Details The measurement of incident and azimuthal angles and the polarization of whistlers at low latitudes The measurement of incident and azimuthal angles and the polarization of whistlers at low latitudes

Mar 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977p%26ss...25..233o&link_type=abstract

Planetary and Space Science, vol. 25, Mar. 1977, p. 233-241.

Physics

4

Ionospheric Propagation, Polarized Electromagnetic Radiation, Tropical Regions, Whistlers, Azimuth, Block Diagrams, Elliptical Polarization, Frequency Discriminators, Incident Radiation, Ionospheric Electron Density, Polarization (Waves), Waveguides

Scientific paper

In order to estimate the path latitude of low-latitude whistlers, the measurement of the direction of arrival (bearing and elevation) and the polarization has been successfully carried out at a low-latitude station at Takayama (geomag. lat. 20 deg) by using newly developed electronic devices. The system of using two crossed loops and a vertical monopole is, in principle, based on Crary's method and is effective for elliptically polarized waves. The measurements were made at a specific frequency of 4.5 kHz. The main results of preliminary experiments are: (1) the exit points of observed whistlers are located several tens of kilometers approximately north-north-east of the observing site and (2) although a few whistlers have shown polarization very close to circular, the polarization of most whistlers is generally elliptical, indicating the effect of multiple rays propagating in the earth-ionosphere waveguide.

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