The measurement of incident and azimuthal angles and the polarization of whistlers at low latitudes |
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| Authors: | T Okada A Iwai M Hayakawa |
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| Institution: | Research Institute of Atmospherics, Nagoya University, Toyokawa, Aichi 442, Japan;Department of Physics, University of Sheffield, England |
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| Abstract: | 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 a low-latitude station at Takayama (geomag. lat. 26°), by using our newly developed electronic devices. Our 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 our preliminary experiments are (i) the exit points of observed whistlers are located several tens of kilometers approximately north-north-east of the observing site and (ii) although a few whistlers have shown the polarization very close to circular, the polarization of most whistlers are generally elliptical, indicating the effect of multi-rays propagating in the Earth- ionosphere waveguide. |
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