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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