Abstract
AbstractWhen a sonogram of the nighttime whistlers observed in Wuchang, China, at a low latitude (at a geomagnetic latitude of 19.4°N) was studied in detail, whisker‐type spectral components were observed, which may be due to the waveguide propagation effect of the second‐ and third‐order modes, in the spectra of intense whistlers accompanied by echo trains. By applying the field analysis direction‐finding method to this part, the propagation characteristics are derived and the results exhibited a tendency identical to that of the characteristics of tweek atmospherics. It was found that the whistlers transmitted through the ionosphere at a very low latitude in Zhanjiang (geomagnetic latitude of 10.0°N) and exhibited an extremely rare waveguide mode propagation after subionospheric propagation of over approximately 1000 km.
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