Propagation mechanism of very unusual low-latitude whistlers with additional traces of the earth-ionosphere waveguide propagation effect

Details Propagation mechanism of very unusual low-latitude whistlers with additional traces of the earth-ionosphere waveguide propagation effect Propagation mechanism of very unusual low-latitude whistlers with additional traces of the earth-ionosphere waveguide propagation effect

Apr 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991p%26ss...39..611s&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 39, April 1991, p. 611-613, 615, 616.

Physics

6

Ionospheric Propagation, Whistlers, Atmospherics, Magnetosphere-Ionosphere Coupling

Scientific paper

The purpose of the paper is to discuss the propagation mechanism of very unusual whistlers with additional traces of the earth-ionosphere waveguide propagation, observed simultaneously at Sakushima and Kagoshima on the basis of the simultaneous location of their causative atmospherics and their ionospheric exit regions in the Northern Hemisphere. This is the first simultaneous location of exit regions of whistlers and their causative atmospherics. It is found that the causative atmospherics of very unusual whistlers are located exactly at the duct entrance and are trapped in a magnetospheric duct in the local sunrise meridian. Hence, the additional traces of the earth-ionosphere waveguide propagation are concluded to be due to the subionospheric propagation after leaving the ionosphere. The longitudinal gradient of the ionosphere at the duct exit enables the whistler wave energy to be concentrated in a restricted sector in azimuth (in this case East to West) and to be received at the stations. Wave emergence from the ionosphere over a wide exit angle, together with the extremely small divergence loss, results in an efficient wave interference. This leads to the formation of the conspicuous traces of the first- and second-order-mode cut-offs of very unusual whistlers.

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