Computer Science
Scientific paper
Sep 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992p%26ss...40.1185s&link_type=abstract
Planetary and Space Science (ISSN 0032-0633), vol. 40, no. 9, p. 1185-1191.
Computer Science
4
Earth-Ionosphere Waveguide, Night Sky, Whistlers, Dispersion, Diurnal Variations, Ionospheric Propagation, Polarization (Waves), Very Low Frequencies
Scientific paper
An analysis of the excitation of a night-time earth-ionosphere waveguide near the cut-off frequencies of the waveguide modes is presented as applicable to very unusual whistlers with additional dispersion. Additional dispersion of a whistler in a night-time earth-ionosphere waveguide is caused by weakly-attenuated QTE(m) waveguide modes (left-hand polarized near respective cut-off frequencies), excited by the whistler inside the waveguide as a result of anisotropy of the ionosphere. Far from the corresponding cut-off frequencies (separated by several hundred Hz), the attenuation of the first QTE(m) modes in mean and low latitudes is appreciably higher upon West-East propagation compared with East-West propagation. Close to the cut-off frequencies these modes have attenuation coefficient minima which exhibit a relatively weak dependence upon azimuth.
Hayakawa Masahiko
Shimakura Shin
Sukhorukov Alexander I.
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