Waveguide model analyses of Omega VLF wave propagation at 13.6 kHz

Details Waveguide model analyses of Omega VLF wave propagation at 13.6 kHz Waveguide model analyses of Omega VLF wave propagation at 13.6 kHz

Jan 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jatp...48...15k&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 48, Jan. 1986, p. 15-23.

Physics

3

Ionospheric Propagation, Mathematical Models, Omega Navigation System, Transequatorial Propagation, Very Low Frequencies, Waveguides, Amplitudes, Diurnal Variations, Ionospheric Conductivity, Phase Shift, Propagation Modes, Solar Position, Wave Propagation

Scientific paper

Diurnal variations of the phase and amplitude of VLF waves on a frequency of 13.6 kHz propagated over the west-to-east transequatorial path from La Reunion to Inubo, Japan, are analyzed. The diurnal phase shift is 7.8 microsec Mm and the diurnal amplitude change is 7.1 dB. The modal interference distance in the nighttime waveguide is 1390 km, as derived from time intervals of sunrise amplitude fadings. All of the observed quantities are explained by means of a conventional isotropic waveguide model assuming an exponentially varying ionospheric conductivity. The reference heights of the ionosphere are determined to be 75.0 and 88.5 km and the height gradients of the ionospheric conductivity 0.3 and 0.5/km for day- and nighttime conditions, respectively. It is suggested that the sunrise at the ionospheric reflection height occurs when the solar zenith angle x = 94 deg and that the sunrise terminator with a width less than 190 km can be replaced by an ionization discontinuity.

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