Physics
Scientific paper
Oct 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jatp...44..855m&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, vol. 44, Oct. 1982, p. 855-862.
Physics
Ionospheric Propagation, Midlatitude Atmosphere, Radio Transmission, Signal Fading, Very Low Frequencies, Diurnal Variations, Frequency Converters, Propagation Modes
Scientific paper
The seasonal variation of the mode-conversion effect is investigated using more than 3 years of observations of regular signal fading in the sunrise transition for VLF (18.6-kHz) signal propagation from a transmitter in Washington State to a receiver near Osaka, Japan. Reliable data on the occurrence times of amplitude minima are obtained by superposing the data for each full year of measurement. Based on the seasonal variation of the occurrence times, it is concluded that: (1) the height of the earth-ionosphere waveguide is somewhat greater than 90 km at night in winter; (2) the argument of the ratio of the two major mode-conversion coefficients for day-night propagation depends on the length of the transition region in an essentially linear manner; (3) the length of the transition region is not always dependent on the path-terminator angle throughout the year; and (4) the transition region is effectively extended in the summer owing to the incomplete day-night transition in the lower ionosphere.
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