Physics
Scientific paper
Mar 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977jatp...39..347l&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, vol. 39, Mar. 1977, p. 347-357.
Physics
Ionospheric Propagation, Radio Communication, Radio Frequency Interference, Very Low Frequencies, Midlatitude Atmosphere, Radio Transmitters, Sunrise, Transequatorial Propagation
Scientific paper
The frequency and latitude dependence of sunrise modal interference was investigated as observed over long west-east VLF propagation paths. Modal interference spacings were found to be constant to within 10% over a 0-60 deg latitude range for this direction of propagation and no significant anomalies associated with trans-equatorial propagation were observed. Comparison with middle latitutde east-west data suggests that modal interference spacings are slightly greater for propagation to the west than to the east. The locations of two-mode signal minima at night are derived and used to explain some propagation asymmetries previously reported in the literature.
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