V.L.F. propagation over long paths

Details V.L.F. propagation over long paths V.L.F. propagation over long paths

Jan 1967

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1967jatp...29...73k&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, vol. 29, no. 1, pp. 73-85

Physics

1

Scientific paper

Cycle slips and other evidence of interference have been observed for v.l.f. signals from NPG Seattle (18.6 and 24 kc/s), WWVL Boulder (20 kc/s) and NBA Panama (18 kc/s), each approximately 12,000 km from the receiver at Lower Hutt. Phase and amplitude variations are analysed to identify the interfering signals present. Starting from Crombie's model of mode conversion at a shadow line it is shown how cycle losses recorded during sunrise may be produced. Consistent with the E-W non-reciprocity of v.l.f. propagation multi-path interference is discernible only for NBA; it is found that the long path signal for this station caused severe interference including cycle gains at sunset.

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