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VLF Attenuation Rates Deduced From Aircraft Observations Near the Antipode of NPM
Author(s) -
Bickel John E.
Publication year - 1967
Publication title -
radio science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.371
H-Index - 84
eISSN - 1944-799X
pISSN - 0048-6604
DOI - 10.1002/rds196726575
Subject(s) - attenuation , ionosphere , amplitude , transmitter , daytime , geomagnetic latitude , earth's magnetic field , very low frequency , geology , d region , radio wave , physics , atmospheric sciences , geodesy , meteorology , geophysics , optics , telecommunications , magnetic field , channel (broadcasting) , quantum mechanics , computer science , astronomy
Airborne phase and amplitude records of the transmissions from NPM on 19.8 kHz were obtained near its antipode in July 1963. The data are used to deduce attenuation rates at VLF. The results are presented as curves of attenuation rate of the dominant waveguide mode versus geomagnetic bearing of propagation path as measured at the transmitter. Results are given for both daytime and nighttime propagation and are considered applicable for sea water paths at temperate latitudes.